Your fixed commit message here

+ readme
+ some change in the bash script using ports

.gitattributes

@@ -0,0 +1,12 @@
+# Detect Markdown files
+*.md linguist-language=Markdown
+
+# Ignore CSS files for language detection
+*.css linguist-vendored
+
+# Some LF stuff so that linux works ; windows can fuck off
+* text=auto eol=lf
+*.png binary
+*.jpg binary
+*.gif binary
+*.zip binary

.gitignore

@@ -1,4 +1,5 @@
 __pycache__
 instance
 .venv
-*.sqlite3
+venv
+*.sqlite3

problem_loader.py

@@ -1,37 +0,0 @@
-import json
-import os
-import threading
-import time
-from models import db, Problem
-from flask import current_app
-
-def load_problems_from_json(json_path):
-    if not os.path.exists(json_path):
-        print(f"Problem JSON file not found: {json_path}")
-        return
-    with open(json_path, 'r') as f:
-        problems = json.load(f)
-    for p in problems:
-        # Check if problem already exists by title
-        existing = Problem.query.filter_by(title=p['title']).first()
-        # Load test code from solution file if provided
-        test_code = ''
-        if 'solution' in p and os.path.exists(p['solution']):
-            with open(p['solution'], 'r') as sf:
-                test_code = sf.read()
-        if existing:
-            existing.description = p['description']
-            existing.test_code = test_code
-        else:
-            new_problem = Problem(title=p['title'], description=p['description'], test_code=test_code)
-            db.session.add(new_problem)
-    db.session.commit()
-
-def schedule_problem_reload(app, json_path, interval_hours=10):
-    def reload_loop():
-        while True:
-            with app.app_context():
-                load_problems_from_json(json_path)
-            time.sleep(interval_hours * 3600)
-    t = threading.Thread(target=reload_loop, daemon=True)
-    t.start()

problems/sortlist/description.md

@@ -1 +0,0 @@
-this is a easy sorting problem **it is solvable in less than 2 seconds**

problems/sortlist/test.py

@@ -1,17 +0,0 @@
-import unittest
-
-# This is the function the user is expected to write.
-# Its a really simple one, the user can choose not to type tho.
-
-#def sortlist(lst = [4,3,2,1]) -> list:
-    #return sorted(lst)
-
-class TestSolution(unittest.TestCase):
-    def test_sort(self):
-        # define x as a empty array.
-        # this will be used for the functiun ; a empty var does not work.
-        self.x = []
-        self.assertEqual(sortlist(self.x), sorted(self.x)) # pyright: ignore[reportUndefinedVariable]
-
-if __name__ == "__main__":
-    unittest.main()

qtc.py

@@ -0,0 +1,902 @@
+import sys
+import json
+import os
+import logging
+from pathlib import Path
+from typing import Optional, Dict, Any, List, Tuple
+
+from PyQt6.QtWidgets import (
+    QApplication, QMainWindow, QWidget, QVBoxLayout, QHBoxLayout, QTabWidget,
+    QLabel, QLineEdit, QComboBox, QTextEdit, QPushButton, QStatusBar,
+    QMessageBox, QDialog, QListWidget, QSplitter, QFrame, QSizePolicy,
+    QScrollArea, QFileDialog, QToolTip
+)
+from PyQt6.QtCore import Qt, QSize, pyqtSignal, QTimer
+from PyQt6.QtGui import QFont, QTextOption, QSyntaxHighlighter, QTextCharFormat, QColor, QTextCursor, QKeyEvent, QTextDocument
+from PyQt6.QtWebEngineWidgets import QWebEngineView
+
+# Configure logging
+logging.basicConfig(level=logging.INFO, format='%(asctime)s - %(name)s - %(levelname)s - %(message)s')
+logger = logging.getLogger("ProblemCreator")
+
+# Optional imports with proper error handling
+OPTIONAL_DEPENDENCIES = {}
+
+try:
+    import markdown
+    OPTIONAL_DEPENDENCIES['markdown'] = True
+except ImportError:
+    logger.warning("Markdown library not available, using basic conversion")
+    OPTIONAL_DEPENDENCIES['markdown'] = False
+
+try:
+    from pygments import lex
+    from pygments.lexers import PythonLexer
+    from pygments.styles import get_style_by_name
+    OPTIONAL_DEPENDENCIES['pygments'] = True
+except ImportError:
+    logger.warning("Pygments not available, syntax highlighting will be disabled")
+    OPTIONAL_DEPENDENCIES['pygments'] = False
+
+
+class CodeEditor(QTextEdit):
+    """A code editor with syntax highlighting and advanced auto-indentation."""
+    
+    def __init__(self, parent=None):
+        super().__init__(parent)
+        self.setFont(QFont("Consolas", 10))
+        self.indent_width = 4
+        self.setTabStopDistance(QFont("Consolas", 10).pointSize() * self.indent_width)
+        
+        # Setup syntax highlighting if available
+        if OPTIONAL_DEPENDENCIES.get('pygments', False):
+            self.highlighter = PythonHighlighter(self.document())
+        
+        # Tips for test case editing
+        self.tips = [
+            "💡 Tip: Use descriptive test method names like test_empty_input()",
+            "💡 Tip: Test edge cases like empty inputs, large inputs, and invalid inputs",
+            "💡 Tip: Use assertEqual for exact matches, assertTrue/False for boolean checks",
+            "💡 Tip: Test both valid and invalid inputs to ensure robustness",
+            "💡 Tip: Consider using setUp() method for common test setup",
+            "💡 Tip: Use parameterized tests if you have many similar test cases",
+            "💡 Tip: Make sure your tests are independent of each other",
+            "💡 Tip: Test not only for correct outputs but also for proper error handling"
+        ]
+        self.current_tip_index = 0
+        self.tip_timer = QTimer(self)
+        self.tip_timer.timeout.connect(self.show_next_tip)
+        self.tip_timer.start(10000)  # Show a new tip every 10 seconds
+    
+    def show_next_tip(self):
+        """Show the next tip in the status bar."""
+        if self.parent() and hasattr(self.parent().parent().parent().parent(), 'statusBar'):
+            status_bar = self.parent().parent().parent().parent().statusBar()
+            if status_bar:
+                tip = self.tips[self.current_tip_index]
+                status_bar.showMessage(tip)
+                self.current_tip_index = (self.current_tip_index + 1) % len(self.tips)
+    
+    def keyPressEvent(self, event: QKeyEvent):
+        """Handle key press events for auto-indentation and pairing."""
+        key = event.key()
+        modifiers = event.modifiers()
+        cursor = self.textCursor()
+        
+        # Tab key
+        if key == Qt.Key.Key_Tab:
+            if cursor.hasSelection():
+                self.indentSelection()
+            else:
+                # Insert spaces
+                cursor.insertText(" " * self.indent_width)
+            return
+        
+        # Shift+Tab key
+        elif key == Qt.Key.Key_Backtab:
+            if cursor.hasSelection():
+                self.dedentSelection()
+            else:
+                self.dedentLine()
+            return
+        
+        # Return key
+        elif key == Qt.Key.Key_Return:
+            # Get current line
+            cursor.movePosition(QTextCursor.MoveOperation.StartOfLine)
+            cursor.movePosition(QTextCursor.MoveOperation.EndOfLine, QTextCursor.MoveMode.KeepAnchor)
+            line_text = cursor.selectedText()
+            
+            # Calculate indentation
+            indent = len(line_text) - len(line_text.lstrip())
+            
+            # Check if line ends with colon
+            ends_with_colon = line_text.rstrip().endswith(':')
+            
+            # Insert newline with indentation
+            cursor = self.textCursor()
+            cursor.insertText("\n" + " " * indent)
+            
+            # Add extra indentation if line ended with colon
+            if ends_with_colon:
+                cursor.insertText(" " * self.indent_width)
+            return
+        
+        # Auto-pairing
+        elif key == Qt.Key.Key_ParenLeft:
+            cursor.insertText("()")
+            cursor.movePosition(QTextCursor.MoveOperation.Left)
+            self.setTextCursor(cursor)
+            return
+        elif key == Qt.Key.Key_BracketLeft:
+            cursor.insertText("[]")
+            cursor.movePosition(QTextCursor.MoveOperation.Left)
+            self.setTextCursor(cursor)
+            return
+        elif key == Qt.Key.Key_BraceLeft:
+            cursor.insertText("{}")
+            cursor.movePosition(QTextCursor.MoveOperation.Left)
+            self.setTextCursor(cursor)
+            return
+        elif key == Qt.Key.Key_QuoteDbl:
+            cursor.insertText('""')
+            cursor.movePosition(QTextCursor.MoveOperation.Left)
+            self.setTextCursor(cursor)
+            return
+        elif key == Qt.Key.Key_Apostrophe:
+            cursor.insertText("''")
+            cursor.movePosition(QTextCursor.MoveOperation.Left)
+            self.setTextCursor(cursor)
+            return
+        elif key == Qt.Key.Key_Colon and modifiers == Qt.KeyboardModifier.NoModifier:
+            # Check if we're at the end of the line
+            cursor.movePosition(QTextCursor.MoveOperation.EndOfLine)
+            if self.textCursor().position() == cursor.position():
+                cursor.insertText(":")
+                return
+        
+        # Default behavior
+        super().keyPressEvent(event)
+    
+    def indentSelection(self):
+        """Indent all selected lines."""
+        cursor = self.textCursor()
+        start = cursor.selectionStart()
+        end = cursor.selectionEnd()
+        
+        # Move to start of selection
+        cursor.setPosition(start)
+        cursor.movePosition(QTextCursor.MoveOperation.StartOfLine)
+        
+        # Indent each line in selection
+        while cursor.position() <= end:
+            cursor.insertText(" " * self.indent_width)
+            end += self.indent_width
+            if not cursor.movePosition(QTextCursor.MoveOperation.Down):
+                break
+        
+        # Restore selection
+        cursor.setPosition(start)
+        cursor.setPosition(end, QTextCursor.MoveMode.KeepAnchor)
+        self.setTextCursor(cursor)
+    
+    def dedentSelection(self):
+        """Dedent all selected lines."""
+        cursor = self.textCursor()
+        start = cursor.selectionStart()
+        end = cursor.selectionEnd()
+        
+        # Move to start of selection
+        cursor.setPosition(start)
+        cursor.movePosition(QTextCursor.MoveOperation.StartOfLine)
+        
+        # Dedent each line in selection
+        while cursor.position() <= end:
+            # Check for spaces at beginning of line
+            line_start = cursor.position()
+            cursor.movePosition(QTextCursor.MoveOperation.EndOfLine, QTextCursor.MoveMode.KeepAnchor)
+            line_text = cursor.selectedText()
+            
+            # Count leading spaces
+            leading_spaces = min(len(line_text) - len(line_text.lstrip()), self.indent_width)
+            
+            if leading_spaces > 0:
+                # Remove leading spaces
+                cursor.setPosition(line_start)
+                cursor.movePosition(QTextCursor.MoveOperation.Right, QTextCursor.MoveMode.KeepAnchor, leading_spaces)
+                cursor.removeSelectedText()
+                end -= leading_spaces
+            
+            if not cursor.movePosition(QTextCursor.MoveOperation.Down):
+                break
+        
+        # Restore selection
+        cursor.setPosition(max(0, start - self.indent_width))
+        cursor.setPosition(max(0, end - self.indent_width), QTextCursor.MoveMode.KeepAnchor)
+        self.setTextCursor(cursor)
+    
+    def dedentLine(self):
+        """Dedent the current line."""
+        cursor = self.textCursor()
+        cursor.movePosition(QTextCursor.MoveOperation.StartOfLine)
+        
+        # Check for spaces at beginning of line
+        line_start = cursor.position()
+        cursor.movePosition(QTextCursor.MoveOperation.EndOfLine, QTextCursor.MoveMode.KeepAnchor)
+        line_text = cursor.selectedText()
+        
+        # Count leading spaces
+        leading_spaces = min(len(line_text) - len(line_text.lstrip()), self.indent_width)
+        
+        if leading_spaces > 0:
+            # Remove leading spaces
+            cursor.setPosition(line_start)
+            cursor.movePosition(QTextCursor.MoveOperation.Right, QTextCursor.MoveMode.KeepAnchor, leading_spaces)
+            cursor.removeSelectedText()
+
+
+class PythonHighlighter(QSyntaxHighlighter):
+    """Syntax highlighter for Python code using Pygments."""
+    
+    def __init__(self, document):
+        super().__init__(document)
+        self._setup_formats()
+    
+    def _setup_formats(self):
+        """Setup text formats for different token types."""
+        self.formats = {}
+        
+        # Define syntax highlighting formats
+        keyword_format = QTextCharFormat()
+        keyword_format.setForeground(QColor("#0000FF"))
+        keyword_format.setFontWeight(QFont.Weight.Bold)
+        self.formats['keyword'] = keyword_format
+        
+        string_format = QTextCharFormat()
+        string_format.setForeground(QColor("#008000"))
+        self.formats['string'] = string_format
+        
+        comment_format = QTextCharFormat()
+        comment_format.setForeground(QColor("#808080"))
+        comment_format.setFontItalic(True)
+        self.formats['comment'] = comment_format
+        
+        function_format = QTextCharFormat()
+        function_format.setForeground(QColor("#000080"))
+        function_format.setFontWeight(QFont.Weight.Bold)
+        self.formats['function'] = function_format
+        
+        number_format = QTextCharFormat()
+        number_format.setForeground(QColor("#FF8C00"))
+        self.formats['number'] = number_format
+        
+        # Python keywords
+        self.keywords = [
+            'and', 'as', 'assert', 'break', 'class', 'continue', 'def', 'del',
+            'elif', 'else', 'except', 'False', 'finally', 'for', 'from', 'global',
+            'if', 'import', 'in', 'is', 'lambda', 'None', 'nonlocal', 'not', 'or',
+            'pass', 'raise', 'return', 'True', 'try', 'while', 'with', 'yield'
+        ]
+        
+        # unittest keywords
+        self.unittest_keywords = [
+            'TestCase', 'setUp', 'tearDown', 'setUpClass', 'tearDownClass',
+            'assertEqual', 'assertTrue', 'assertFalse', 'assertRaises',
+            'assertAlmostEqual', 'assertNotEqual', 'assertIn', 'assertNotIn',
+            'assertIs', 'assertIsNot', 'assertIsNone', 'assertIsNotNone',
+            'assertIsInstance', 'assertNotIsInstance', 'assertDictEqual',
+            'assertListEqual', 'assertTupleEqual', 'assertSetEqual',
+            'assertSequenceEqual', 'assertMultiLineEqual', 'assertGreater',
+            'assertGreaterEqual', 'assertLess', 'assertLessEqual', 'assertRegex',
+            'assertNotRegex', 'assertCountEqual'
+        ]
+    
+    def highlightBlock(self, text):
+        """Apply syntax highlighting to the current text block."""
+        # Check if we should use pygments
+        if OPTIONAL_DEPENDENCIES.get('pygments', False):
+            self._highlight_with_pygments(text)
+        else:
+            self._highlight_with_basic_rules(text)
+    
+    def _highlight_with_pygments(self, text):
+        """Use pygments for syntax highlighting if available."""
+        try:
+            # Get the text from the current block
+            block = self.currentBlock()
+            start_pos = block.position()
+            end_pos = start_pos + len(text)
+            full_text = self.document().toPlainText()
+            
+            # Lex the code and apply formats
+            for token, value in lex(full_text, PythonLexer()):
+                token_str = str(token)
+                token_start = full_text.find(value, start_pos)
+                
+                # Skip if token is not in current block
+                if token_start < start_pos or token_start >= end_pos:
+                    continue
+                
+                # Calculate length within current block
+                token_len = min(len(value), end_pos - token_start)
+                
+                # Apply appropriate format
+                if 'Keyword' in token_str:
+                    self.setFormat(token_start - start_pos, token_len, self.formats['keyword'])
+                elif 'String' in token_str:
+                    self.setFormat(token_start - start_pos, token_len, self.formats['string'])
+                elif 'Comment' in token_str:
+                    self.setFormat(token_start - start_pos, token_len, self.formats['comment'])
+                elif 'Name' in token_str and 'Function' in token_str:
+                    self.setFormat(token_start - start_pos, token_len, self.formats['function'])
+                elif 'Number' in token_str:
+                    self.setFormat(token_start - start_pos, token_len, self.formats['number'])
+                    
+        except Exception as e:
+            logger.error(f"Error during pygments highlighting: {e}")
+            # Fall back to basic highlighting
+            self._highlight_with_basic_rules(text)
+    
+    def _highlight_with_basic_rules(self, text):
+        """Use basic rules for syntax highlighting."""
+        # Highlight keywords
+        for keyword in self.keywords + self.unittest_keywords:
+            pattern = r'\b' + keyword + r'\b'
+            index = 0
+            while index < len(text):
+                index = text.find(keyword, index)
+                if index == -1:
+                    break
+                
+                # Check if it's really a word (not part of another word)
+                if (index == 0 or not text[index-1].isalnum()) and \
+                   (index + len(keyword) >= len(text) or not text[index + len(keyword)].isalnum()):
+                    if keyword in self.keywords:
+                        self.setFormat(index, len(keyword), self.formats['keyword'])
+                    else:
+                        self.setFormat(index, len(keyword), self.formats['function'])
+                
+                index += len(keyword)
+        
+        # Highlight strings
+        import re
+        string_pattern = re.compile(r'(\".*?\")|(\'.*?\')')
+        for match in string_pattern.finditer(text):
+            start, end = match.span()
+            self.setFormat(start, end - start, self.formats['string'])
+        
+        # Highlight comments
+        comment_pattern = re.compile(r'#.*')
+        for match in comment_pattern.finditer(text):
+            start, end = match.span()
+            self.setFormat(start, end - start, self.formats['comment'])
+        
+        # Highlight numbers
+        number_pattern = re.compile(r'\b\d+\b')
+        for match in number_pattern.finditer(text):
+            start, end = match.span()
+            self.setFormat(start, end - start, self.formats['number'])
+
+
+class MarkdownEditor(QWidget):
+    """A markdown editor with live preview."""
+    
+    def __init__(self, parent=None):
+        super().__init__(parent)
+        
+        # Create split view
+        self.splitter = QSplitter(Qt.Orientation.Horizontal)
+        layout = QVBoxLayout(self)
+        layout.addWidget(self.splitter)
+        
+        # Left side - text editor
+        self.editor = QTextEdit()
+        self.editor.setFont(QFont("Consolas", 10))
+        self.editor.textChanged.connect(self.update_preview)
+        self.splitter.addWidget(self.editor)
+        
+        # Right side - preview
+        self.preview = QWebEngineView()
+        self.splitter.addWidget(self.preview)
+        
+        # Set initial sizes
+        self.splitter.setSizes([400, 400])
+    
+    def update_preview(self):
+        """Update the markdown preview."""
+        # Get the markdown text
+        markdown_text = self.editor.toPlainText()
+        
+        # Convert to HTML
+        html_content = self._markdown_to_html(markdown_text)
+        
+        # Update the preview
+        self.preview.setHtml(html_content)
+    
+    def _markdown_to_html(self, text):
+        """Convert markdown text to HTML."""
+        if OPTIONAL_DEPENDENCIES.get('markdown', False):
+            # Use the markdown library if available
+            html = markdown.markdown(text)
+        else:
+            # Fallback to basic conversion
+            html = text
+            html = html.replace("# ", "<h1>").replace("\n# ", "</h1>\n<h1>") + "</h1>"
+            html = html.replace("## ", "<h2>").replace("\n## ", "</h2>\n<h2>") + "</h2>"
+            html = html.replace("### ", "<h3>").replace("\n### ", "</h3>\n<h3>") + "</h3>"
+            html = html.replace("**", "<strong>").replace("**", "</strong>")
+            html = html.replace("*", "<em>").replace("*", "</em>")
+            html = html.replace("`", "<code>").replace("`", "</code>")
+            html = html.replace("\n", "<br>")
+        
+        # Wrap in proper HTML structure
+        return f"""
+        <html>
+        <head>
+            <style>
+                body {{ 
+                    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 
+                    Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif; 
+                    padding: 20px; 
+                    line-height: 1.6;
+                    color: #333;
+                }}
+                code {{ 
+                    background-color: #f6f8fa; 
+                    padding: 2px 6px; 
+                    border-radius: 4px; 
+                    font-family: 'Consolas', monospace;
+                }}
+                pre {{ 
+                    background-color: #f6f8fa; 
+                    padding: 12px; 
+                    border-radius: 6px; 
+                    overflow: auto;
+                }}
+                pre code {{
+                    background: none;
+                    padding: 0;
+                }}
+                blockquote {{
+                    border-left: 4px solid #ddd;
+                    margin-left: 0;
+                    padding-left: 16px;
+                    color: #666;
+                }}
+            </style>
+        </head>
+        <body>
+            {html}
+        </body>
+        </html>
+        """
+    
+    def setPlainText(self, text):
+        """Set the editor text."""
+        self.editor.setPlainText(text)
+    
+    def toPlainText(self):
+        """Get the editor text."""
+        return self.editor.toPlainText()
+
+
+class LoadProblemDialog(QDialog):
+    """Dialog for loading existing problems."""
+    
+    def __init__(self, problems, parent=None):
+        super().__init__(parent)
+        self.setWindowTitle("Load Existing Problem")
+        self.setModal(True)
+        self.setMinimumSize(400, 300)
+        
+        layout = QVBoxLayout(self)
+        
+        label = QLabel("Select a problem to load:")
+        label.setFont(QFont("Arial", 10, QFont.Weight.Bold))
+        layout.addWidget(label)
+        
+        self.list_widget = QListWidget()
+        self.list_widget.addItems(sorted(problems))
+        layout.addWidget(self.list_widget)
+        
+        button_layout = QHBoxLayout()
+        self.load_button = QPushButton("Load")
+        self.load_button.clicked.connect(self.accept)
+        button_layout.addWidget(self.load_button)
+        
+        self.cancel_button = QPushButton("Cancel")
+        self.cancel_button.clicked.connect(self.reject)
+        button_layout.addWidget(self.cancel_button)
+        
+        layout.addLayout(button_layout)
+    
+    def selected_problem(self):
+        """Get the selected problem name."""
+        items = self.list_widget.selectedItems()
+        return items[0].text() if items else None
+
+
+class ProblemCreatorApp(QMainWindow):
+    """Main application for creating coding problems."""
+    
+    def __init__(self):
+        super().__init__()
+        self.setWindowTitle("Coding Problem Creator")
+        self.setGeometry(100, 100, 1200, 900)
+        
+        # Set default paths
+        self.base_path = Path("src/problems")
+        
+        # Initialize UI
+        self.create_widgets()
+        self.statusBar().showMessage("Ready to create a new problem...")
+    
+    def create_widgets(self):
+        """Create all UI widgets."""
+        # Central widget
+        central_widget = QWidget()
+        self.setCentralWidget(central_widget)
+        
+        # Main layout
+        main_layout = QVBoxLayout(central_widget)
+        
+        # Create tab widget
+        self.tab_widget = QTabWidget()
+        main_layout.addWidget(self.tab_widget)
+        
+        # Problem Info tab
+        self.info_tab = QWidget()
+        self.tab_widget.addTab(self.info_tab, "Problem Info")
+        self.create_info_tab()
+        
+        # Markdown Description tab
+        self.markdown_tab = QWidget()
+        self.tab_widget.addTab(self.markdown_tab, "Markdown Description")
+        self.create_markdown_tab()
+        
+        # Test Code tab
+        self.test_tab = QWidget()
+        self.tab_widget.addTab(self.test_tab, "Test Code")
+        self.create_test_tab()
+        
+        # Buttons at the bottom
+        button_layout = QHBoxLayout()
+        
+        self.create_button = QPushButton("Create Problem")
+        self.create_button.clicked.connect(self.create_problem)
+        button_layout.addWidget(self.create_button)
+        
+        self.clear_button = QPushButton("Clear All")
+        self.clear_button.clicked.connect(self.clear_all)
+        button_layout.addWidget(self.clear_button)
+        
+        self.load_button = QPushButton("Load Existing")
+        self.load_button.clicked.connect(self.load_existing)
+        button_layout.addWidget(self.load_button)
+        
+        main_layout.addLayout(button_layout)
+    
+    def create_info_tab(self):
+        """Create the Problem Info tab."""
+        layout = QVBoxLayout(self.info_tab)
+        
+        # Title
+        title_label = QLabel("Coding Problem Creator")
+        title_font = QFont("Arial", 16, QFont.Weight.Bold)
+        title_label.setFont(title_font)
+        layout.addWidget(title_label)
+        
+        # Problem Name
+        name_layout = QHBoxLayout()
+        name_label = QLabel("Problem Name:")
+        name_label.setFont(QFont("Arial", 10, QFont.Weight.Bold))
+        name_layout.addWidget(name_label)
+        
+        self.problem_name = QLineEdit()
+        self.problem_name.setFont(QFont("Arial", 10))
+        name_layout.addWidget(self.problem_name)
+        layout.addLayout(name_layout)
+        
+        # Difficulty
+        difficulty_layout = QHBoxLayout()
+        difficulty_label = QLabel("Difficulty:")
+        difficulty_label.setFont(QFont("Arial", 10, QFont.Weight.Bold))
+        difficulty_layout.addWidget(difficulty_label)
+        
+        self.difficulty = QComboBox()
+        self.difficulty.addItems(["easy", "medium", "hard"])
+        self.difficulty.setCurrentText("medium")
+        difficulty_layout.addWidget(self.difficulty)
+        difficulty_layout.addStretch()
+        layout.addLayout(difficulty_layout)
+        
+        # Plain Text Description
+        desc_label = QLabel("Plain Text Description:")
+        desc_label.setFont(QFont("Arial", 10, QFont.Weight.Bold))
+        layout.addWidget(desc_label)
+        
+        self.description_text = QTextEdit()
+        self.description_text.setFont(QFont("Arial", 10))
+        self.description_text.setAcceptRichText(False)
+        layout.addWidget(self.description_text)
+    
+    def create_markdown_tab(self):
+        """Create the Markdown Description tab."""
+        layout = QVBoxLayout(self.markdown_tab)
+        self.description_editor = MarkdownEditor()
+        layout.addWidget(self.description_editor)
+    
+    def create_test_tab(self):
+        """Create the Test Code tab."""
+        layout = QVBoxLayout(self.test_tab)
+        
+        # Add tips label
+        tips_label = QLabel("💡 Tips for writing good test cases will appear in the status bar")
+        tips_label.setFont(QFont("Arial", 9))
+        tips_label.setStyleSheet("color: #666; padding: 5px;")
+        layout.addWidget(tips_label)
+        
+        self.test_code_editor = CodeEditor()
+        layout.addWidget(self.test_code_editor)
+        
+        # Insert template code
+        self._insert_template_code()
+    
+    def _insert_template_code(self):
+        """Insert template test code into the editor."""
+        template_code = '''import unittest
+
+class TestSolution(unittest.TestCase):
+    def test_example_case(self):
+        """
+        Test the provided example case.
+        """
+        solution = Solution()
+        result = solution.solve("input")
+        self.assertEqual(result, "expected_output")
+    
+    def test_edge_case_empty_input(self):
+        """
+        Test with empty input.
+        """
+        solution = Solution()
+        result = solution.solve("")
+        self.assertEqual(result, "")
+    
+    def test_edge_case_large_input(self):
+        """
+        Test with a large input to check performance.
+        """
+        solution = Solution()
+        large_input = "a" * 1000
+        result = solution.solve(large_input)
+        self.assertTrue(result)  # Adjust based on expected behavior
+
+if __name__ == "__main__":
+    unittest.main()
+'''
+        self.test_code_editor.setPlainText(template_code)
+    
+    def validate_inputs(self):
+        """Validate all form inputs."""
+        if not self.problem_name.text().strip():
+            QMessageBox.critical(self, "Error", "Problem name is required!")
+            return False
+        
+        if not self.description_text.toPlainText().strip():
+            QMessageBox.critical(self, "Error", "Plain text description is required!")
+            return False
+        
+        if not self.description_editor.toPlainText().strip():
+            QMessageBox.critical(self, "Error", "Markdown description is required!")
+            return False
+        
+        test_code = self.test_code_editor.toPlainText().strip()
+        if not test_code or "pass" in test_code and len(test_code) < 100:
+            reply = QMessageBox.question(
+                self, 
+                "Confirm", 
+                "The test code seems minimal. Are you sure you want to proceed?",
+                QMessageBox.StandardButton.Yes | QMessageBox.StandardButton.No
+            )
+            if reply == QMessageBox.StandardButton.No:
+                return False
+        
+        # Validate problem name (should be filesystem-safe)
+        name = self.problem_name.text().strip()
+        if not name.replace("_", "").replace("-", "").replace(" ", "").isalnum():
+            QMessageBox.critical(
+                self, 
+                "Error", 
+                "Problem name should only contain letters, numbers, spaces, hyphens, and underscores!"
+            )
+            return False
+        
+        return True
+    
+    def create_problem(self):
+        """Create a new problem from the form data."""
+        if not self.validate_inputs():
+            return
+        
+        try:
+            # Get values
+            problem_name = self.problem_name.text().strip()
+            description_text = self.description_text.toPlainText().strip()  # Plain text
+            description_md = self.description_editor.toPlainText().strip()  # Markdown
+            difficulty = self.difficulty.currentText()
+            test_code = self.test_code_editor.toPlainText().strip()
+            
+            # Create safe folder name (replace spaces with underscores)
+            folder_name = problem_name.replace(" ", "_").lower()
+            
+            # Create directory structure
+            problem_path = self.base_path / folder_name
+            
+            # Create directories if they don't exist
+            problem_path.mkdir(parents=True, exist_ok=True)
+            
+            # Create manifest.json - Include both description fields
+            manifest = {
+                "title": problem_name,
+                "description": description_text,  # Plain text description
+                "description_md": f"problems/{folder_name}/description.md",  # Markdown file path
+                "test_code": f"problems/{folder_name}/test.py",
+                "difficulty": difficulty
+            }
+            
+            manifest_path = problem_path / "manifest.json"
+            with open(manifest_path, 'w', encoding='utf-8') as f:
+                json.dump(manifest, f, indent=4, ensure_ascii=False)
+            
+            # Create description.md
+            description_md_path = problem_path / "description.md"
+            with open(description_md_path, 'w', encoding='utf-8') as f:
+                f.write(description_md)
+            
+            # Create test.py
+            test_py_path = problem_path / "test.py"
+            with open(test_py_path, 'w', encoding='utf-8') as f:
+                f.write(test_code)
+            
+            self.statusBar().showMessage(f"✓ Problem '{problem_name}' created successfully in {problem_path}")
+            logger.info(f"Created problem: {problem_name} at {problem_path}")
+            
+            reply = QMessageBox.question(
+                self,
+                "Success", 
+                f"Problem '{problem_name}' created successfully!\n\n"
+                f"Location: {problem_path}\n\n"
+                "Would you like to open the folder?",
+                QMessageBox.StandardButton.Yes | QMessageBox.StandardButton.No
+            )
+            
+            if reply == QMessageBox.StandardButton.Yes:
+                self.open_folder(problem_path)
+                
+        except Exception as e:
+            error_msg = f"Error creating problem: {str(e)}"
+            self.statusBar().showMessage(error_msg)
+            logger.error(error_msg)
+            QMessageBox.critical(self, "Error", error_msg)
+    
+    def open_folder(self, path):
+        """Cross-platform folder opening."""
+        try:
+            if sys.platform == "win32":
+                os.startfile(path)
+            elif sys.platform == "darwin":  # macOS
+                os.system(f"open '{path}'")
+            else:  # Linux and other Unix-like
+                os.system(f"xdg-open '{path}'")
+        except Exception as e:
+            error_msg = f"Could not open folder: {str(e)}"
+            logger.warning(error_msg)
+            QMessageBox.warning(self, "Warning", error_msg)
+    
+    def clear_all(self):
+        """Clear all form fields."""
+        reply = QMessageBox.question(
+            self, 
+            "Confirm", 
+            "Clear all fields?",
+            QMessageBox.StandardButton.Yes | QMessageBox.StandardButton.No
+        )
+        
+        if reply == QMessageBox.StandardButton.Yes:
+            self.problem_name.clear()
+            self.description_text.clear()
+            self.description_editor.setPlainText("")
+            self.difficulty.setCurrentText("medium")
+            self.test_code_editor.clear()
+            
+            # Re-insert template
+            self._insert_template_code()
+            
+            self.statusBar().showMessage("All fields cleared.")
+            logger.info("Cleared all form fields")
+    
+    def load_existing(self):
+        """Load an existing problem for editing."""
+        try:
+            if not self.base_path.exists():
+                QMessageBox.warning(self, "Warning", "No problems directory found!")
+                return
+            
+            # Get list of existing problems
+            problems = [d.name for d in self.base_path.iterdir() if d.is_dir()]
+            
+            if not problems:
+                QMessageBox.information(self, "Info", "No existing problems found!")
+                return
+            
+            # Create and show selection dialog
+            dialog = LoadProblemDialog(problems, self)
+            if dialog.exec() == QDialog.DialogCode.Accepted:
+                selected_problem = dialog.selected_problem()
+                if selected_problem:
+                    self.load_problem_data(selected_problem)
+            
+        except Exception as e:
+            error_msg = f"Error loading existing problems: {str(e)}"
+            logger.error(error_msg)
+            QMessageBox.critical(self, "Error", error_msg)
+    
+    def load_problem_data(self, problem_name):
+        """Load problem data into the form."""
+        try:
+            problem_path = self.base_path / problem_name
+            manifest_path = problem_path / "manifest.json"
+            test_path = problem_path / "test.py"
+            desc_path = problem_path / "description.md"
+            
+            # Load manifest
+            with open(manifest_path, 'r', encoding='utf-8') as f:
+                manifest = json.load(f)
+            
+            # Load test code
+            test_code = ""
+            if test_path.exists():
+                with open(test_path, 'r', encoding='utf-8') as f:
+                    test_code = f.read()
+            
+            # Load markdown description
+            description_md = ""
+            if desc_path.exists():
+                with open(desc_path, 'r', encoding='utf-8') as f:
+                    description_md = f.read()
+            
+            # Load plain text description from manifest
+            description_text = manifest.get('description', '')
+            
+            # Populate fields
+            self.problem_name.setText(manifest["title"])
+            self.description_text.setPlainText(description_text)
+            self.description_editor.setPlainText(description_md)
+            self.difficulty.setCurrentText(manifest["difficulty"])
+            self.test_code_editor.setPlainText(test_code)
+            
+            self.statusBar().showMessage(f"Loaded problem: {problem_name}")
+            logger.info(f"Loaded problem: {problem_name}")
+            
+        except Exception as e:
+            error_msg = f"Error loading problem data: {str(e)}"
+            logger.error(error_msg)
+            QMessageBox.critical(self, "Error", error_msg)
+
+
+def main():
+    """Main application entry point."""
+    app = QApplication(sys.argv)
+    
+    # Set application style
+    app.setStyle('Fusion')
+    
+    window = ProblemCreatorApp()
+    window.show()
+    
+    sys.exit(app.exec())
+
+
+if __name__ == "__main__":
+    main()

readme.md

@@ -1,25 +1,174 @@
-## under construction
+# QPP - Quick Problem Platfrom
 
-### Like LeetCode
+This is a lightweight, LeetCode-inspired problem-solving platform. You can run the server locally, contribute problems, and write unit tests.
 
-but more lightweight
+---
 
-if you want to contribute write tests like this:
+## Getting Started
+
+Run the provided bash/_batch_ script to start the server.
+
+---
+
+## File Structure for Problems
+
+Create a folder inside `/problems/` named after your problem. Each folder **must** contain:
+
+* `manifest.json` # Dont worry you can change the info anytime to reload
+* `test.py`
+* `description.md`
+
+**Example `manifest.json`:**
+
+```json
+{
+    "title": "Title of the Problem",
+    "description": "Write a very short description here",
+    "description_md": "problems/problempath/description.md",
+    "difficulty": "easy || medium || hard",
+    "test_code": "problems/problempath/test.py"
+}
+```
+
+> This structure is mandatory but ensures the easiest workflow.
+
+---
+
+## Writing Problem Descriptions
+
+* Use **simple and easy-to-understand language**. Avoid overly technical explanations.
+* Syntax:
+
+  * Normal Markdown
+  * Start headings with `##` (looks cleaner than `#`)
+  * Include cross-links to resources, e.g., [W3Schools](https://www.w3schools.com/) or [Python Docs](https://docs.python.org/3/)
+* Good formatting is always appreciated
+
+---
+
+## Developing & Running Locally
+
+To run the backend during development:
+
+```bash
+python -m flask --app ./src/app.py --host=0.0.0.0 --port=5000
+```
+
+For production testing:
+
+**Linux:**
+
+```bash
+python -m gunicorn -w 4 -b 0.0.0.0:8000 src.app:app
+```
+
+**Windows:**
+
+```bat
+:: Create database folder if missing
+md .\src\database
+python -m waitress --listen=0.0.0.0:8000 src.app:app 
+```
+
+> Ensure all required packages are installed via `requirements.txt`. Python is versatile enough for this small backend.
+
+---
+
+### Migrating Legacy Code
+
+When removing or refactoring legacy code:
+
+1. Check if the code is used anywhere; if critical, branch into a testing branch first.
+2. Ensure essential functionality is preserved.
+
+---
+
+## Committing Changes
+
+**WE NEED FRONTED PEOPLE!!**, I have no Idea how that works, please someone ( if they are interested help )
+
+* Ensure your editor uses **LF** line endings (`\n`) instead of CRLF.
+* To automatically fix CRLF on commit:
+
+```bash
+git config core.autocrlf input
+git add --renormalize .
+git commit -m "Major Change"
+```
+
+* Recommended workflow:
+
+  1. Fork
+  2. Make changes
+  3. Submit a PR
+  4. Review & merge
+
+> Using WSL with VS Code for development is recommended for consistent line endings on Windows.
+
+---
+
+## Writing Unit Tests
+
+Follow this convention when writing unittests. **Implement the function first, then write tests.**
+
+### Example: Phone Number Validation
+
+**Function (`phone_validation.py`):**
+
+```python
+import re
+
+def is_valid_phone_number(phone_number: str) -> bool:
+    """Return True if phone_number matches '123-456-7890' format."""
+    return bool(re.search(r"^(\d{3}-){2}\d{4}$", phone_number))
+```
+
+**Unit Test (`test_phone_validation.py`):**
 
 ```python
 import unittest
+from phone_validation import is_valid_phone_number
 
-#<!-- The Function the User needs to write -->
-def revstring(x):
-    return x[::-1]
+class TestPhoneNumberRegex(unittest.TestCase):
 
-#<!-- This Test, test if the function works -->
-class TestSolution(unittest.TestCase):
-    def test_simple(self):
-        # !! This needs to be dynamic ; if the user enters some shit then it is supposed to work too
-        x="";
-        self.assertEqual(revstring(x), x[::-1]) 
+    def test_if_valid(self):
+        test_cases = [
+            ("123-456-7890", True),
+            ("111-222-3333", True),
+            ("abc-def-ghij", False),
+            ("1234567890", False),
+            ("123-45-67890", False),
+            ("12-3456-7890", False),
+            ("", False),
+        ]
+        print("\nPHONE NUMBER VALIDATION TEST RESULTS")
+
+        for phone, expected in test_cases:
+            try:
+                actual = is_valid_phone_number(phone)
+                status = "✓ PASS" if actual == expected else "✗ FAIL"
+                print(f"{status} | Input: '{phone}' -> Got: {actual} | Expected: {expected}")
+                self.assertEqual(actual, expected)
+            except Exception as e:
+                print(f"✗ ERROR | Input: '{phone}' -> Exception: {e}")
+                raise
 
 if __name__ == "__main__":
-    unittest.main()
-```
+    unittest.main(verbosity=2)
+```
+
+### ✅ Unit Test Guidelines
+
+1. **Class Naming:** `Test<FunctionOrModuleName>`
+2. **Method Naming:** `test_<what_is_being_tested>`
+3. **Use tuples** `(input, expected_output)` for test cases
+4. Include **edge cases** (empty strings, wrong formats)
+5. **Print results** clearly for easier debugging
+6. **Catch exceptions** and display failing input before raising
+
+
+### What has changed for ease of use:
+
+If you want to really easily create or edit programs then you should look at the Qt Programm.
+It basically acts as a "VsCode" of this platform. After editing / creating i would suggest you look over everything in a serious
+editor. Its still realtively new.

requirements.txt

@@ -0,0 +1,11 @@
+Flask>=3.0
+Flask-SQLAlchemy>=3.1
+Flask-Caching>=2.3.1
+Markdown>=3.6
+MarkupSafe>=2.1
+watchdog>=4.0
+gunicorn>=23.0.0
+waitress>=3.0.2
+pygments>=2.19.2
+pyqt6>=6.9.1
+PyQt6-WebEngine>=6.9.0

run.bash

@@ -0,0 +1,25 @@
+#!/bin/bash
+
+set -e  # exit if any command fails
+
+# Ensure src/database directory exists
+mkdir -p src/database
+
+# Create virtual environment if it doesn't exist
+if [ ! -d "venv" ]; then
+    python -m venv venv
+fi
+source venv/bin/activate
+
+# Upgrade pip and install dependencies
+pip install --upgrade pip
+pip install -r requirements.txt
+
+# Export environment variables
+export FLASK_APP=src.app
+export FLASK_ENV=production
+
+# Run with Gunicorn
+echo "Starting Flask app with Gunicorn..."
+exec gunicorn -w 4 -b 0.0.0.0:8000 src.app:app
+

run.bat

@@ -0,0 +1,3 @@
+:: make db directory and then launch the server
+md .\src\database
+python -m waitress --listen=0.0.0.0:8000 src.app:app

src/JavaScript/script.js

@@ -0,0 +1,731 @@
+/**
+ * -------------------------------------------------------------------
+ * Please read as a Developer:
+ * @file script.js
+ * @author rattatwinko
+ * @description "This is the JavaScript "frontend" File for the website.
+ *               This handleds nearly every frontend logic / interaction
+ *               if you want to change this, then you should be cautious.
+ *               This is a complete mess. And its too complex to refactor.
+ *               Atleast for me.
+ * @license MIT
+ * You can freely modify this file and distribute it as you wish.
+ * 
+ * @todo
+ *  - [] Refactor the jeriatric piece of shit code.
+ * ------------------------------------------------------------------
+ * This is the stupid fucking JavaScript, i hate this so fucking much
+ * why the fuck does this need to exsits, idk. 
+ * 
+ * CHANGELOG:
+ *  aug18@21:51-> pagination for leaderboard ; and some shit refactoring.
+ */
+document.addEventListener("DOMContentLoaded", () => {
+  "use strict";
+
+  // Utility functions
+  const utils = {
+    safeLocalStorage: {
+      getItem(key) {
+        try {
+          return localStorage.getItem(key);
+        } catch (e) {
+          console.warn("localStorage.getItem failed:", e);
+          return null;
+        }
+      },
+      setItem(key, value) {
+        try {
+          localStorage.setItem(key, value);
+          return true;
+        } catch (e) {
+          console.warn("localStorage.setItem failed:", e);
+          return false;
+        }
+      }
+    },
+
+    debounce(func, wait) {
+      let timeout;
+      return function executedFunction(...args) {
+        const later = () => {
+          clearTimeout(timeout);
+          func.apply(this, args);
+        };
+        clearTimeout(timeout);
+        timeout = setTimeout(later, wait);
+      };
+    },
+
+    throttle(func, limit) {
+      let inThrottle;
+      return function executedFunction(...args) {
+        if (!inThrottle) {
+          func.apply(this, args);
+          inThrottle = true;
+          setTimeout(() => inThrottle = false, limit);
+        }
+      };
+    }
+  };
+
+  // Dark Mode Manager
+  class DarkModeManager {
+    constructor() {
+      this.darkModeToggle = document.getElementById("darkModeToggle");
+      this.html = document.documentElement;
+      this.init();
+    }
+
+    init() {
+      this.loadSavedPreference();
+      this.attachEventListeners();
+    }
+
+    loadSavedPreference() {
+      const savedDarkMode = utils.safeLocalStorage.getItem("darkMode");
+      if (
+        savedDarkMode === "true" ||
+        (savedDarkMode === null &&
+          window.matchMedia("(prefers-color-scheme: dark)").matches)
+      ) {
+        this.html.classList.add("dark");
+      }
+    }
+
+    attachEventListeners() {
+      this.darkModeToggle?.addEventListener("click", () => {
+        this.html.classList.toggle("dark");
+        utils.safeLocalStorage.setItem("darkMode", this.html.classList.contains("dark"));
+      });
+    }
+  }
+
+  // Problem Manager
+  class ProblemManager {
+    constructor() {
+      this.problemSearch = document.getElementById("problemSearch");
+      this.problemsContainer = document.getElementById("problemsContainer");
+      this.problemsPagination = document.getElementById("problemsPagination");
+      this.problemsPrevBtn = document.getElementById("problemsPrevBtn");
+      this.problemsNextBtn = document.getElementById("problemsNextBtn");
+      this.problemsPaginationInfo = document.getElementById("problemsPaginationInfo");
+      this.difficultyFilter = document.getElementById("difficultyFilter");
+      this.sortProblems = document.getElementById("sortProblems");
+
+      this.allProblemItems = [];
+      this.filteredProblemItems = [];
+      this.currentPage = 1;
+      this.itemsPerPage = 5;
+      this.problemSort = { column: "alpha", direction: "asc" };
+      this.problemDescriptionPopover = null;
+      this.manifestCache = new Map();
+
+      this.init();
+    }
+
+    init() {
+      if (!this.problemsContainer) return;
+      
+      this.initializeProblemItems();
+      this.attachEventListeners();
+      this.injectPopoverCSS();
+      this.attachProblemHoverEvents();
+    }
+
+    initializeProblemItems() {
+      this.allProblemItems = Array.from(
+        this.problemsContainer.querySelectorAll(".problem-item") || []
+      );
+      this.filteredProblemItems = this.allProblemItems.map(this.getProblemData);
+      this.updatePagination();
+    }
+
+    getProblemData = (item) => ({
+      element: item,
+      name: item.dataset.name?.toLowerCase() || "",
+      desc: item.dataset.desc?.toLowerCase() || "",
+      difficulty: item.dataset.difficulty || "",
+    });
+
+    updatePagination() {
+      const totalPages = Math.ceil(this.filteredProblemItems.length / this.itemsPerPage);
+      const startIndex = (this.currentPage - 1) * this.itemsPerPage;
+      const endIndex = startIndex + this.itemsPerPage;
+
+      // Hide all items first
+      this.allProblemItems.forEach((item) => {
+        item.style.display = "none";
+      });
+
+      // Show current page items
+      this.filteredProblemItems.slice(startIndex, endIndex).forEach((item) => {
+        item.element.style.display = "";
+      });
+
+      // Update pagination controls
+      if (this.problemsPrevBtn) this.problemsPrevBtn.disabled = this.currentPage <= 1;
+      if (this.problemsNextBtn) this.problemsNextBtn.disabled = this.currentPage >= totalPages;
+      
+      if (this.problemsPaginationInfo) {
+        this.problemsPaginationInfo.textContent =
+          totalPages > 0
+            ? `Page ${this.currentPage} of ${totalPages}`
+            : "No problems found";
+      }
+
+      this.setupPaginationLayout();
+    }
+
+    setupPaginationLayout() {
+      if (this.problemsPagination) {
+        Object.assign(this.problemsPagination.style, {
+          display: "flex",
+          justifyContent: "center",
+          position: "absolute",
+          left: "0",
+          right: "0",
+          bottom: "0",
+          margin: "0 auto",
+          width: "100%",
+          background: "inherit",
+          borderTop: "1px solid var(--border)",
+          padding: "12px 0"
+        });
+        // Style the pagination buttons and info text
+        const prevBtn = this.problemsPagination.querySelector('#problemsPrevBtn');
+        const nextBtn = this.problemsPagination.querySelector('#problemsNextBtn');
+        const infoText = this.problemsPagination.querySelector('#problemsPaginationInfo');
+        if (prevBtn) prevBtn.style.marginRight = '10px';
+        if (nextBtn) nextBtn.style.marginLeft = '10px';
+        if (infoText) infoText.style.marginTop = '2px';
+        this.problemsPagination.classList.remove("hidden");
+      }
+
+      if (this.problemsContainer?.parentElement) {
+        Object.assign(this.problemsContainer.parentElement.style, {
+          position: "relative",
+          paddingBottom: "56px"
+        });
+      }
+    }
+
+    showProblemDescription = async (item) => {
+      this.hideProblemDescription();
+      
+      const folder = item.querySelector('a')?.getAttribute('href')?.split('/').pop();
+      if (!folder) return;
+
+      try {
+        let manifest = this.manifestCache.get(folder);
+        
+        if (!manifest) {
+          // Try localStorage cache first
+          const cacheKey = `problem_manifest_${folder}`;
+          const cached = utils.safeLocalStorage.getItem(cacheKey);
+          
+          if (cached) {
+            manifest = JSON.parse(cached);
+            this.manifestCache.set(folder, manifest);
+          } else {
+            // Fetch from API
+            const response = await fetch(`/api/problem_manifest/${encodeURIComponent(folder)}`);
+            manifest = response.ok ? await response.json() : { description: 'No description.' };
+            
+            this.manifestCache.set(folder, manifest);
+            utils.safeLocalStorage.setItem(cacheKey, JSON.stringify(manifest));
+          }
+        }
+
+        this.createPopover(manifest.description || 'No description.', item);
+      } catch (error) {
+        console.warn("Failed to load problem description:", error);
+        this.createPopover('No description available.', item);
+      }
+    };
+
+    createPopover(description, item) {
+      this.problemDescriptionPopover = document.createElement("div");
+      this.problemDescriptionPopover.className = "problem-desc-popover";
+      this.problemDescriptionPopover.textContent = description;
+      document.body.appendChild(this.problemDescriptionPopover);
+
+      const rect = item.getBoundingClientRect();
+      Object.assign(this.problemDescriptionPopover.style, {
+        position: "fixed",
+        left: `${rect.left + window.scrollX}px`,
+        top: `${rect.bottom + window.scrollY + 6}px`,
+        zIndex: "1000",
+        minWidth: `${rect.width}px`
+      });
+    }
+
+    hideProblemDescription = () => {
+      if (this.problemDescriptionPopover) {
+        this.problemDescriptionPopover.remove();
+        this.problemDescriptionPopover = null;
+      }
+    };
+
+    attachProblemHoverEvents() {
+      this.allProblemItems.forEach((item) => {
+        item.addEventListener("mouseenter", () => this.showProblemDescription(item));
+        item.addEventListener("mouseleave", this.hideProblemDescription);
+        item.addEventListener("mousemove", this.handleMouseMove);
+      });
+    }
+
+    handleMouseMove = utils.throttle((e) => {
+      if (this.problemDescriptionPopover) {
+        this.problemDescriptionPopover.style.left = `${e.clientX + 10}px`;
+      }
+    }, 16); // ~60fps
+
+    sortProblemItems(column, direction) {
+      this.filteredProblemItems.sort((a, b) => {
+        let valueA, valueB;
+        
+        switch (column) {
+          case "alpha":
+            valueA = a.name;
+            valueB = b.name;
+            break;
+          case "difficulty":
+            const difficultyOrder = { easy: 1, medium: 2, hard: 3 };
+            valueA = difficultyOrder[a.difficulty] || 0;
+            valueB = difficultyOrder[b.difficulty] || 0;
+            break;
+          default:
+            return 0;
+        }
+
+        let comparison = 0;
+        if (typeof valueA === "number" && typeof valueB === "number") {
+          comparison = valueA - valueB;
+        } else {
+          comparison = valueA < valueB ? -1 : valueA > valueB ? 1 : 0;
+        }
+
+        return direction === "asc" ? comparison : -comparison;
+      });
+    }
+
+    attachEventListeners() {
+      this.problemsPrevBtn?.addEventListener("click", () => {
+        if (this.currentPage > 1) {
+          this.currentPage--;
+          this.updatePagination();
+        }
+      });
+
+      this.problemsNextBtn?.addEventListener("click", () => {
+        const totalPages = Math.ceil(this.filteredProblemItems.length / this.itemsPerPage);
+        if (this.currentPage < totalPages) {
+          this.currentPage++;
+          this.updatePagination();
+        }
+      });
+
+      this.problemSearch?.addEventListener("input", utils.debounce(() => {
+        this.filterProblems();
+        this.currentPage = 1;
+        this.updatePagination();
+      }, 300));
+
+      this.difficultyFilter?.addEventListener("change", () => {
+        this.filterProblems();
+        this.currentPage = 1;
+        this.updatePagination();
+      });
+
+      this.sortProblems?.addEventListener("change", () => {
+        const value = this.sortProblems.value;
+        if (value === "alpha" || value === "difficulty") {
+          if (this.problemSort.column === value) {
+            this.problemSort.direction = this.problemSort.direction === "asc" ? "desc" : "asc";
+          } else {
+            this.problemSort.column = value;
+            this.problemSort.direction = "asc";
+          }
+          this.sortProblemItems(this.problemSort.column, this.problemSort.direction);
+          this.currentPage = 1;
+          this.updatePagination();
+        }
+      });
+    }
+
+    filterProblems() {
+      const searchTerm = (this.problemSearch?.value || "").toLowerCase().trim();
+      const difficulty = this.difficultyFilter?.value || "all";
+
+      this.filteredProblemItems = this.allProblemItems
+        .map(this.getProblemData)
+        .filter(item => {
+          const matchesSearch = !searchTerm || 
+            item.name.includes(searchTerm) || 
+            item.desc.includes(searchTerm);
+          
+          const matchesDifficulty = difficulty === "all" || 
+            item.difficulty === difficulty;
+
+          return matchesSearch && matchesDifficulty;
+        });
+    }
+
+    injectPopoverCSS() {
+      if (document.getElementById("problem-desc-popover-style")) return;
+      
+      const style = document.createElement("style");
+      style.id = "problem-desc-popover-style";
+      style.textContent = `
+        .problem-desc-popover {
+          background: var(--card, #fff);
+          color: var(--text, #222);
+          border: 1px solid var(--border, #e5e7eb);
+          border-radius: 8px;
+          box-shadow: 0 4px 16px rgba(16,24,40,0.13);
+          padding: 12px 16px;
+          font-size: 0.98rem;
+          max-width: 350px;
+          min-width: 180px;
+          pointer-events: none;
+          opacity: 0.97;
+          transition: opacity 0.2s;
+          word-break: break-word;
+        }
+        html.dark .problem-desc-popover {
+          background: var(--card, #1e293b);
+          color: var(--text, #f1f5f9);
+          border: 1px solid var(--border, #334155);
+        }
+      `;
+      document.head.appendChild(style);
+    }
+
+    destroy() {
+      // Clean up event listeners and resources
+      this.hideProblemDescription();
+      this.manifestCache.clear();
+    }
+  }
+
+  // Leaderboard Manager
+  class LeaderboardManager {
+    constructor() {
+      this.problemFilter = document.getElementById("problemFilter");
+      this.runtimeFilter = document.getElementById("runtimeFilter");
+      this.leaderboardBody = document.getElementById("leaderboardBody");
+      this.sortableHeaders = document.querySelectorAll(".sortable");
+      this.rankInfoBtn = document.getElementById("rankInfoBtn");
+      this.rankingExplanation = document.getElementById("rankingExplanation");
+
+      this.currentSort = { column: "rank", direction: "asc" };
+      this.allRows = [];
+      this.filteredRows = [];
+      this.currentPage = 1;
+      this.itemsPerPage = 5;
+      this.leaderboardPagination = document.createElement("div");
+      this.leaderboardPagination.className = "pagination-controls";
+      this.leaderboardPagination.style.display = "flex";
+      this.leaderboardPagination.style.justifyContent = "center";
+      this.leaderboardPagination.style.position = "absolute";
+      this.leaderboardPagination.style.left = 0;
+      this.leaderboardPagination.style.right = 0;
+      this.leaderboardPagination.style.bottom = 0;
+      this.leaderboardPagination.style.margin = "0 auto 0 auto";
+      this.leaderboardPagination.style.width = "100%";
+      this.leaderboardPagination.style.background = "inherit";
+      this.leaderboardPagination.style.borderTop = "1px solid var(--border)";
+      this.leaderboardPagination.style.padding = "12px 0";
+      this.leaderboardPagination.innerHTML = `
+        <button class="pagination-btn" id="leaderboardPrevBtn" disabled style="margin-right:10px;">← Previous</button>
+        <span class="pagination-info" id="leaderboardPaginationInfo" style="margin-top:2px;">Page 1 of 1</span>
+        <button class="pagination-btn" id="leaderboardNextBtn" disabled style="margin-left:10px;">Next →</button>
+      `;
+      this.leaderboardPrevBtn = this.leaderboardPagination.querySelector("#leaderboardPrevBtn");
+      this.leaderboardNextBtn = this.leaderboardPagination.querySelector("#leaderboardNextBtn");
+      this.leaderboardPaginationInfo = this.leaderboardPagination.querySelector("#leaderboardPaginationInfo");
+      this.init();
+    }
+
+    init() {
+      if (!this.leaderboardBody || this.leaderboardBody.children.length === 0) return;
+      this.initializeRows();
+      this.attachEventListeners();
+      this.filterLeaderboard();
+      this.setInitialSortIndicator();
+      // Insert pagination controls after leaderboard table
+      const leaderboardContainer = document.getElementById("leaderboardContainer");
+      if (leaderboardContainer && !leaderboardContainer.contains(this.leaderboardPagination)) {
+        leaderboardContainer.appendChild(this.leaderboardPagination);
+        // Ensure parent card is relatively positioned and has enough bottom padding
+        const leaderboardCard = leaderboardContainer.closest('.card');
+        if (leaderboardCard) {
+          leaderboardCard.style.position = "relative";
+          leaderboardCard.style.paddingBottom = "56px";
+        }
+      }
+      // Also ensure the parent card (section.card) contains the controls for correct layout
+      const leaderboardCard = leaderboardContainer?.closest('.card');
+      if (leaderboardCard && !leaderboardCard.contains(this.leaderboardPagination)) {
+        leaderboardCard.appendChild(this.leaderboardPagination);
+      }
+    }
+
+    initializeRows() {
+      this.allRows = Array.from(this.leaderboardBody.querySelectorAll("tr")).map((row, index) => ({
+        element: row,
+        user: row.dataset.user || "",
+        problem: row.dataset.problem || "",
+        runtime: parseFloat(row.dataset.runtime) || 0,
+        memory: parseFloat(row.dataset.memory) || 0,
+        timestamp: new Date(row.dataset.timestamp || Date.now()).getTime(),
+        language: row.dataset.language || "",
+        originalIndex: index,
+      }));
+    }
+
+    filterLeaderboard() {
+      const problemTerm = (this.problemFilter?.value || "").toLowerCase().trim();
+      const runtimeType = this.runtimeFilter?.value || "all";
+      // Filter rows
+      this.filteredRows = this.allRows.filter((rowData) => {
+        let visible = true;
+        if (problemTerm) {
+          visible = rowData.problem.toLowerCase().includes(problemTerm);
+        }
+        return visible;
+      });
+      // Apply runtime filter (best/worst per user per problem)
+      if (runtimeType === "best" || runtimeType === "worst") {
+        const userProblemGroups = {};
+        this.filteredRows.forEach((rowData) => {
+          const key = `${rowData.user}::${rowData.problem}`;
+          if (!userProblemGroups[key]) userProblemGroups[key] = [];
+          userProblemGroups[key].push(rowData);
+        });
+        this.filteredRows = Object.values(userProblemGroups).flatMap((group) => {
+          if (group.length <= 1) return group;
+          group.sort((a, b) => a.runtime - b.runtime);
+          const keepIndex = runtimeType === "best" ? 0 : group.length - 1;
+          return [group[keepIndex]];
+        });
+      }
+      this.currentPage = 1;
+      this.updateLeaderboardPagination();
+    }
+
+    updateLeaderboardPagination() {
+      const totalPages = Math.ceil(this.filteredRows.length / this.itemsPerPage) || 1;
+      if (this.currentPage > totalPages) this.currentPage = totalPages;
+      const startIndex = (this.currentPage - 1) * this.itemsPerPage;
+      const endIndex = startIndex + this.itemsPerPage;
+      // Hide all rows first
+      this.allRows.forEach((rowData) => {
+        rowData.element.style.display = "none";
+      });
+      // Show only current page rows
+      this.filteredRows.slice(startIndex, endIndex).forEach((rowData) => {
+        rowData.element.style.display = "";
+      });
+      // Update pagination controls
+      if (this.leaderboardPrevBtn) this.leaderboardPrevBtn.disabled = this.currentPage <= 1;
+      if (this.leaderboardNextBtn) this.leaderboardNextBtn.disabled = this.currentPage >= totalPages;
+      if (this.leaderboardPaginationInfo) {
+        this.leaderboardPaginationInfo.textContent =
+          totalPages > 0 ? `Page ${this.currentPage} of ${totalPages}` : "No entries found";
+      }
+      // Always show and center pagination at the bottom of the leaderboard card
+      if (this.leaderboardPagination) {
+        this.leaderboardPagination.classList.remove("hidden");
+        this.leaderboardPagination.style.display = "flex";
+        this.leaderboardPagination.style.justifyContent = "center";
+        this.leaderboardPagination.style.position = "absolute";
+        this.leaderboardPagination.style.left = 0;
+        this.leaderboardPagination.style.right = 0;
+        this.leaderboardPagination.style.bottom = 0;
+        this.leaderboardPagination.style.margin = "0 auto 0 auto";
+        this.leaderboardPagination.style.width = "100%";
+        this.leaderboardPagination.style.background = "inherit";
+        this.leaderboardPagination.style.borderTop = "1px solid var(--border)";
+        this.leaderboardPagination.style.padding = "12px 0";
+      }
+      // Make sure the parent leaderboard card is relatively positioned
+      const leaderboardContainer = document.getElementById("leaderboardContainer");
+      if (leaderboardContainer && leaderboardContainer.parentElement) {
+        leaderboardContainer.parentElement.style.position = "relative";
+        leaderboardContainer.parentElement.style.paddingBottom = "56px";
+      }
+      // Recalculate ranks for visible rows
+      this.calculateOverallRanking();
+    }
+
+    calculateOverallRanking() {
+      // Only consider visible rows (current page)
+      const visibleRows = this.filteredRows.slice(
+        (this.currentPage - 1) * this.itemsPerPage,
+        (this.currentPage - 1) * this.itemsPerPage + this.itemsPerPage
+      );
+      if (visibleRows.length === 0) return;
+      // Group submissions by problem to find the best performance for each
+      const problemBests = {};
+      visibleRows.forEach((rowData) => {
+        const problem = rowData.problem;
+        if (!problemBests[problem]) {
+          problemBests[problem] = {
+            bestRuntime: Infinity,
+            bestMemory: Infinity,
+          };
+        }
+        problemBests[problem].bestRuntime = Math.min(
+          problemBests[problem].bestRuntime,
+          rowData.runtime
+        );
+        problemBests[problem].bestMemory = Math.min(
+          problemBests[problem].bestMemory,
+          rowData.memory
+        );
+      });
+      // Calculate normalized scores for each submission
+      visibleRows.forEach((rowData) => {
+        const problemBest = problemBests[rowData.problem];
+        const runtimeScore =
+          problemBest.bestRuntime > 0
+            ? rowData.runtime / problemBest.bestRuntime
+            : 1;
+        const memoryScore =
+          problemBest.bestMemory > 0
+            ? rowData.memory / problemBest.bestMemory
+            : 1;
+        rowData.overallScore = runtimeScore * 0.7 + memoryScore * 0.3;
+      });
+      // Sort by overall score (lower is better), then by timestamp (earlier is better for ties)
+      visibleRows.sort((a, b) => {
+        const scoreDiff = a.overallScore - b.overallScore;
+        if (Math.abs(scoreDiff) > 0.000001) return scoreDiff;
+        return a.timestamp - b.timestamp;
+      });
+      // Reorder DOM elements and update ranks
+      const fragment = document.createDocumentFragment();
+      visibleRows.forEach((rowData, index) => {
+        fragment.appendChild(rowData.element);
+        // Update rank cell
+        const rankCell = rowData.element.cells[0];
+        if (rankCell) rankCell.textContent = index + 1 + (this.currentPage - 1) * this.itemsPerPage;
+        // Update rank classes
+        rowData.element.className = rowData.element.className.replace(/\brank-\d+\b/g, "");
+        if (index === 0) rowData.element.classList.add("rank-1");
+        else if (index < 3) rowData.element.classList.add("rank-top3");
+      });
+      this.leaderboardBody.appendChild(fragment);
+      // this.updateRankClasses(); // Function does not exist, so remove this call
+    }
+
+    attachEventListeners() {
+      // Sorting event listeners
+      this.sortableHeaders.forEach((header) => {
+        header.addEventListener("click", () => {
+          const column = header.dataset.sort;
+          if (!column) return;
+          // Remove sorting classes from all headers
+          this.sortableHeaders.forEach((h) => h.classList.remove("sort-asc", "sort-desc"));
+          // Toggle sort direction
+          if (this.currentSort.column === column) {
+            this.currentSort.direction = this.currentSort.direction === "asc" ? "desc" : "asc";
+          } else {
+            this.currentSort.column = column;
+            this.currentSort.direction = "asc";
+          }
+          // Add sorting class to current header
+          header.classList.add(`sort-${this.currentSort.direction}`);
+          // Sort filteredRows
+          this.filteredRows.sort((a, b) => {
+            let valueA = a[column];
+            let valueB = b[column];
+            if (typeof valueA === "string") valueA = valueA.toLowerCase();
+            if (typeof valueB === "string") valueB = valueB.toLowerCase();
+            let comparison = 0;
+            if (typeof valueA === "number" && typeof valueB === "number") {
+              comparison = valueA - valueB;
+            } else {
+              comparison = valueA < valueB ? -1 : valueA > valueB ? 1 : 0;
+            }
+            return this.currentSort.direction === "asc" ? comparison : -comparison;
+          });
+          this.currentPage = 1;
+          this.updateLeaderboardPagination();
+        });
+      });
+
+      // Filter event listeners with debouncing
+      this.problemFilter?.addEventListener("input", utils.debounce(() => {
+        this.filterLeaderboard();
+      }, 300));
+      this.runtimeFilter?.addEventListener("change", () => this.filterLeaderboard());
+
+      // Pagination event listeners
+      this.leaderboardPrevBtn?.addEventListener("click", () => {
+        if (this.currentPage > 1) {
+          this.currentPage--;
+          this.updateLeaderboardPagination();
+        }
+      });
+      this.leaderboardNextBtn?.addEventListener("click", () => {
+        const totalPages = Math.ceil(this.filteredRows.length / this.itemsPerPage) || 1;
+        if (this.currentPage < totalPages) {
+          this.currentPage++;
+          this.updateLeaderboardPagination();
+        }
+      });
+
+      // Rank info popout
+      this.rankInfoBtn?.addEventListener("click", (e) => {
+        e.preventDefault();
+        this.rankingExplanation?.classList.toggle("active");
+        this.rankInfoBtn?.classList.toggle("active");
+      });
+
+      // Close ranking explanation when clicking outside
+      document.addEventListener("click", (e) => {
+        if (
+          this.rankingExplanation?.classList.contains("active") &&
+          !this.rankingExplanation.contains(e.target) &&
+          !this.rankInfoBtn?.contains(e.target)
+        ) {
+          this.rankingExplanation.classList.remove("active");
+          this.rankInfoBtn?.classList.remove("active");
+        }
+      });
+    }
+
+    setInitialSortIndicator() {
+      const defaultHeader = document.querySelector('[data-sort="rank"]');
+      if (defaultHeader) {
+        defaultHeader.classList.add("sort-asc");
+      }
+    }
+  }
+
+  // Initialize all managers
+  const darkModeManager = new DarkModeManager();
+  const problemManager = new ProblemManager();
+  const leaderboardManager = new LeaderboardManager();
+
+  // Apply dark mode to dynamically created elements
+  const applyDarkModeToElements = () => {
+    // Any additional dark mode styling for dynamically created elements can go here
+  };
+
+  // Watch for dark mode changes
+  const darkModeObserver = new MutationObserver(applyDarkModeToElements);
+  darkModeObserver.observe(document.documentElement, {
+    attributes: true,
+    attributeFilter: ["class"],
+  });
+
+  // Cleanup on page unload
+  window.addEventListener("beforeunload", () => {
+    problemManager.destroy();
+    darkModeObserver.disconnect();
+  });
+});

src/app.py

@@ -1,124 +1,166 @@
-from markupsafe import Markup
-from flask import Flask, render_template, request, redirect, url_for, send_from_directory
-import markdown as md
-
-from models import db, Problem, Solution
-from utils import run_code_against_tests
-from leaderboard import create_leaderboard_table, log_leaderboard, get_leaderboard
-
-
-import os
-## from problem_loader import load_problems_from_json, schedule_problem_reload
-from problem_scanner import start_problem_scanner
-import sqlite3
-from pathlib import Path
-
-app = Flask(__name__)
-app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///db.sqlite3'
-db.init_app(app)
-
-
-
-@app.before_request
-def setup():
-    db.create_all()
-    create_leaderboard_table()  # Ensure leaderboard table exists
-    # Problems are now loaded from manifests by the background scanner. No need to load problems.json.
-
-# Start the background thread to scan problems
-start_problem_scanner()
-
-@app.route("/script.js")
-def script():
-    return send_from_directory("templates", "script.js")
-
-@app.route('/favicon.ico')
-def favicon():
-    return send_from_directory("templates", "favicon", "favicon.ico")
-
-@app.route('/')
-def index():
-    db_path = Path(__file__).parent / 'problems.sqlite3'
-    conn = sqlite3.connect(db_path)
-    c = conn.cursor()
-    c.execute('SELECT folder, description, test_code FROM problems')
-    problems = c.fetchall()
-    conn.close()
-    # Get leaderboard entries
-    leaderboard = get_leaderboard()
-    # Map folder to title for display
-    problem_titles = {folder: folder.replace('_', ' ').title() for folder, _, _ in problems}
-    return render_template('index.html', problems=problems, leaderboard=leaderboard, problem_titles=problem_titles)
-
-@app.route('/problem/new', methods=['GET', 'POST'])
-def new_problem():
-    if request.method == 'POST':
-        title = request.form['title']
-        description = request.form['description']
-        test_code = request.form['test_code']
-        problem = Problem(title=title, description=description, test_code=test_code)
-        db.session.add(problem)
-        db.session.commit()
-        return redirect(url_for('index'))
-    return render_template('new_problem.html')
-
-@app.route('/problem/<folder>', methods=['GET', 'POST'])
-def view_problem(folder):
-    db_path = Path(__file__).parent / 'problems.sqlite3'
-    conn = sqlite3.connect(db_path)
-    c = conn.cursor()
-    c.execute('SELECT folder, description, test_code FROM problems WHERE folder = ?', (folder,))
-    row = c.fetchone()
-    conn.close()
-    if not row:
-        return 'Problem not found', 404
-    problem = {
-        'folder': row[0],
-        'description': row[1],
-        'test_code': row[2],
-        'title': row[0].replace('_', ' ').title()
-    }
-    result = None
-    if request.method == 'POST':
-        user_code = request.form['user_code']
-        username = request.form.get('username', '').strip() or 'Anonymous'
-        import tracemalloc
-        tracemalloc.start()
-        run_result = run_code_against_tests(user_code, problem['test_code'])
-        current, peak = tracemalloc.get_traced_memory()
-        tracemalloc.stop()
-        memory_used = peak // 1024  # in KB
-        # Try to get the last line number executed (even for successful runs)
-        line_number = None
-        import ast
-        try:
-            tree = ast.parse(user_code)
-            # Find the highest line number in the AST (for multi-function/user code)
-            def get_max_lineno(node):
-                max_lineno = getattr(node, 'lineno', 0)
-                for child in ast.iter_child_nodes(node):
-                    max_lineno = max(max_lineno, get_max_lineno(child))
-                return max_lineno
-            line_number = get_max_lineno(tree)
-        except Exception:
-            pass
-        # If there was an error, try to get the error line number from the traceback
-        if run_result['error']:
-            tb = run_result['error']
-            import traceback
-            try:
-                tb_lines = traceback.extract_tb(traceback.TracebackException.from_string(tb).stack)
-                if tb_lines:
-                    line_number = tb_lines[-1].lineno
-            except Exception:
-                pass
-        log_leaderboard(username, problem['folder'], run_result['runtime'], memory_used, line_number)
-        result = run_result
-    return render_template('problem.html', problem=problem, result=result)
-
-@app.template_filter('markdown')
-def markdown_filter(text):
-    return Markup(md.markdown(text or '', extensions=['extra', 'sane_lists']))
-
-if __name__ == '__main__':
-    app.run(debug=True)
+# API endpoint to get problem manifest (description) by folder
+from markupsafe import Markup
+from flask import Flask, render_template, request, redirect, url_for, send_from_directory, jsonify
+from flask_caching import Cache
+import markdown as md
+import ast
+from src.models import db, Problem, Solution
+from src.utils import run_code_against_tests
+from src.leaderboard import create_leaderboard_table, log_leaderboard, get_leaderboard
+import os
+from src.problem_scanner import start_problem_scanner
+import sqlite3
+from pathlib import Path
+
+# Config cache
+config = {
+    "DEBUG": True,
+    "CACHE_TYPE": "SimpleCache",
+    "CACHE_DEFAULT_TIMEOUT": 300
+}
+
+app = Flask(__name__)
+app.config.from_mapping(config)
+cache = Cache(app)
+BASE_DIR = Path(__file__).parent
+app.config['SQLALCHEMY_DATABASE_URI'] = f"sqlite:///{BASE_DIR / 'database' / 'db.sqlite3'}"
+
+print(f"[ INFO ] : Using database URI: {app.config['SQLALCHEMY_DATABASE_URI']}")
+
+db.init_app(app)
+
+@app.before_request
+def setup():
+    db.create_all()
+    create_leaderboard_table()  # Ensure leaderboard table exists
+    # Problems are loaded from manifests by the background scanner ; running on a different thread. No need to load problems.json.
+
+# Start the background thread to scan problems
+start_problem_scanner()
+
+@app.route('/api/problem_manifest/<folder>')
+def api_problem_manifest(folder):
+    # Try to load manifest.json from the problem folder
+    import json
+    manifest_path = BASE_DIR / 'problems' / folder / 'manifest.json'
+    if not manifest_path.exists():
+        return jsonify({'error': 'Manifest not found'}), 404
+    try:
+        with open(manifest_path, 'r', encoding='utf-8') as f:
+            manifest = json.load(f)
+        return jsonify(manifest)
+    except Exception as e:
+        return jsonify({'error': str(e)}), 500
+
+# I introduce you to the fucking JavaScript shit routes, fuck javascripts
+@app.route('/JavaScript/<path:filename>')
+@cache.cached(timeout=300)
+def serve_js(filename):
+    return send_from_directory('JavaScript', filename)
+
+@app.route("/script.js")
+@cache.cached(timeout=300)
+def script():
+    return send_from_directory("JavaScript", "script.js")
+
+@app.route('/favicon.ico')
+@cache.cached()
+def favicon():
+    return send_from_directory("templates", "favicon.ico")
+
+@app.route('/')
+@cache.cached(timeout=300)
+def index():
+    db_path = Path(__file__).parent / 'database/problems.sqlite3'
+    conn = sqlite3.connect(db_path)
+    c = conn.cursor()
+    #<!-- The query was fucked up so it fetched the fucking testcode -->
+    c.execute('SELECT folder, description, test_code, difficulty FROM problems')
+    problems = c.fetchall()
+    conn.close()
+    # Get leaderboard entries
+    leaderboard = get_leaderboard()
+    # Map folder to title for display
+    problem_titles = {folder: folder.replace('_', ' ').title() for folder, _, _, _ in problems}
+    return render_template('index.html', problems=problems, leaderboard=leaderboard, problem_titles=problem_titles)
+
+@app.route('/problem/new', methods=['GET', 'POST'])
+def new_problem():
+    if request.method == 'POST':
+        title = request.form['title']
+        description = request.form['description']
+        test_code = request.form['test_code']
+        problem = Problem(title=title, description=description, test_code=test_code)
+        db.session.add(problem)
+        db.session.commit()
+        return redirect(url_for('index'))
+    return render_template('new_problem.html')
+
+@app.route('/problem/<folder>', methods=['GET', 'POST'])
+def view_problem(folder):
+    db_path = Path(__file__).parent / 'database/problems.sqlite3'
+    conn = sqlite3.connect(db_path)
+    c = conn.cursor()
+    c.execute('SELECT folder, description,test_code , difficulty FROM problems WHERE folder = ?', (folder,))
+    row = c.fetchone()
+    conn.close()
+    
+    if not row:
+        return 'Problem not found', 404
+        
+    problem = {
+        'folder': row[0],
+        'description': row[1],
+        'difficulty': row[3],  # now correct
+        'test_code': row[2],   # now correct
+    }
+
+    result = None
+    if request.method == 'POST':
+        user_code = request.form['user_code']
+        username = request.form.get('username', '').strip() or 'Anonymous'
+        import tracemalloc
+        tracemalloc.start()
+        run_result = run_code_against_tests(user_code, problem['test_code'])
+        current, peak = tracemalloc.get_traced_memory()
+        tracemalloc.stop()
+        memory_used = peak // 1024  # in KB
+        
+        # Try to get the last line number executed (even for successful runs)
+        line_number = None
+        try:
+            tree = ast.parse(user_code)
+            # Find the highest line number in the AST (for multi-function/user code)
+            def get_max_lineno(node):
+                max_lineno = getattr(node, 'lineno', 0)
+                for child in ast.iter_child_nodes(node):
+                    max_lineno = max(max_lineno, get_max_lineno(child))
+                return max_lineno
+            line_number = get_max_lineno(tree)
+        except Exception:
+            pass
+            
+        # If there was an error, try to get the error line number from the traceback
+        if run_result['error']:
+            tb = run_result['error']
+            import traceback
+            try:
+                tb_lines = traceback.extract_tb(traceback.TracebackException.from_string(tb).stack)
+                if tb_lines:
+                    line_number = tb_lines[-1].lineno
+            except Exception:
+                pass
+        
+        # ONLY log to leaderboard if the solution passed all tests
+        if run_result['passed']:
+            log_leaderboard(username, problem['folder'], run_result['runtime'], memory_used, line_number)
+        
+        result = run_result
+    return render_template('problem.html', problem=problem, result=result)
+
+@app.template_filter('markdown')
+def markdown_filter(text):
+    return Markup(md.markdown(text or '', extensions=['extra', 'sane_lists']))
+
+if __name__ == '__main__':
+    app.run(debug=True)

src/cache.py

@@ -0,0 +1,222 @@
+"""
+High-performance in-memory caching module with LRU eviction policy.
+"""
+import time
+from typing import Any, Callable, Optional, Dict, List, Tuple
+import threading
+import functools
+import logging
+
+# Set up logging
+logging.basicConfig(level=logging.INFO)
+logger = logging.getLogger(__name__)
+
+class CacheEntry:
+    """Represents a single cache entry with metadata."""
+    
+    __slots__ = ('value', 'timestamp', 'expires_at', 'hits')
+    
+    def __init__(self, value: Any, timeout: int):
+        self.value = value
+        self.timestamp = time.time()
+        self.expires_at = self.timestamp + timeout
+        self.hits = 0
+    
+    def is_expired(self) -> bool:
+        """Check if the cache entry has expired."""
+        return time.time() >= self.expires_at
+    
+    def hit(self) -> None:
+        """Increment the hit counter."""
+        self.hits += 1
+
+class FastMemoryCache:
+    """
+    High-performance in-memory cache with LRU eviction policy.
+    Thread-safe and optimized for frequent reads.
+    """
+    
+    def __init__(self, max_size: int = 1000, default_timeout: int = 300):
+        """
+        Initialize the cache.
+        
+        Args:
+            max_size: Maximum number of items to store in cache
+            default_timeout: Default expiration time in seconds
+        """
+        self.max_size = max_size
+        self.default_timeout = default_timeout
+        self._cache: Dict[str, CacheEntry] = {}
+        self._lock = threading.RLock()
+        self._hits = 0
+        self._misses = 0
+        self._evictions = 0
+        
+        # Start background cleaner thread
+        self._cleaner_thread = threading.Thread(target=self._clean_expired, daemon=True)
+        self._cleaner_thread.start()
+    
+    def get(self, key: str) -> Optional[Any]:
+        """
+        Get a value from the cache.
+        
+        Args:
+            key: Cache key
+            
+        Returns:
+            Cached value or None if not found/expired
+        """
+        with self._lock:
+            entry = self._cache.get(key)
+            
+            if entry is None:
+                self._misses += 1
+                return None
+            
+            if entry.is_expired():
+                del self._cache[key]
+                self._misses += 1
+                self._evictions += 1
+                return None
+            
+            entry.hit()
+            self._hits += 1
+            return entry.value
+    
+    def set(self, key: str, value: Any, timeout: Optional[int] = None) -> None:
+        """
+        Set a value in the cache.
+        
+        Args:
+            key: Cache key
+            value: Value to cache
+            timeout: Optional timeout in seconds (uses default if None)
+        """
+        if timeout is None:
+            timeout = self.default_timeout
+        
+        with self._lock:
+            # Evict if cache is full (LRU policy)
+            if len(self._cache) >= self.max_size and key not in self._cache:
+                self._evict_lru()
+            
+            self._cache[key] = CacheEntry(value, timeout)
+    
+    def delete(self, key: str) -> bool:
+        """
+        Delete a key from the cache.
+        
+        Args:
+            key: Cache key to delete
+            
+        Returns:
+            True if key was deleted, False if not found
+        """
+        with self._lock:
+            if key in self._cache:
+                del self._cache[key]
+                self._evictions += 1
+                return True
+            return False
+    
+    def clear(self) -> None:
+        """Clear all items from the cache."""
+        with self._lock:
+            self._cache.clear()
+            self._evictions += len(self._cache)
+    
+    def _evict_lru(self) -> None:
+        """Evict the least recently used item from the cache."""
+        if not self._cache:
+            return
+        
+        # Find the entry with the fewest hits (simplified LRU)
+        lru_key = min(self._cache.keys(), key=lambda k: self._cache[k].hits)
+        del self._cache[lru_key]
+        self._evictions += 1
+    
+    def _clean_expired(self) -> None:
+        """Background thread to clean expired entries."""
+        while True:
+            time.sleep(60)  # Clean every minute
+            with self._lock:
+                expired_keys = [
+                    key for key, entry in self._cache.items()
+                    if entry.is_expired()
+                ]
+                for key in expired_keys:
+                    del self._cache[key]
+                    self._evictions += 1
+                
+                if expired_keys:
+                    logger.info(f"Cleaned {len(expired_keys)} expired cache entries")
+    
+    def get_stats(self) -> Dict[str, Any]:
+        """
+        Get cache statistics.
+        
+        Returns:
+            Dictionary with cache statistics
+        """
+        with self._lock:
+            return {
+                'size': len(self._cache),
+                'hits': self._hits,
+                'misses': self._misses,
+                'hit_ratio': self._hits / (self._hits + self._misses) if (self._hits + self._misses) > 0 else 0,
+                'evictions': self._evictions,
+                'max_size': self.max_size
+            }
+    
+    def keys(self) -> List[str]:
+        """Get all cache keys."""
+        with self._lock:
+            return list(self._cache.keys())
+
+# Global cache instance
+cache = FastMemoryCache(max_size=2000, default_timeout=300)
+
+def cached(timeout: Optional[int] = None, unless: Optional[Callable] = None):
+    """
+    Decorator for caching function results.
+    
+    Args:
+        timeout: Cache timeout in seconds
+        unless: Callable that returns True to bypass cache
+    """
+    def decorator(func):
+        @functools.wraps(func)
+        def wrapper(*args, **kwargs):
+            # Bypass cache if unless condition is met
+            if unless and unless():
+                return func(*args, **kwargs)
+            
+            # Create cache key from function name and arguments
+            key_parts = [func.__module__, func.__name__]
+            key_parts.extend(str(arg) for arg in args)
+            key_parts.extend(f"{k}={v}" for k, v in sorted(kwargs.items()))
+            key = "|".join(key_parts)
+            
+            # Try to get from cache
+            cached_result = cache.get(key)
+            if cached_result is not None:
+                logger.info(f"Cache hit for {func.__name__}")
+                return cached_result
+            
+            # Call function and cache result
+            result = func(*args, **kwargs)
+            cache.set(key, result, timeout)
+            logger.info(f"Cache miss for {func.__name__}, caching result")
+            
+            return result
+        return wrapper
+    return decorator
+
+def cache_clear() -> None:
+    """Clear the entire cache."""
+    cache.clear()
+    logger.info("Cache cleared")
+
+def cache_stats() -> Dict[str, Any]:
+    """Get cache statistics."""
+    return cache.get_stats()

src/leaderboard.py

@@ -2,12 +2,14 @@ from flask_sqlalchemy import SQLAlchemy
 from flask import g
 import os
 import sqlite3
+from pathlib import Path
 
 def get_db():
-    db = getattr(g, '_database', None)
-    if db is None:
-        db = g._database = sqlite3.connect(os.path.join(os.path.dirname(__file__), 'db.sqlite3'))
-    return db
+    if 'db' not in g:
+        db_path = Path(__file__).parent / 'database' / 'db.sqlite3'
+        db_path.parent.mkdir(exist_ok=True)  # Ensure /database folder exists
+        g.db = sqlite3.connect(db_path)
+    return g.db
 
 def create_leaderboard_table():
     db = get_db()

src/problem_scanner.py

@@ -1,376 +1,385 @@
-import os
-import time
-import json
-import sqlite3
-import threading
-import random
-import tempfile
-import subprocess
-import sys
-import traceback
-import io
-from pathlib import Path
-
-try:
-    from watchdog.observers import Observer
-    from watchdog.events import FileSystemEventHandler
-    WATCHDOG_AVAILABLE = True
-except ImportError:
-    WATCHDOG_AVAILABLE = False
-
-PROBLEMS_DIR = Path(__file__).parent / 'problems'
-DB_PATH = Path(__file__).parent / 'problems.sqlite3'
-
-class ProblemScannerThread(threading.Thread):
-    def __init__(self, scan_interval=2):
-        super().__init__(daemon=True)
-        self.scan_interval = scan_interval
-        self.last_state = {}
-        self.observer = None
-
-    def create_table(self, conn):
-        c = conn.cursor()
-        c.execute('PRAGMA journal_mode=WAL;')
-        c.execute('''CREATE TABLE IF NOT EXISTS problems (
-            id INTEGER PRIMARY KEY AUTOINCREMENT,
-            folder TEXT,
-            description TEXT,
-            test_code TEXT
-        )''')
-        conn.commit()
-
-    def scan(self):
-        problems = []
-        if not PROBLEMS_DIR.exists():
-            print(f"Problems directory does not exist: {PROBLEMS_DIR}")
-            return problems
-            
-        for folder in PROBLEMS_DIR.iterdir():
-            if folder.is_dir():
-                # Dynamically find manifest file (manifest.json or manifets.json)
-                manifest_path = None
-                for candidate in ["manifest.json", "manifets.json"]:
-                    candidate_path = folder / candidate
-                    if candidate_path.exists():
-                        manifest_path = candidate_path
-                        break
-                
-                desc_path = folder / 'description.md'
-                test_path = folder / 'test.py'
-                
-                # Check if required files exist
-                if manifest_path and desc_path.exists() and test_path.exists():
-                    try:
-                        with open(desc_path, 'r', encoding='utf-8') as f:
-                            description = f.read()
-                        with open(test_path, 'r', encoding='utf-8') as f:
-                            test_code = f.read()
-                        
-                        problems.append({
-                            'folder': folder.name,
-                            'description': description,
-                            'test_code': test_code
-                        })
-                        print(f"Found problem: {folder.name}")
-                    except Exception as e:
-                        print(f"Error reading problem files for {folder.name}: {e}")
-                else:
-                    missing_files = []
-                    if not manifest_path:
-                        missing_files.append("manifest.json/manifets.json")
-                    if not desc_path.exists():
-                        missing_files.append("description.md")
-                    if not test_path.exists():
-                        missing_files.append("test.py")
-                    print(f"Skipping {folder.name}: missing {', '.join(missing_files)}")
-        
-        print(f"Total problems found: {len(problems)}")
-        return problems
-
-    def update_db(self, problems, retries=5):
-        for attempt in range(retries):
-            try:
-                conn = sqlite3.connect(DB_PATH, timeout=5)
-                c = conn.cursor()
-                c.execute('PRAGMA journal_mode=WAL;')
-                
-                # Clear existing problems
-                c.execute('DELETE FROM problems')
-                
-                # Insert new problems
-                for p in problems:
-                    c.execute('INSERT INTO problems (folder, description, test_code) VALUES (?, ?, ?)',
-                              (p['folder'], p['description'], p['test_code']))
-                
-                conn.commit()
-                print(f"Updated database with {len(problems)} problems")
-                conn.close()
-                return
-                
-            except sqlite3.OperationalError as e:
-                if 'locked' in str(e).lower():
-                    wait_time = 0.2 + random.random() * 0.3
-                    print(f"Database locked, retrying in {wait_time:.2f}s (attempt {attempt + 1})")
-                    time.sleep(wait_time)
-                else:
-                    print(f"Database error: {e}")
-                    raise
-            except Exception as e:
-                print(f"Unexpected error updating database: {e}")
-                raise
-                
-        print('Failed to update problems DB after several retries due to lock.')
-
-    def rescan_and_update(self):
-        print("Scanning for problems...")
-        problems = self.scan()
-        self.update_db(problems)
-
-    def run(self):
-        print("Starting problem scanner...")
-        
-        # Initial scan and table creation
-        try:
-            conn = sqlite3.connect(DB_PATH)
-            self.create_table(conn)
-            conn.close()
-            print("Database initialized")
-        except Exception as e:
-            print(f"Failed to initialize database: {e}")
-            return
-            
-        # Initial scan
-        self.rescan_and_update()
-        
-        if WATCHDOG_AVAILABLE:
-            print("Using watchdog for file monitoring")
-            
-            class Handler(FileSystemEventHandler):
-                def __init__(self, scanner):
-                    self.scanner = scanner
-                    self.last_event_time = 0
-                    
-                def on_any_event(self, event):
-                    # Debounce events to avoid too many rescans
-                    now = time.time()
-                    if now - self.last_event_time > 1:  # Wait at least 1 second between rescans
-                        self.last_event_time = now
-                        print(f"File system event: {event.event_type} - {event.src_path}")
-                        self.scanner.rescan_and_update()
-                        
-            event_handler = Handler(self)
-            self.observer = Observer()
-            self.observer.schedule(event_handler, str(PROBLEMS_DIR), recursive=True)
-            self.observer.start()
-            
-            try:
-                while True:
-                    time.sleep(1)
-            except KeyboardInterrupt:
-                print("Stopping problem scanner...")
-            finally:
-                self.observer.stop()
-                self.observer.join()
-        else:
-            print(f"Watchdog not available, using polling every {self.scan_interval}s")
-            # Fallback: poll every scan_interval seconds
-            try:
-                while True:
-                    time.sleep(self.scan_interval)
-                    self.rescan_and_update()
-            except KeyboardInterrupt:
-                print("Stopping problem scanner...")
-
-def start_problem_scanner():
-    scanner = ProblemScannerThread()
-    scanner.start()
-    return scanner
-
-# Flask model loading functions
-def load_problems_from_json(json_path):
-    """Load problems from JSON file into Flask database"""
-    if not os.path.exists(json_path):
-        print(f"Problem JSON file not found: {json_path}")
-        return
-        
-    try:
-        with open(json_path, 'r', encoding='utf-8') as f:
-            problems = json.load(f)
-    except Exception as e:
-        print(f"Error reading JSON file: {e}")
-        return
-        
-    # This assumes you have imported the necessary Flask/SQLAlchemy components
-    try:
-        from models import db, Problem
-        
-        for p in problems:
-            # Check if problem already exists by title
-            existing = Problem.query.filter_by(title=p['title']).first()
-            
-            # Load test code from solution file if provided
-            test_code = ''
-            if 'solution' in p and os.path.exists(p['solution']):
-                try:
-                    with open(p['solution'], 'r', encoding='utf-8') as sf:
-                        test_code = sf.read()
-                except Exception as e:
-                    print(f"Error reading solution file for {p['title']}: {e}")
-                    
-            if existing:
-                existing.description = p['description']
-                existing.test_code = test_code
-                print(f"Updated problem: {p['title']}")
-            else:
-                new_problem = Problem(title=p['title'], description=p['description'], test_code=test_code)
-                db.session.add(new_problem)
-                print(f"Added new problem: {p['title']}")
-                
-        db.session.commit()
-        print("Successfully updated problems from JSON")
-        
-    except ImportError:
-        print("Flask models not available - skipping JSON load")
-    except Exception as e:
-        print(f"Error loading problems from JSON: {e}")
-
-def schedule_problem_reload(app, json_path, interval_hours=10):
-    """Schedule periodic reloading of problems from JSON"""
-    def reload_loop():
-        while True:
-            try:
-                with app.app_context():
-                    load_problems_from_json(json_path)
-                time.sleep(interval_hours * 3600)
-            except Exception as e:
-                print(f"Error in problem reload loop: {e}")
-                time.sleep(60)  # Wait 1 minute before retrying
-                
-    t = threading.Thread(target=reload_loop, daemon=True)
-    t.start()
-
-def run_code_against_tests(user_code, test_code, timeout=10):
-    """
-    Execute user code against test code with proper error handling.
-    
-    Args:
-        user_code: The user's solution code
-        test_code: The test code to validate the solution
-        timeout: Maximum execution time in seconds
-    
-    Returns:
-        dict: Result with passed, output, runtime, and error fields
-    """
-    if not user_code or not user_code.strip():
-        return {
-            'passed': False,
-            'output': '',
-            'runtime': 0,
-            'error': 'No code provided'
-        }
-    
-    if not test_code or not test_code.strip():
-        return {
-            'passed': False,
-            'output': '',
-            'runtime': 0,
-            'error': 'No test code available'
-        }
-    
-    start_time = time.perf_counter()
-    output = ''
-    error = None
-    passed = False
-    temp_file = None
-    
-    try:
-        # Check if unittest is used in test_code
-        if 'unittest' in test_code:
-            # Create temporary file with user code + test code
-            with tempfile.NamedTemporaryFile('w+', suffix='.py', delete=False, encoding='utf-8') as f:
-                # Combine user code and test code
-                combined_code = f"{user_code}\n\n{test_code}"
-                f.write(combined_code)
-                f.flush()
-                temp_file = f.name
-            
-            try:
-                # Run the file as a subprocess with timeout
-                proc = subprocess.run(
-                    [sys.executable, temp_file], 
-                    capture_output=True, 
-                    text=True, 
-                    timeout=timeout,
-                    encoding='utf-8'
-                )
-                
-                output = proc.stdout
-                if proc.stderr:
-                    output += f"\nSTDERR:\n{proc.stderr}"
-                
-                passed = proc.returncode == 0
-                if not passed:
-                    error = f"Tests failed. Return code: {proc.returncode}\n{output}"
-                    
-            except subprocess.TimeoutExpired:
-                passed = False
-                error = f"Code execution timed out after {timeout} seconds"
-                output = "Execution timed out"
-                
-        else:
-            # Direct execution approach for simple assert-based tests
-            local_ns = {}
-            
-            # Capture stdout
-            old_stdout = sys.stdout
-            captured_output = io.StringIO()
-            sys.stdout = captured_output
-            
-            try:
-                # Execute user code first
-                exec(user_code, {}, local_ns)
-                
-                # Execute test code in the same namespace
-                exec(test_code, local_ns, local_ns)
-                
-                # If we get here without exceptions, tests passed
-                passed = True
-                
-            except AssertionError as e:
-                passed = False
-                error = f"Assertion failed: {str(e)}"
-                
-            except Exception as e:
-                passed = False
-                error = f"Runtime error: {traceback.format_exc()}"
-                
-            finally:
-                output = captured_output.getvalue()
-                sys.stdout = old_stdout
-                
-    except Exception as e:
-        passed = False
-        error = f"Execution error: {traceback.format_exc()}"
-        
-    finally:
-        # Clean up temporary file
-        if temp_file and os.path.exists(temp_file):
-            try:
-                os.unlink(temp_file)
-            except Exception as e:
-                print(f"Warning: Could not delete temp file {temp_file}: {e}")
-    
-    runtime = time.perf_counter() - start_time
-    
-    result = {
-        'passed': passed,
-        'output': output.strip() if output else '',
-        'runtime': runtime,
-        'error': error if not passed else None
-    }
-    
-    print(f"Test execution result: passed={passed}, runtime={runtime:.3f}s")
-    if error:
-        print(f"Error: {error}")
-    
-    return result
+import os
+import time
+import json
+import sqlite3
+import threading
+import random
+import tempfile
+import subprocess
+import sys
+import traceback
+import io
+from pathlib import Path
+
+try:
+    from watchdog.observers import Observer
+    from watchdog.events import FileSystemEventHandler
+    WATCHDOG_AVAILABLE = True
+except ImportError:
+    WATCHDOG_AVAILABLE = False
+
+PROBLEMS_DIR = Path(__file__).parent / 'problems'
+DB_PATH = Path(__file__).parent / 'database/problems.sqlite3'
+
+class ProblemScannerThread(threading.Thread):
+    def __init__(self, scan_interval=2):
+        super().__init__(daemon=True)
+        self.scan_interval = scan_interval
+        self.last_state = {}
+        self.observer = None
+
+    def create_table(self, conn):
+        c = conn.cursor()
+        c.execute('PRAGMA journal_mode=WAL;')
+        c.execute('''CREATE TABLE IF NOT EXISTS problems (
+            id INTEGER PRIMARY KEY AUTOINCREMENT,
+            folder TEXT,
+            description TEXT,
+            difficulty TEXT,
+            test_code TEXT
+        )''')
+        conn.commit()
+
+    def scan(self):
+        problems = []
+        if not PROBLEMS_DIR.exists():
+            print(f"Problems directory does not exist: {PROBLEMS_DIR}")
+            return problems
+            
+        for folder in PROBLEMS_DIR.iterdir():
+            if folder.is_dir():
+                # Dynamically find manifest file (manifest.json or manifests.json)
+                manifest_path = None
+                for candidate in ["manifest.json", "manifests.json"]:
+                    candidate_path = folder / candidate
+                    if candidate_path.exists():
+                        manifest_path = candidate_path
+                        break
+                
+                desc_path = folder / 'description.md'
+                test_path = folder / 'test.py'
+                
+                # Check if required files exist
+                if manifest_path and desc_path.exists() and test_path.exists():
+                    try:
+                        with open(desc_path, 'r', encoding='utf-8') as f:
+                            description = f.read()
+                        with open(test_path, 'r', encoding='utf-8') as f:
+                            test_code = f.read()
+                        with open(manifest_path, 'r', encoding='utf-8') as f:
+                            manifest = json.load(f)
+
+                        difficulty = manifest.get('difficulty', 'unknown')
+
+                        problems.append({
+                            'folder': folder.name,
+                            'description': description,
+                            'test_code': test_code,
+                            'difficulty': difficulty
+                        })
+                        print(f"[ INFO ]: Found problem: {folder.name} ; Difficulty: {difficulty}")
+                    except Exception as e:
+                        print(f"[ ERROR ]: Error reading problem files for {folder.name}: {e}")
+                else:
+                    missing_files = []
+                    if not manifest_path:
+                        missing_files.append("manifest.json/manifets.json")
+                    if not desc_path.exists():
+                        missing_files.append("description.md")
+                    if not test_path.exists():
+                        missing_files.append("test.py")
+                    print(f"[ SKIP ]: Skipping {folder.name}: missing {', '.join(missing_files)}")
+        
+        print(f"[ INFO ]: Total problems found: {len(problems)}")
+        return problems
+
+    def update_db(self, problems, retries=5):
+        for attempt in range(retries):
+            try:
+                conn = sqlite3.connect(DB_PATH, timeout=5)
+                c = conn.cursor()
+                c.execute('PRAGMA journal_mode=WAL;')
+                
+                # Clear existing problems
+                c.execute('DELETE FROM problems')
+                
+                # Insert new problems
+                for p in problems:
+                    c.execute('''INSERT INTO problems 
+                                (folder, description, difficulty, test_code) 
+                                VALUES (?, ?, ?, ?)''',
+                                (p['folder'], p['description'], p['difficulty'], p['test_code']))
+                
+                conn.commit()
+                print(f"[ INFO ]: Updated database with {len(problems)} problems")
+                conn.close()
+                return
+                
+            except sqlite3.OperationalError as e:
+                if 'locked' in str(e).lower():
+                    wait_time = 0.2 + random.random() * 0.3
+                    print(f"[ WARNING ]: Database locked, retrying in {wait_time:.2f}s (attempt {attempt + 1})")
+                    time.sleep(wait_time)
+                else:
+                    print(f"[ ERROR ]: Database error: {e}")
+                    raise
+            except Exception as e:
+                print(f"[ ERROR ]: Unexpected error updating database: {e}")
+                raise
+                
+        print('[ FATAL ERROR ]: Failed to update problems DB after several retries due to lock.')
+
+    def rescan_and_update(self):
+        print("[ INFO ]: Scanning for problems...")
+        problems = self.scan()
+        self.update_db(problems)
+
+    def run(self):
+        print("[ INFO ]: Starting problem scanner...")
+        
+        # Initial scan and table creation
+        try:
+            conn = sqlite3.connect(DB_PATH)
+            self.create_table(conn)
+            conn.close()
+            print("[ INFO ]: Database initialized")
+        except Exception as e:
+            print(f"[ FATAL ERROR ]: Failed to initialize database: {e}")
+            return
+            
+        # Initial scan
+        self.rescan_and_update()
+        
+        if WATCHDOG_AVAILABLE:
+            print("[ INFO ]: Using watchdog for file monitoring")
+            
+            class Handler(FileSystemEventHandler):
+                def __init__(self, scanner):
+                    self.scanner = scanner
+                    self.last_event_time = 0
+                    
+                def on_any_event(self, event):
+                    # Debounce events to avoid too many rescans
+                    now = time.time()
+                    if now - self.last_event_time > 1:  # Wait at least 1 second between rescans
+                        self.last_event_time = now
+                        print(f"[ FSINFO ]: File system event: {event.event_type} - {event.src_path}")
+                        self.scanner.rescan_and_update()
+                        
+            event_handler = Handler(self)
+            self.observer = Observer()
+            self.observer.schedule(event_handler, str(PROBLEMS_DIR), recursive=True)
+            self.observer.start()
+            
+            try:
+                while True:
+                    time.sleep(1)
+            except KeyboardInterrupt:
+                print("[ KBINT_INFO ]: Stopping problem scanner...")
+            finally:
+                self.observer.stop()
+                self.observer.join()
+        else:
+            print(f"[ WARNING ]: Watchdog not available, using polling every {self.scan_interval}s")
+            # Fallback: poll every scan_interval seconds
+            try:
+                while True:
+                    time.sleep(self.scan_interval)
+                    self.rescan_and_update()
+            except KeyboardInterrupt:
+                print("[ KBINT_INFO ]: Stopping problem scanner...")
+
+def start_problem_scanner():
+    scanner = ProblemScannerThread()
+    scanner.start()
+    return scanner
+
+# Flask model loading functions
+def load_problems_from_json(json_path):
+    """Load problems from JSON file into Flask database"""
+    if not os.path.exists(json_path):
+        print(f"[ DEPRECATED_INFO ]: Problem JSON file not found: {json_path}")
+        print("[ SUGGESTION ]: If you dont have this do not worry. Use mainfest.json!")
+        return
+        
+    try:
+        with open(json_path, 'r', encoding='utf-8') as f:
+            problems = json.load(f)
+    except Exception as e:
+        print(f"[ ERROR ]: Error reading JSON file: {e}")
+        return
+        
+    # This assumes you have imported the necessary Flask/SQLAlchemy components
+    try:
+        from models import db, Problem
+        
+        for p in problems:
+            # Check if problem already exists by title
+            existing = Problem.query.filter_by(title=p['title']).first()
+            
+            # Load test code from solution file if provided
+            test_code = ''
+            if 'solution' in p and os.path.exists(p['solution']):
+                try:
+                    with open(p['solution'], 'r', encoding='utf-8') as sf:
+                        test_code = sf.read()
+                except Exception as e:
+                    print(f"[ FATAL ERROR ]: Error reading solution file for {p['title']}: {e}")
+                    
+            if existing:
+                existing.description = p['description']
+                existing.test_code = test_code
+                print(f"[ INFO ]: Updated problem: {p['title']}")
+            else:
+                new_problem = Problem(title=p['title'], description=p['description'], test_code=test_code)
+                db.session.add(new_problem)
+                print(f"[ SUCCESS ]: Added new problem: {p['title']}")
+                
+        db.session.commit()
+        print("[ SUCCESS ]: Successfully updated problems from JSON")
+        
+    except ImportError:
+        print("[ FATAL IMPORT ERROR ]: Flask models not available - skipping JSON load @execptImportError")
+    except Exception as e:
+        print(f"[ ERROR ]: Error loading problems from JSON: {e}")
+
+def schedule_problem_reload(app, json_path, interval_hours=10):
+    """Schedule periodic reloading of problems from JSON"""
+    def reload_loop():
+        while True:
+            try:
+                with app.app_context():
+                    load_problems_from_json(json_path)
+                time.sleep(interval_hours * 3600)
+            except Exception as e:
+                print(f"[ FATAL ERROR ]: Error in problem reload loop: {e}")
+                time.sleep(60)  # Wait 1 minute before retrying
+                
+    t = threading.Thread(target=reload_loop, daemon=True)
+    t.start()
+
+def run_code_against_tests(user_code, test_code, timeout=10):
+    """
+    Execute user code against test code with proper error handling.
+    
+    Args:
+        user_code: The user's solution code
+        test_code: The test code to validate the solution
+        timeout: Maximum execution time in seconds
+    
+    Returns:
+        dict: Result with passed, output, runtime, and error fields
+    """
+    if not user_code or not user_code.strip():
+        return {
+            'passed': False,
+            'output': '',
+            'runtime': 0,
+            'error': 'No code provided'
+        }
+    
+    if not test_code or not test_code.strip():
+        return {
+            'passed': False,
+            'output': '',
+            'runtime': 0,
+            'error': 'No test code available'
+        }
+    
+    start_time = time.perf_counter()
+    output = ''
+    error = None
+    passed = False
+    temp_file = None
+    
+    try:
+        # Check if unittest is used in test_code
+        if 'unittest' in test_code:
+            # Create temporary file with user code + test code
+            with tempfile.NamedTemporaryFile('w+', suffix='.py', delete=False, encoding='utf-8') as f:
+                # Combine user code and test code
+                combined_code = f"{user_code}\n\n{test_code}"
+                f.write(combined_code)
+                f.flush()
+                temp_file = f.name
+            
+            try:
+                # Run the file as a subprocess with timeout
+                proc = subprocess.run(
+                    [sys.executable, temp_file], 
+                    capture_output=True, 
+                    text=True, 
+                    timeout=timeout,
+                    encoding='utf-8'
+                )
+                
+                output = proc.stdout
+                if proc.stderr:
+                    output += f"\nSTDERR:\n{proc.stderr}"
+                
+                passed = proc.returncode == 0
+                if not passed:
+                    error = f"Tests failed. Return code: {proc.returncode}\n{output}"
+                    
+            except subprocess.TimeoutExpired:
+                passed = False
+                error = f"Code execution timed out after {timeout} seconds"
+                output = "Execution timed out"
+                
+        else:
+            # Direct execution approach for simple assert-based tests
+            local_ns = {}
+            
+            # Capture stdout
+            old_stdout = sys.stdout
+            captured_output = io.StringIO()
+            sys.stdout = captured_output
+            
+            try:
+                # Execute user code first
+                exec(user_code, {}, local_ns)
+                
+                # Execute test code in the same namespace
+                exec(test_code, local_ns, local_ns)
+                
+                # If we get here without exceptions, tests passed
+                passed = True
+                
+            except AssertionError as e:
+                passed = False
+                error = f"Assertion failed: {str(e)}"
+                
+            except Exception as e:
+                passed = False
+                error = f"Runtime error: {traceback.format_exc()}"
+                
+            finally:
+                output = captured_output.getvalue()
+                sys.stdout = old_stdout
+                
+    except Exception as e:
+        passed = False
+        error = f"Execution error: {traceback.format_exc()}"
+        
+    finally:
+        # Clean up temporary file
+        if temp_file and os.path.exists(temp_file):
+            try:
+                os.unlink(temp_file)
+            except Exception as e:
+                print(f"[ FATAL WARNING ]: Could not delete temp file {temp_file}: {e}")
+    
+    runtime = time.perf_counter() - start_time
+    
+    result = {
+        'passed': passed,
+        'output': output.strip() if output else '',
+        'runtime': runtime,
+        'error': error if not passed else None
+    }
+    
+    print(f"[ TEST RESULT ]: passed={passed}, runtime={runtime:.3f}s")
+    if error:
+        print(f"Error: {error}")
+    
+    return result

src/problems/Hashmaps/description.md

@@ -0,0 +1,50 @@
+## 🏷️ Problem: Lost & Found Office
+
+You are designing a system for a **Lost-and-Found office**.
+
+* People can **report lost items**, where each item is mapped to the owner’s name.
+* People can later **claim their item**.
+* If the item is not found, return `"No item found!"`.
+
+---
+
+### Function Signature
+
+```python
+class LostAndFound:
+    def __init__(self):
+        pass
+
+    def add_item(self, owner: str, item: str) -> None:
+        """
+        Stores the item with the owner's name.
+        """
+
+    def claim_item(self, owner: str) -> str:
+        """
+        Returns the owner's item if it exists, otherwise
+        returns 'No item found!'.
+        """
+```
+
+---
+
+### Example
+
+```python
+office = LostAndFound()
+office.add_item("Alice", "Umbrella")
+office.add_item("Bob", "Backpack")
+
+print(office.claim_item("Alice"))   # Output: "Umbrella"
+print(office.claim_item("Alice"))   # Output: "No item found!"
+print(office.claim_item("Charlie")) # Output: "No item found!"
+```
+
+---
+
+### Constraints
+
+* `1 <= len(owner), len(item) <= 100`
+* You may assume only **strings** are used for owner and item.
+* An owner can only have **one item** at a time.

src/problems/Hashmaps/manifest.json

@@ -0,0 +1,7 @@
+{
+    "title": "Hashmaps",
+    "description": "DSA - Hashmap. With Lost & Found",
+    "description_md": "problems/Hashmaps/description.md",
+    "test_code": "problems/Hashmaps/test.py",
+    "difficulty": "hard"
+}

src/problems/Hashmaps/test.py

@@ -0,0 +1,54 @@
+#class LostAndFound:
+#    def __init__(self):
+#        self.items = {}  # hashmap: owner -> item
+#
+#    def add_item(self, owner: str, item: str) -> None:
+#        self.items[owner] = item
+#
+#    def claim_item(self, owner: str) -> str:
+#        return self.items.pop(owner, "No item found!")
+    
+import unittest
+
+class TestLostAndFound(unittest.TestCase):
+    def test_basic(self):
+        office = LostAndFound()
+        office.add_item("Alice", "Umbrella")
+        office.add_item("Bob", "Backpack")
+
+        test_cases = [
+            ("Alice", "Umbrella", "First claim for Alice"),
+            ("Alice", "No item found!", "Alice claims again (should fail)"),
+            ("Charlie", "No item found!", "Charlie never added an item"),
+        ]
+
+        print("\nTEST: Basic LostAndFound Behavior")
+        for name, expected, description in test_cases:
+            try:
+                actual = office.claim_item(name)
+                status = "✓ PASS" if actual == expected else "✗ FAIL"
+                print(f"{status} | {description} | Input: {name} -> Got: {actual} | Expected: {expected}")
+                self.assertEqual(actual, expected)
+            except Exception as e:
+                print(f"✗ ERROR | {description} | Input: {name} -> Exception: {e}")
+                raise
+
+    def test_overwrite_item(self):
+        office = LostAndFound()
+        office.add_item("Bob", "Hat")
+        office.add_item("Bob", "Shoes")  # overwrite
+
+        print("\nTEST: Overwriting Items")
+        try:
+            actual = office.claim_item("Bob")
+            expected = "Shoes"
+            status = "✓ PASS" if actual == expected else "✗ FAIL"
+            print(f"{status} | Overwritten item claim | Input: Bob -> Got: {actual} | Expected: {expected}")
+            self.assertEqual(actual, expected)
+        except Exception as e:
+            print(f"✗ ERROR | Overwritten item claim | Input: Bob -> Exception: {e}")
+            raise
+
+
+if __name__ == "__main__":
+    unittest.main(verbosity=2)

src/problems/Palindrome/description.md

@@ -0,0 +1,60 @@
+## Problem: Check if a String is a Palindrome
+
+Given a string `s`, determine whether it reads the same forward and backward.
+Return `True` if it is a palindrome, otherwise return `False`.
+
+A **palindrome** is a sequence of characters that is identical when reversed.
+Comparison is **case-sensitive** and should consider all characters, including spaces and punctuation.
+
+---
+
+### Example 1
+
+**Input:**
+
+```
+s = "racecar"
+```
+
+**Output:**
+
+```
+True
+```
+
+**Explanation:**
+Reversing `"racecar"` results in `"racecar"`, which is the same as the original string.
+
+---
+
+### Example 2
+
+**Input:**
+
+```
+s = "hello"
+```
+
+**Output:**
+
+```
+False
+```
+
+**Explanation:**
+Reversing `"hello"` results in `"olleh"`, which is different from the original string.
+
+---
+
+### Constraints
+
+* `0 <= len(s) <= 10^5`
+* `s` may contain letters, digits, symbols, and spaces.
+
+---
+
+### Function Signature (Python)
+
+```python
+def palindrome(s: str) -> bool:
+```

src/problems/Palindrome/manifest.json

@@ -0,0 +1,7 @@
+{
+    "title": "Palindrome",
+    "description": "Find out wether or not a String is a Palindrome",
+    "description_md": "problems/Palindrome/description.md",
+    "test_code": "problems/Palindrome/test.py",
+    "difficulty": "medium"
+}

src/problems/Palindrome/test.py

@@ -0,0 +1,32 @@
+import unittest
+
+#<!-- User expected Function -->
+## def palindrome(s:str) -> bool:
+    ## return s == s[::-1]
+
+class TestSolution(unittest.TestCase):
+    def test_palindrome(self):
+        test_cases = [
+            ("racecar", True),          # Simple palindrome
+            ("hello", False),           # Not a palindrome
+            ("", True),                 # Empty string
+            ("a", True),                # Single character
+            ("madam", True),            # Palindrome word
+            ("Madam", False),           # Case-sensitive check
+            ("12321", True),            # Numeric string palindrome
+            ("123456", False),          # Numeric string non-palindrome
+        ]
+        print("\nFUNCTION OUTPUT TEST RESULTS")
+
+        for input_val, expected in test_cases:
+            try:
+                actual = palindrome(input_val)  # pyright: ignore[reportUndefinedVariable]
+                status = "✓ PASS" if actual == expected else "✗ FAIL"
+                print(f"{status} | Input: '{input_val}' -> Got: {actual} | Expected: {expected}")
+                self.assertEqual(actual, expected)
+            except Exception as e:
+                print(f"✗ ERROR | Input: '{input_val}' -> Exception: {e}")
+                raise
+
+if __name__ == "__main__":
+    unittest.main(verbosity=2)

src/problems/PrimeNumber/description.md

@@ -0,0 +1,90 @@
+# Prime Number Function Checker
+
+You are asked to **write a function** that checks if a number is a **prime number**.
+
+### What is a Prime Number?
+
+* A **prime number** is a whole number greater than `1`.
+* It has only **two divisors**: `1` and the number itself.
+* Example:
+
+  * `7` → Prime (divisible only by `1` and `7`)
+  * `8` → Not Prime (divisible by `1, 2, 4, 8`)
+
+Numbers less than or equal to `1` are **not prime**.
+
+📖 More info: [Wikipedia](https://en.wikipedia.org/wiki/Prime_number)
+
+---
+
+### Function Signature
+
+```python
+def check_prime(number: int) -> bool:
+```
+
+* **Input**:
+
+  * `number` → an integer
+
+* **Output**:
+
+  * `True` → if the number is prime
+  * `False` → if the number is not prime
+
+---
+
+### Example 1
+
+**Input:**
+
+```python
+check_prime(2)
+```
+
+**Output:**
+
+```
+True
+```
+
+---
+
+### Example 2
+
+**Input:**
+
+```python
+check_prime(4)
+```
+
+**Output:**
+
+```
+False
+```
+
+---
+
+### Example 3
+
+**Input:**
+
+```python
+check_prime(13)
+```
+
+**Output:**
+
+```
+True
+```
+
+---
+
+**_Dont worry you do NOT need to write these Function Calls into your solution. QPP checks automatically_**
+
+### Hint
+
+Try using the **modulo operator `%`** to check if one number divides evenly into another.
+If any number between `2` and `n-1` divides your number evenly, then it’s **not prime**.

src/problems/PrimeNumber/manifest.json

@@ -0,0 +1,7 @@
+{
+    "title": "Prime Number Checker",
+    "description": "Determine if a given number is a prime number",
+    "description_md": "problems/PrimeNumber/description.md",
+    "test_code": "problems/PrimeNumber/test.py",
+    "difficulty": "medium"
+}

src/problems/PrimeNumber/test.py

@@ -0,0 +1,33 @@
+import unittest
+
+
+# <!-- Function to check -->
+#       def check_prime(number : int) -> bool:
+    #       for i in range(2, int(number)):
+        #       if int(number) % i == 0:
+            #       return False
+    #       return True
+    
+class TestPrimeNumber(unittest.TestCase):
+    def test_prime_function(self):
+        test_cases = [
+            (2,True),
+            (3,True),
+            (4,False),
+            (6,False),
+            (1,False)
+        ]
+        print("\nFUNCTION OUTPUT TEST RESULTS")
+
+        for input_val, expected in test_cases:
+            try:
+                actual = check_prime(input_val)  
+                status = "✓ PASS" if actual == expected else "✗ FAIL"
+                print(f"{status} | Input: '{input_val}' -> Got: {actual} | Expected: {expected}")
+                self.assertEqual(actual, expected)
+            except Exception as e:
+                print(f"✗ ERROR | Input: '{input_val}' -> Exception: {e}")
+                raise
+
+if __name__ == "__main__":
+    unittest.main(verbosity=2)

src/problems/ReversedList/description.md

@@ -0,0 +1,44 @@
+## Reverse a List
+
+Write a function called `reverse_list` that takes a list as input and returns the list in reverse order.
+You are **allowed** to just use Python’s built-in `.reverse()` method or slicing (`[::-1]`), try to reverse it manually for practice.
+
+### Function Signature:
+
+```python
+def reverse_list(lst):
+  # your code here
+```
+
+### Requirements
+
+* The function should return a new list with the elements in reversed order.
+* The input list can contain:
+
+  * Numbers
+  * Strings
+  * Booleans
+  * A mix of different types
+* Your function will be tested with:
+
+  * A small list (e.g., `[1, 2, 3]` → `[3, 2, 1]`)
+  * A longer list (e.g., `[1, 2, 3, 4]` → `[4, 3, 2, 1]`)
+  * An empty list (should return an empty list)
+  * A single-element list (should return the same list)
+  * A mixed-type list (e.g., `[1, 'a', True]` → `[True, 'a', 1]`)
+
+### Example
+
+```python
+reverse_list([1, 2, 3])
+# Output: [3, 2, 1]
+
+reverse_list([])
+# Output: []
+
+reverse_list([5])
+# Output: [5]
+
+reverse_list([1, 'a', True])
+# Output: [True, 'a', 1]
+```

src/problems/ReversedList/manifest.json

@@ -0,0 +1,7 @@
+{
+    "title": "Reversed List",
+    "description": "Given a list, return a new list with the elements in reverse order.",
+    "description_md": "problems/reversedlist/description.md",
+    "difficulty": "easy",
+    "test_code": "problems/reversedlist/test.py"
+}

src/problems/ReversedList/test.py

@@ -0,0 +1,27 @@
+import unittest
+
+#def reverse_list(lst : list) -> list:
+    #return lst[::-1]
+
+class TestSolution(unittest.TestCase):
+    def test_simple(self):
+        test_cases = [
+            ([1, 2, 3], [3, 2, 1]),  # Simple case
+            ([1, 2, 3, 4], [4, 3, 2, 1]),  # Longer list
+            ([], []),  # Empty list
+            ([5], [5]),  # Single element list
+            ([1, 'a', True], [True, 'a', 1])  # Mixed types
+        ]
+        print("\n FUNCTION OUTPUT TEST RESULTS")
+
+        for input_val , expected in test_cases:
+            try:
+                actual = reverse_list(input_val)  # pyright: ignore[reportUndefinedVariable]
+                status = "✓ PASS" if actual == expected else "✗ FAIL"
+                print(f"{status} | Input: {input_val} -> Got: {actual} | Expected: {expected}")
+                self.assertEqual(actual, expected)
+            except Exception as e:
+                print(f"✗ ERROR | Input: {input_val} -> Exception: {e}")
+                raise
+if __name__ == "__main__":
+    unittest.main(verbosity=2)

src/problems/fibonacisequence/description.md

@@ -0,0 +1,40 @@
+## Fibonacci Number
+
+Write a function called `fibonacci` that takes a non-negative integer `n` as input and returns the **n-th Fibonacci number**.
+
+The Fibonacci sequence is defined as:
+
+* `F(0) = 0`
+* `F(1) = 1`
+* `F(n) = F(n-1) + F(n-2)` for `n > 1`
+
+### Function Signature:
+
+```python
+def fibonacci(n):
+    # return your solution
+```
+
+#### Requirements
+
+* The function should return the `n`-th number in the Fibonacci sequence.
+* If `n` is less than `0`, print `"Incorrect input"`.
+* Your function will be tested with:
+
+  * Base cases (`n = 0` and `n = 1`)
+  * Small values of `n`
+  * Larger values of `n` (e.g., 9)
+  * Multiple test cases in sequence
+
+#### Example:
+
+```python
+fibonacci(0)   # returns 0
+fibonacci(1)   # returns 1
+fibonacci(2)   # returns 1
+fibonacci(3)   # returns 2
+fibonacci(5)   # returns 5
+fibonacci(9)   # returns 34
+```
+
+You can copy this into your problem’s solution description.

src/problems/fibonacisequence/manifest.json

@@ -0,0 +1,7 @@
+{
+    "title": "Fibonacci Sequence",
+    "description": "Calculate the n-th Fibonacci number using a function. The Fibonacci sequence is defined as follows: F(0) = 0, F(1) = 1, and F(n) = F(n-1) + F(n-2) for n > 1.",
+    "description_md": "problems/fibonacisequence/description.md",
+    "difficulty": "medium",
+    "test_code": "problems/fibonacisequence/test.py"
+}

src/problems/fibonacisequence/test.py

@@ -0,0 +1,52 @@
+import unittest
+
+class TestSolution(unittest.TestCase):
+    def test_simple(self):
+        test_cases = [
+            (0, 0),     # Base case: n = 0
+            (1, 1),     # Base case: n = 1
+            (2, 1),     # Fibonacci(2) = 1
+            (3, 2),     # Fibonacci(3) = 2
+            (5, 5),     # Fibonacci(5) = 5
+            (9, 34),    # Fibonacci(9) = 34
+        ]
+        
+        print("\n=== Function Output Test Results ===")
+        for input_val, expected in test_cases:
+            try:
+                actual = fibonacci(input_val)  # pyright: ignore[reportUndefinedVariable]
+                status = "✓ PASS" if actual == expected else "✗ FAIL"
+                print(f"{status} | Input: {input_val} -> Got: {actual} | Expected: {expected}")
+                self.assertEqual(actual, expected)
+            except Exception as e:
+                print(f"✗ ERROR | Input: {input_val} -> Exception: {e}")
+                raise
+
+if __name__ == "__main__":
+    unittest.main(verbosity=2)
+
+"""
+def fibonacci(n):
+    a = 0
+    b = 1
+    
+    # Check if n is less than 0
+    if n < 0:
+        print("Incorrect input")
+        
+    # Check if n is equal to 0
+    elif n == 0:
+        return 0
+      
+    # Check if n is equal to 1
+    elif n == 1:
+        return b
+    else:
+        for i in range(1, n):
+            c = a + b
+            a = b
+            b = c
+        return b
+
+print(fibonacci(9))
+"""

src/problems/regex-phone/description.md

@@ -0,0 +1,58 @@
+# Phone Number Regular Expression Validation
+
+You are asked to write a function that checks if a given string is a valid phone number.
+
+A valid phone number must follow this format:
+
+```python
+123-456-7890
+```
+
+* It contains **3 digits**, followed by a **dash (-)**
+* Then another **3 digits**, followed by a **dash (-)**
+* Then exactly **4 digits**
+
+If the string matches this exact format, return **True**. Otherwise, return **False**.
+
+---
+
+### Example 1
+
+```python
+Input: "123-456-7890"
+Output: True
+```
+
+### Example 2
+
+```python
+Input: "1234567890"
+Output: False
+```
+
+### Example 3
+
+```python
+Input: "abc-def-ghij"
+Output: False
+```
+
+---
+
+### Function Signature
+
+```python
+import re
+
+def is_valid_phone_number(phone_number: str) -> bool:
+    return bool("Your Solution Here!")
+```
+
+---
+
+### Hint 🔑
+
+* Use the **`re`** (regular expression) library.
+* `\d` means “a digit” in regex.
+* You will need exactly **3 digits**, then a dash, then **3 digits**, another dash, then **4 digits**.
+* Anchors `^` (start of string) and `$` (end of string) can help ensure the whole string matches.

src/problems/regex-phone/manifest.json

@@ -0,0 +1,7 @@
+{
+    "title": "Regex Phonenumber",
+    "description": "A regex problem to match phone numbers in various formats.",
+    "description_md": "problems/regex-phone/description.md",
+    "difficulty": "hard",
+    "test_code": "problems/regex-phone/test.py"
+}

src/problems/regex-phone/test.py

@@ -0,0 +1,33 @@
+import re
+import unittest
+
+## def is_valid_phone_number(phone_number : str):
+    ## return bool(re.search(r"^(\d{3}-){2}\d{4}$", phone_number))
+
+import unittest
+
+class TestPhoneNumberRegex(unittest.TestCase):
+    def test_if_valid(self):
+        test_cases = [
+            ("123-456-7890", True),   # Valid format
+            ("111-222-3333", True),   # Another valid format
+            ("abc-def-ghij", False),  # Letters instead of digits
+            ("1234567890", False),    # Missing dashes
+            ("123-45-67890", False),  # Wrong grouping
+            ("12-3456-7890", False),  # Wrong grouping again
+            ("", False),              # Empty string
+        ]
+        print("\nPHONE NUMBER VALIDATION TEST RESULTS")
+
+        for phone, expected in test_cases:
+            try:
+                actual = is_valid_phone_number(phone)  # pyright: ignore[reportUndefinedVariable]
+                status = "✓ PASS" if actual == expected else "✗ FAIL"
+                print(f"{status} | Input: '{phone}' -> Got: {actual} | Expected: {expected}")
+                self.assertEqual(actual, expected)
+            except Exception as e:
+                print(f"✗ ERROR | Input: '{phone}' -> Exception: {e}")
+                raise
+
+if __name__ == "__main__":
+    unittest.main(verbosity=2)

src/problems/reversedstring/manifest.json

@@ -2,5 +2,6 @@
     "title":"Reversed String",
     "description":"Reverse a String using a Function ; Try to write as little code as possible",
     "description_md":"problems/reversedstring/description.md",
+    "difficulty":"easy",
     "test_code":"problems/reversedstring/test.py"
 }

src/problems/sortlist/description.md

@@ -0,0 +1,14 @@
+## Sorting a List
+
+In this example you are given a Task: **Sort a List of _say_ Apples**.
+
+## Function Signature:
+
+```python
+def sortlist(lst: list) -> list:
+    return # Your solution
+```
+
+Using the Type Inferrence gives you a Idea of what to return. You may freely choose to type or not to. The Python Interpreter does not care about Type Inferrence
+
+Sorting manually may be tedious. Look at the [PyDocs](https://docs.python.org/3/howto/sorting.html#sorting-basics)

src/problems/sortlist/manifest.json

@@ -2,5 +2,6 @@
   "title": "Sort List",
   "description": "Sort a List with a Function (sortlist); the function is supposed to take the list as an argument and is supposed to return the sorted list and print it.",
   "description_md": "problems/sortlist/description.md",
+  "difficulty": "easy",
   "test_code": "problems/sortlist/test.py"
 }

src/problems/sortlist/test.py

@@ -0,0 +1,26 @@
+import unittest
+
+#def sortlist(lst = [4,3,2,1]) -> list:
+    #return sorted(lst)
+
+class TestSolution(unittest.TestCase):
+    def test_sort(self):
+        test_cases=[
+            ([3,2,1],[1,2,3]),
+            ([4,3,2,1],[1,2,3,4])
+        ]
+
+        print("\n Function Output Test Results: ")
+        for input_val, expected in test_cases:
+            try:
+                actual = sortlist(input_val) # pyright: ignore[reportUndefinedVariable]
+                status = "PASS" if actual == expected else "FAIL"
+                print(f"{status} | Input: '{input_val}' -> Got: '{actual}' | Expected: '{expected}'")
+                self.assertEqual(actual,expected)
+            except Exception as e:
+                print(f"ERROR | Input: '{input_val}' -> Exception: {e}")
+                raise
+
+
+if __name__ == "__main__":
+    unittest.main(verbosity=2)

src/static/index.css

@@ -0,0 +1,326 @@
+:root {
+    --bg: #f6f8fb;
+    --card: #fff;
+    --text: #0f172a;
+    --muted: #6b7280;
+    --accent: #2563eb;
+    --border: #e5e7eb;
+    --hover: #f3f4f6;
+    --shadow: 0 4px 12px rgba(16, 24, 40, 0.06);
+    --radius: 8px;
+    --mono: "JetBrains Mono", monospace;
+}
+
+/* Dark mode variables */
+html.dark {
+    --bg: #0f172a;
+    --card: #1e293b;
+    --text: #f1f5f9;
+    --muted: #94a3b8;
+    --accent: #3b82f6;
+    --border: #334155;
+    --hover: #334155;
+    --shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
+}
+* {
+    box-sizing: border-box;
+    margin: 0;
+    padding: 0;
+}
+html,
+body {
+    height: 100%;
+}
+body {
+    font-family: Inter, sans-serif;
+    background: var(--bg);
+    color: var(--text);
+    padding: 16px;
+    display: flex;
+    justify-content: center;
+    align-items: center;
+    transition:
+        background-color 0.3s ease,
+        color 0.3s ease;
+}
+.wrap {
+    width: 100%;
+    max-width: 1100px;
+}
+header {
+    margin-bottom: 14px;
+}
+.header-content {
+    display: flex;
+    justify-content: center;
+    align-items: center;
+    position: relative;
+}
+header h1 {
+    text-align: center;
+    font-size: 1.6rem;
+    color: var(--text);
+}
+header p {
+    color: var(--muted);
+    font-size: 0.9rem;
+}
+.dark-mode-toggle {
+    position: absolute;
+    right: 0;
+    background: none;
+    border: 1px solid var(--border);
+    border-radius: var(--radius);
+    padding: 6px 10px;
+    cursor: pointer;
+    color: var(--text);
+    font-size: 1.2rem;
+    transition: all 0.3s ease;
+}
+.dark-mode-toggle:hover {
+    background: var(--hover);
+    transform: scale(1.05);
+}
+html.dark .dark-mode-icon::before {
+    content: "☀︎️";
+}
+html:not(.dark) .dark-mode-icon::before {
+    content: "⏾";
+}
+.dark-mode-icon {
+    display: inline-block;
+}
+.dark-mode-icon::before {
+    font-size: 1em;
+}
+.content {
+    display: grid;
+    grid-template-columns: 1fr 1fr;
+    gap: 12px;
+}
+.content.single-column {
+    grid-template-columns: 1fr;
+}
+.card {
+    background: var(--card);
+    border-radius: var(--radius);
+    box-shadow: var(--shadow);
+    padding: 12px;
+}
+/* Search/filter controls */
+.search-controls {
+    margin-bottom: 12px;
+    display: flex;
+    gap: 8px;
+}
+.search-input {
+    flex: 1;
+    padding: 6px 10px;
+    border: 1px solid var(--border);
+    border-radius: 4px;
+    font-size: 0.9rem;
+    background: var(--card);
+    color: var(--text);
+    transition: border-color 0.3s ease;
+}
+.search-input:focus {
+    outline: none;
+    border-color: var(--accent);
+}
+.filter-select {
+    padding: 6px 8px;
+    border: 1px solid var(--border);
+    border-radius: 4px;
+    font-size: 0.9rem;
+    background: var(--card);
+    color: var(--text);
+    transition: border-color 0.3s ease;
+}
+.filter-select:focus {
+    outline: none;
+    border-color: var(--accent);
+}
+/* Problems list */
+.problems-list .problem-item {
+    padding: 8px;
+    border-bottom: 1px solid var(--border);
+    display: flex;
+    justify-content: space-between;
+    align-items: center;
+    transition: background-color 0.3s ease;
+}
+.problem-item:hover {
+    background: var(--hover);
+}
+.problem-item:last-child {
+    border-bottom: none;
+}
+.problem-item a {
+    text-decoration: none;
+    color: var(--accent);
+    font-weight: 600;
+    transition: color 0.3s ease;
+}
+.problem-item a:hover {
+    text-decoration: underline;
+}
+/* Difficulty badge */
+.difficulty {
+    display: inline-flex;
+    align-items: center;
+    padding: 0.25em 0.6em;
+    border-radius: 10px;
+    font-size: 0.85em;
+    font-weight: bold;
+    text-transform: uppercase;
+    color: white;
+    white-space: nowrap;
+}
+.difficulty[data-difficulty="easy"] {
+    background-color: #4caf50; /* Green */
+}
+.difficulty[data-difficulty="medium"] {
+    background-color: #ffc107; /* Amber */
+    color: #333;
+}
+.difficulty[data-difficulty="hard"] {
+    background-color: #f44336; /* Red */
+}
+/* Leaderboard */
+.leaderboard-head {
+    display: flex;
+    justify-content: space-between;
+    align-items: center;
+    margin-bottom: 6px;
+}
+.leaderboard-controls {
+    display: flex;
+    gap: 8px;
+    margin-bottom: 12px;
+}
+.leaderboard-table {
+    width: 100%;
+    border-collapse: collapse;
+    font-size: 0.9rem;
+}
+.leaderboard-table th,
+.leaderboard-table td {
+    padding: 6px 8px;
+    border-bottom: 1px solid var(--border);
+    text-align: left;
+}
+.leaderboard-table th {
+    background: var(--hover);
+    font-weight: 600;
+    color: var(--muted);
+}
+.leaderboard-table tr:hover {
+    background: var(--hover);
+}
+/* Sort indicators */
+.sortable {
+    cursor: pointer;
+    position: relative;
+    padding-right: 16px;
+}
+.sortable::after {
+    content: "↕";
+    position: absolute;
+    right: 4px;
+    top: 50%;
+    transform: translateY(-50%);
+    font-size: 0.8em;
+    opacity: 0.5;
+}
+.sort-asc::after {
+    content: "↑";
+    opacity: 1;
+}
+.sort-desc::after {
+    content: "↓";
+    opacity: 1;
+}
+/* Toggle button */
+.btn {
+    border: none;
+    background: transparent;
+    cursor: pointer;
+    color: var(--accent);
+    font-size: 0.85rem;
+    padding: 4px 6px;
+    border-radius: 4px;
+}
+.btn:hover {
+    background: rgba(37, 99, 235, 0.08);
+}
+.btn.active {
+    background: rgba(37, 99, 235, 0.15);
+}
+@media (max-width: 800px) {
+    .content {
+        grid-template-columns: 1fr;
+    }
+    .leaderboard-controls {
+        flex-direction: column;
+    }
+}
+
+/* Leaderboard horizontal collapse */
+#leaderboardSection {
+    transition:
+        max-width 0.35s ease,
+        opacity 0.25s ease;
+    overflow: hidden;
+    max-width: 100%;
+}
+
+#leaderboardSection.hidden {
+    max-width: 0;
+    opacity: 0;
+    pointer-events: none;
+}
+
+#leaderboardSection.visible {
+    max-width: 100%; /* take full available space in grid column */
+    opacity: 1;
+}
+#rankingExplanation {
+    transition: all 0.35s ease;
+}
+
+/* Pagination Controls */
+.pagination-controls {
+    display: flex;
+    justify-content: space-between;
+    align-items: center;
+    margin-top: 12px;
+    padding-top: 12px;
+    border-top: 1px solid var(--border);
+}
+.pagination-btn {
+    background: var(--card);
+    border: 1px solid var(--border);
+    border-radius: 4px;
+    padding: 6px 12px;
+    cursor: pointer;
+    color: var(--text);
+    font-size: 0.9rem;
+    transition: all 0.3s ease;
+}
+.pagination-btn:hover:not(:disabled) {
+    background: var(--hover);
+    border-color: var(--accent);
+}
+.pagination-btn:disabled {
+    opacity: 0.5;
+    cursor: not-allowed;
+}
+.pagination-info {
+    color: var(--muted);
+    font-size: 0.9rem;
+}
+
+/* Hide pagination when not needed */
+.pagination-controls.hidden {
+    display: none;
+}

src/static/problem.css

@@ -0,0 +1,296 @@
+:root {
+    --bg: #f9f9f9;
+    --card: #fff;
+    --text: #333;
+    --muted: #666;
+    --accent: #007bff;
+    --accent-hover: #0069d9;
+    --border: #eaeaea;
+    --hover: #f8f9fa;
+    --code-bg: #f6f8fa;
+    --editor-border: #ddd;
+}
+
+html.dark {
+    --bg: #0f172a;
+    --card: #1e293b;
+    --text: #f1f5f9;
+    --muted: #94a3b8;
+    --accent: #3b82f6;
+    --accent-hover: #2563eb;
+    --border: #334155;
+    --hover: #334155;
+    --code-bg: #1e293b;
+    --editor-border: #475569;
+}
+
+body {
+    font-family: "Inter", sans-serif;
+    margin: 0;
+    padding: 0;
+    background-color: var(--bg);
+    color: var(--text);
+    min-height: 100vh; /* allow content to grow */
+    overflow-y: auto; /* allow vertical scroll */
+    box-sizing: border-box;
+    transition:
+        background-color 0.3s ease,
+        color 0.3s ease;
+}
+
+*,
+*::before,
+*::after {
+    box-sizing: inherit;
+}
+
+.main-container {
+    display: flex;
+    flex-wrap: wrap; /* wrap on small screens */
+    min-height: 100vh;
+    width: 100vw;
+}
+
+.problem-panel {
+    flex: 1 1 400px; /* grow/shrink with base 400px */
+    min-width: 300px;
+    background: var(--card);
+    overflow-y: auto;
+    padding: 20px;
+    border-right: 1px solid var(--border);
+    max-height: 100vh;
+    transition: background-color 0.3s ease;
+}
+
+.editor-container {
+    flex: 1 1 400px;
+    min-width: 300px;
+    display: flex;
+    flex-direction: column;
+    background: var(--card);
+    max-height: 100vh;
+    overflow: hidden; /* internal scroll handling */
+    transition: background-color 0.3s ease;
+}
+
+.editor-header {
+    padding: 15px 20px;
+    border-bottom: 1px solid var(--border);
+    flex-shrink: 0;
+}
+
+.editor-wrapper {
+    flex: 1 1 auto;
+    display: flex;
+    flex-direction: column;
+    min-height: 0;
+    padding: 0 20px;
+    overflow-y: auto;
+}
+
+.problem-header {
+    display: flex;
+    align-items: center;
+    justify-content: space-between;
+    margin-bottom: 20px;
+}
+
+.back-btn {
+    background: none;
+    border: 1px solid var(--border);
+    border-radius: 4px;
+    cursor: pointer;
+    font-size: 16px;
+    color: var(--muted);
+    margin-right: 15px;
+    padding: 6px 10px;
+    transition: all 0.3s ease;
+}
+
+.back-btn:hover {
+    color: var(--text);
+    background: var(--hover);
+}
+
+.dark-mode-toggle {
+    background: none;
+    border: 1px solid var(--border);
+    border-radius: 4px;
+    padding: 6px 10px;
+    cursor: pointer;
+    color: var(--text);
+    font-size: 1.2rem;
+    transition: all 0.3s ease;
+}
+
+.dark-mode-toggle:hover {
+    background: var(--hover);
+    transform: scale(1.05);
+}
+
+html.dark .dark-mode-icon::before {
+    content: "☀";
+}
+
+html:not(.dark) .dark-mode-icon::before {
+    content: "⏾";
+}
+
+.dark-mode-icon {
+    display: inline-block;
+}
+
+.dark-mode-icon::before {
+    font-size: 1em;
+}
+
+h1 {
+    font-size: 22px;
+    font-weight: 600;
+    margin: 0;
+    color: var(--text);
+    flex: 1;
+}
+
+.problem-desc {
+    line-height: 1.6;
+    font-size: 15px;
+    overflow-wrap: break-word;
+}
+
+.problem-desc pre {
+    background: var(--code-bg);
+    padding: 12px;
+    border-radius: 4px;
+    overflow-x: auto;
+    font-family: "JetBrains Mono", monospace;
+    font-size: 14px;
+    border: 1px solid var(--border);
+}
+
+.problem-desc code {
+    background: var(--code-bg);
+    padding: 2px 4px;
+    border-radius: 3px;
+    font-family: "JetBrains Mono", monospace;
+    font-size: 14px;
+}
+
+.editor-actions {
+    padding: 15px 0;
+    display: flex;
+    justify-content: flex-end;
+    flex-shrink: 0;
+}
+
+.editor-actions button {
+    background-color: var(--accent);
+    color: white;
+    border: none;
+    padding: 8px 16px;
+    border-radius: 4px;
+    cursor: pointer;
+    font-weight: 500;
+    font-size: 14px;
+    transition: background-color 0.3s ease;
+}
+
+.editor-actions button:hover {
+    background-color: var(--accent-hover);
+}
+
+#editor {
+    flex: 1 1 auto;
+    min-height: 300px;
+    border: 1px solid var(--editor-border);
+    border-radius: 4px;
+    overflow: auto;
+    max-height: 60vh;
+}
+
+.result-panel {
+    margin-top: 20px;
+    padding: 15px;
+    background: var(--hover);
+    border-radius: 4px;
+    margin-bottom: 20px;
+    min-height: 120px;
+    overflow-y: auto;
+    max-height: 30vh;
+    border: 1px solid var(--border);
+    transition: background-color 0.3s ease;
+}
+
+.result-panel h3 {
+    margin-top: 0;
+    font-size: 16px;
+    margin-bottom: 10px;
+}
+
+.result-panel pre {
+    background: var(--code-bg);
+    padding: 12px;
+    border-radius: 4px;
+    overflow-x: auto;
+    white-space: pre-wrap;
+    font-family: "JetBrains Mono", monospace;
+    font-size: 14px;
+    margin: 5px 0;
+    border: 1px solid var(--border);
+}
+
+.placeholder {
+    color: var(--muted);
+    font-style: italic;
+    text-align: center;
+    padding: 20px;
+}
+
+label {
+    display: block;
+    margin-bottom: 5px;
+    font-size: 14px;
+    color: var(--muted);
+}
+
+input[type="text"] {
+    width: 100%;
+    padding: 8px;
+    border: 1px solid var(--border);
+    border-radius: 4px;
+    margin-bottom: 15px;
+    font-family: "Inter", sans-serif;
+    background: var(--card);
+    color: var(--text);
+    transition: border-color 0.3s ease;
+}
+
+input[type="text"]:focus {
+    outline: none;
+    border-color: var(--accent);
+}
+
+/* Responsive adjustments */
+@media (max-width: 768px) {
+    .main-container {
+        flex-direction: column;
+        height: auto;
+        overflow-y: visible;
+    }
+    .problem-panel,
+    .editor-container {
+        flex: none;
+        width: 100%;
+        min-width: auto;
+        max-height: none;
+        border-right: none;
+        border-bottom: 1px solid var(--border);
+    }
+    #editor {
+        min-height: 400px;
+        max-height: none;
+    }
+    .result-panel {
+        max-height: none;
+    }
+}

src/static/style.css

@@ -1,260 +1,317 @@
-/* Reset and base styles */
-* {
-    margin: 0;
-    padding: 0;
-    box-sizing: border-box;
-}
-
-body {
-    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
-    line-height: 1.6;
-    color: #333;
-    background-color: #f8f9fa;
-    padding: 20px;
-    max-width: 1200px;
-    margin: 0 auto;
-}
-
-/* Main heading */
-h1 {
-    color: #2c3e50;
-    margin-bottom: -10px;
-    padding-bottom: 3px;
-    border-bottom: 3px solid #3498db;
-    font-size: 2.2em;
-}
-
-h2 {
-    color: #34495e;
-    margin: 30px 0 20px 0;
-    font-size: 1.5em;
-}
-
-h3 {
-    color: #34495e;
-    margin: 25px 0 15px 0;
-    font-size: 1.3em;
-}
-
-/* Links and buttons */
-a {
-    color: #3498db;
-    text-decoration: none;
-    padding: 8px 16px;
-    border-radius: 5px;
-    transition: background-color 0.3s ease;
-}
-
-a:hover {
-    background-color: #e3f2fd;
-    text-decoration: none;
-}
-
-/* Primary action link (Submit New Problem) */
-a[href="/problem/new"] {
-    background-color: #3498db;
-    color: white;
-    font-weight: 600;
-    margin-bottom: 30px;
-    display: inline-block;
-    padding: 12px 24px;
-    border-radius: 8px;
-}
-
-a[href="/problem/new"]:hover {
-    background-color: #2980b9;
-}
-
-/* Problem list */
-ul {
-    list-style: none;
-    background: white;
-    border-radius: 8px;
-    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
-    padding: 25px;
-    margin: 20px 0;
-}
-
-li {
-    padding: 15px 0;
-    border-bottom: 1px solid #eee;
-}
-
-li:last-child {
-    border-bottom: none;
-}
-
-li a {
-    display: block;
-    padding: 12px 20px;
-    margin: -12px -20px;
-    border-radius: 6px;
-    font-size: 1.1em;
-}
-
-li a:hover {
-    background-color: #f8f9fa;
-    transform: translateX(5px);
-    transition: all 0.2s ease;
-}
-
-/* Problem page specific styles */
-.problem-header {
-    display: flex;
-    align-items: center;
-    margin-bottom: 30px;
-    gap: 20px;
-}
-
-.back-btn {
-    background-color: #95a5a6;
-    color: white;
-    border: none;
-    padding: 10px 20px;
-    border-radius: 6px;
-    cursor: pointer;
-    font-size: 14px;
-    font-weight: 500;
-    transition: background-color 0.3s ease;
-}
-
-.back-btn:hover {
-    background-color: #7f8c8d;
-}
-
-.problem-desc {
-    background: white;
-    padding: 30px;
-    border-radius: 8px;
-    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
-    margin-bottom: 30px;
-    font-size: 1.1em;
-    line-height: 1.7;
-}
-
-/* Editor section */
-.editor-section {
-    background: white;
-    padding: 30px;
-    border-radius: 8px;
-    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
-    margin-bottom: 30px;
-}
-
-#editor {
-    border: 2px solid #ddd;
-    border-radius: 8px;
-    margin: 20px 0;
-    height: 400px;
-    overflow: hidden;
-}
-
-.editor-actions {
-    margin-top: 20px;
-    text-align: right;
-}
-
-form button[type="submit"] {
-    background-color: #27ae60;
-    color: white;
-    border: none;
-    padding: 12px 30px;
-    border-radius: 8px;
-    cursor: pointer;
-    font-size: 16px;
-    font-weight: 600;
-    transition: background-color 0.3s ease;
-}
-
-form button[type="submit"]:hover {
-    background-color: #229954;
-}
-
-/* Results section */
-b {
-    color: #2c3e50;
-    display: inline-block;
-    margin: 10px 0 5px 0;
-}
-
-pre {
-    background-color: #f4f4f4;
-    padding: 20px;
-    border-radius: 6px;
-    border-left: 4px solid #3498db;
-    margin: 10px 0 20px 0;
-    overflow-x: auto;
-    font-family: 'JetBrains Mono', 'Courier New', monospace;
-    font-size: 14px;
-    line-height: 1.4;
-}
-
-pre[style*="color:red"] {
-    border-left-color: #e74c3c;
-    background-color: #fdf2f2;
-}
-
-/* Status messages */
-p[style*="color:green"] {
-    background-color: #d4edda;
-    color: #155724;
-    padding: 15px 20px;
-    border-radius: 6px;
-    border-left: 4px solid #27ae60;
-    margin: 20px 0;
-    font-weight: 600;
-}
-
-p[style*="color:red"] {
-    background-color: #f8d7da;
-    color: #721c24;
-    padding: 15px 20px;
-    border-radius: 6px;
-    border-left: 4px solid #e74c3c;
-    margin: 20px 0;
-    font-weight: 600;
-}
-
-/* Back to Problems link */
-a[href="/"] {
-    display: inline-block;
-    margin-top: 30px;
-    background-color: #6c757d;
-    color: white;
-    padding: 10px 20px;
-    border-radius: 6px;
-    font-weight: 500;
-}
-
-a[href="/"]:hover {
-    background-color: #5a6268;
-}
-
-/* Responsive design */
-@media (max-width: 768px) {
-    body {
-        padding: 15px;
-    }
-    
-    .problem-header {
-        flex-direction: column;
-        align-items: flex-start;
-        gap: 15px;
-    }
-    
-    h1 {
-        font-size: 1.8em;
-    }
-    
-    .problem-desc, .editor-section, ul {
-        padding: 20px;
-    }
-    
-    #editor {
-        height: 300px;
-    }
-    
-    .editor-actions {
-        text-align: center;
-    }
-}
+:root {
+    --bg: #f8f9fa;
+    --card: #fff;
+    --text: #333;
+    --heading: #2c3e50;
+    --heading-secondary: #34495e;
+    --accent: #3498db;
+    --accent-hover: #2980b9;
+    --success: #27ae60;
+    --success-hover: #229954;
+    --error: #e74c3c;
+    --muted: #6c757d;
+    --muted-hover: #5a6268;
+    --border: #ddd;
+    --code-bg: #f4f4f4;
+    --success-bg: #d4edda;
+    --success-text: #155724;
+    --error-bg: #f8d7da;
+    --error-text: #721c24;
+    --hover-bg: #e3f2fd;
+    --shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
+}
+
+html.dark {
+    --bg: #0f172a;
+    --card: #1e293b;
+    --text: #f1f5f9;
+    --heading: #3b82f6;
+    --heading-secondary: #94a3b8;
+    --accent: #3b82f6;
+    --accent-hover: #2563eb;
+    --success: #22c55e;
+    --success-hover: #16a34a;
+    --error: #ef4444;
+    --muted: #64748b;
+    --muted-hover: #475569;
+    --border: #334155;
+    --code-bg: #1e293b;
+    --success-bg: #065f46;
+    --success-text: #d1fae5;
+    --error-bg: #7f1d1d;
+    --error-text: #fecaca;
+    --hover-bg: #1e40af;
+    --shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
+}
+
+/* Reset and base styles */
+* {
+    margin: 0;
+    padding: 0;
+    box-sizing: border-box;
+}
+
+body {
+    font-family:
+        -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
+    line-height: 1.6;
+    color: var(--text);
+    background-color: var(--bg);
+    padding: 20px;
+    max-width: 1200px;
+    margin: 0 auto;
+    transition:
+        background-color 0.3s ease,
+        color 0.3s ease;
+}
+
+/* Main heading */
+h1 {
+    color: var(--heading);
+    margin-bottom: -10px;
+    padding-bottom: 3px;
+    border-bottom: 3px solid var(--accent);
+    font-size: 2.2em;
+}
+
+h2 {
+    color: var(--heading-secondary);
+    margin: 30px 0 20px 0;
+    font-size: 1.5em;
+}
+
+h3 {
+    color: var(--heading-secondary);
+    margin: 25px 0 15px 0;
+    font-size: 1.3em;
+}
+
+/* Links and buttons */
+a {
+    color: var(--accent);
+    text-decoration: none;
+    padding: 8px 16px;
+    border-radius: 5px;
+    transition: background-color 0.3s ease;
+}
+
+a:hover {
+    background-color: var(--hover-bg);
+    text-decoration: none;
+}
+
+/* Primary action link (Submit New Problem) */
+a[href="/problem/new"] {
+    background-color: var(--accent);
+    color: white;
+    font-weight: 600;
+    margin-bottom: 30px;
+    display: inline-block;
+    padding: 12px 24px;
+    border-radius: 8px;
+}
+
+a[href="/problem/new"]:hover {
+    background-color: var(--accent-hover);
+}
+
+/* Problem list */
+ul {
+    list-style: none;
+    background: var(--card);
+    border-radius: 8px;
+    box-shadow: var(--shadow);
+    padding: 25px;
+    margin: 20px 0;
+    transition: background-color 0.3s ease;
+}
+
+li {
+    padding: 15px 0;
+    border-bottom: 1px solid var(--border);
+}
+
+li:last-child {
+    border-bottom: none;
+}
+
+li a {
+    display: block;
+    padding: 12px 20px;
+    margin: -12px -20px;
+    border-radius: 6px;
+    font-size: 1.1em;
+}
+
+li a:hover {
+    background-color: var(--hover-bg);
+    transform: translateX(5px);
+    transition: all 0.2s ease;
+}
+
+/* Problem page specific styles */
+.problem-header {
+    display: flex;
+    align-items: center;
+    margin-bottom: 30px;
+    gap: 20px;
+}
+
+.back-btn {
+    background-color: var(--muted);
+    color: white;
+    border: none;
+    padding: 10px 20px;
+    border-radius: 6px;
+    cursor: pointer;
+    font-size: 14px;
+    font-weight: 500;
+    transition: background-color 0.3s ease;
+}
+
+.back-btn:hover {
+    background-color: var(--muted-hover);
+}
+
+.problem-desc {
+    background: var(--card);
+    padding: 30px;
+    border-radius: 8px;
+    box-shadow: var(--shadow);
+    margin-bottom: 30px;
+    font-size: 1.1em;
+    line-height: 1.7;
+    transition: background-color 0.3s ease;
+}
+
+/* Editor section */
+.editor-section {
+    background: var(--card);
+    padding: 30px;
+    border-radius: 8px;
+    box-shadow: var(--shadow);
+    margin-bottom: 30px;
+    transition: background-color 0.3s ease;
+}
+
+#editor {
+    border: 2px solid var(--border);
+    border-radius: 8px;
+    margin: 20px 0;
+    height: 400px;
+    overflow: hidden;
+}
+
+.editor-actions {
+    margin-top: 20px;
+    text-align: right;
+}
+
+form button[type="submit"] {
+    background-color: var(--success);
+    color: white;
+    border: none;
+    padding: 12px 30px;
+    border-radius: 8px;
+    cursor: pointer;
+    font-size: 16px;
+    font-weight: 600;
+    transition: background-color 0.3s ease;
+}
+
+form button[type="submit"]:hover {
+    background-color: var(--success-hover);
+}
+
+/* Results section */
+b {
+    color: var(--heading);
+    display: inline-block;
+    margin: 10px 0 5px 0;
+}
+
+pre {
+    background-color: var(--code-bg);
+    padding: 20px;
+    border-radius: 6px;
+    border-left: 4px solid var(--accent);
+    margin: 10px 0 20px 0;
+    overflow-x: auto;
+    font-family: "JetBrains Mono", "Courier New", monospace;
+    font-size: 14px;
+    line-height: 1.4;
+    border: 1px solid var(--border);
+    transition: background-color 0.3s ease;
+}
+
+pre[style*="color:red"] {
+    border-left-color: var(--error);
+    background-color: var(--error-bg);
+}
+
+/* Status messages */
+p[style*="color:green"] {
+    background-color: var(--success-bg);
+    color: var(--success-text);
+    padding: 15px 20px;
+    border-radius: 6px;
+    border-left: 4px solid var(--success);
+    margin: 20px 0;
+    font-weight: 600;
+}
+
+p[style*="color:red"] {
+    background-color: var(--error-bg);
+    color: var(--error-text);
+    padding: 15px 20px;
+    border-radius: 6px;
+    border-left: 4px solid var(--error);
+    margin: 20px 0;
+    font-weight: 600;
+}
+
+/* Back to Problems link */
+a[href="/"] {
+    display: inline-block;
+    margin-top: 30px;
+    background-color: var(--muted);
+    color: white;
+    padding: 10px 20px;
+    border-radius: 6px;
+    font-weight: 500;
+}
+
+a[href="/"]:hover {
+    background-color: var(--muted-hover);
+}
+
+/* Responsive design */
+@media (max-width: 768px) {
+    body {
+        padding: 15px;
+    }
+
+    .problem-header {
+        flex-direction: column;
+        align-items: flex-start;
+        gap: 15px;
+    }
+
+    h1 {
+        font-size: 1.8em;
+    }
+
+    .problem-desc,
+    .editor-section,
+    ul {
+        padding: 20px;
+    }
+
+    #editor {
+        height: 300px;
+    }
+
+    .editor-actions {
+        text-align: center;
+    }
+}

src/templates/index.html

@@ -0,0 +1,166 @@
+<!doctype html>
+<html lang="en" class="">
+<head>
+<script>
+  /*
+      This fix is for the fucking epileptics. idk what they're called.
+      It fixes the fucking flashing between changing pages.
+      This is both in the problems and this file
+      ---
+      This changes nothing if the user uses light-system
+  */
+  (function() {
+    try {
+      var dark = localStorage.getItem("darkMode");
+      if (
+        dark === "true" ||
+        (dark === null && window.matchMedia("(prefers-color-scheme: dark)").matches)
+      ) {
+        document.documentElement.classList.add("dark");
+      }
+    } catch (e) {}
+  })();
+</script>
+<meta charset="utf-8" />
+<meta name="viewport" content="width=device-width,initial-scale=1" />
+<title>Quick Problem Platform</title>
+<link rel="icon" type="image/x-icon" href="{{ url_for('static', filename='favicon.ico') }}">
+<link rel="stylesheet" href="{{ url_for('static', filename='index.css') }}">
+</head>
+<style>
+/* Popout explanation */
+#rankingExplanation {
+  grid-column: 1 / span 2;
+  max-height: 0;
+  opacity: 0;
+  overflow: hidden;
+  transition: max-height 0.5s ease, opacity 0.4s ease, padding 0.4s ease;
+  padding: 0 12px;
+}
+#rankingExplanation.active {
+  max-height: 800px;
+  opacity: 1;
+  padding: 12px;
+}
+#rankInfoBtn.active { color: #2563eb; cursor:pointer; transition: transform 0.3s ease; }
+#rankInfoBtn.active { transform: rotate(90deg); }
+
+/* Highlight top rank */
+.rank-1 td:first-child { font-weight: bold; }
+.sort-asc::after { content: " ↑"; }
+.sort-desc::after { content: " ↓"; }
+</style>
+</head>
+<body>
+<div class="wrap">
+  <header>
+    <div class="header-content">
+      <h1>Quick Problem Platform</h1>
+      <button id="darkModeToggle" class="dark-mode-toggle" title="Toggle dark mode">
+        <span class="dark-mode-icon"></span>
+      </button>
+    </div>
+  </header>
+  <div class="content" id="contentContainer">
+    <!-- Problems -->
+    <section class="card problems-list">
+      <div class="search-controls">
+        <input type="text" class="search-input" id="problemSearch" placeholder="Search problems..." />
+      </div>
+      <h2 style="margin-bottom:6px;font-size:1.1rem">Problems</h2>
+      <div id="problemsContainer">
+        {% for folder, description, test_code, difficulty in problems %}
+          <div class="problem-item" data-name="{{ folder.replace('_',' ').title() }}" data-desc="{{ description }}" data-difficulty="{{ difficulty|lower }}">
+            <a href="/problem/{{ folder }}">{{ folder.replace('_',' ').title() }}</a>
+            <span class="difficulty" data-difficulty="{{ difficulty|lower }}">{{ difficulty }}</span>
+          </div>
+        {% else %}
+          <div class="problem-item">No problems yet.</div>
+        {% endfor %}
+      </div>
+      <div class="pagination-controls" id="problemsPagination">
+        <button class="pagination-btn" id="problemsPrevBtn" disabled>← Previous</button>
+        <span class="pagination-info" id="problemsPaginationInfo">Page 1 of 1</span>
+        <button class="pagination-btn" id="problemsNextBtn" disabled>Next →</button>
+      </div>
+    </section>
+
+    <!-- Leaderboard -->
+    <section class="card" id="leaderboardSection">
+      <div class="leaderboard-head">
+        <h2 style="font-size:1.1rem;margin:0">Leaderboard
+          <!--<span id="rankInfoBtn" title="How ranking works">ℹ️</span>-->
+        </h2>
+      </div>
+      <div class="leaderboard-controls">
+        <input type="text" class="search-input" id="problemFilter" placeholder="Filter by problem..." />
+        <select class="filter-select" id="runtimeFilter">
+          <option value="">All runtimes</option>
+          <option value="best">Best runtime</option>
+          <option value="worst">Worst runtime</option>
+        </select>
+      </div>
+      <div id="leaderboardContainer">
+        <table class="leaderboard-table">
+          <thead>
+            <tr>
+              <th class="sortable" data-sort="rank">Rank</th>
+              <th class="sortable" data-sort="user">User</th>
+              <th class="sortable" data-sort="problem">Problem</th>
+              <th class="sortable" data-sort="runtime">Runtime (s)</th>
+              <th class="sortable" data-sort="memory">Memory (KB)</th>
+              <th>Line</th>
+              <th class="sortable" data-sort="timestamp">Timestamp</th>
+            </tr>
+          </thead>
+          <tbody id="leaderboardBody">
+            {% for entry in leaderboard %}
+            <tr data-user="{{ entry[0] }}" data-problem="{{ problem_titles.get(entry[1], 'Unknown') }}"
+                data-runtime="{{ '%.4f'|format(entry[2]) }}" data-memory="{{ entry[3] }}"
+                data-timestamp="{{ entry[5] }}">
+              <td>{{ loop.index }}</td>
+              <td>{{ entry[0] }}</td>
+              <td>
+                <a href="/problem/{{ problem_titles.get(entry[1], 'Unknown') }}"
+                  style="color:#2563eb; text-decoration: none;"
+                  onmouseover="this.style.textDecoration='underline';"
+                  onmouseout="this.style.textDecoration='none';">
+                  {{ problem_titles.get(entry[1], 'Unknown') }}
+                </a>
+              </td>
+              <td>{{ '%.4f'|format(entry[2]) }}</td>
+              <td>{{ entry[3] }}</td>
+              <td>{{ entry[4] if entry[4] else '-' }}</td>
+              <td>{{ entry[5] }}</td>
+            </tr>
+            {% else %}
+            <tr><td colspan="7">No leaderboard entries yet.</td></tr>
+            {% endfor %}
+          </tbody>
+        </table>
+      </div>
+    </section>
+
+    <!-- Ranking explanation -->
+    <section class="card" id="rankingExplanation">
+      <h2 style="font-size:1.1rem;margin-bottom:6px">How Ranking Works</h2>
+      <p>The leaderboard uses a <strong>weighted scoring system</strong> to determine overall rank:</p>
+      <ul style="margin-left: 15px;">
+        <li><strong>Runtime:</strong> How fast the solution runs (lower is better).</li>
+        <li><strong>Memory Usage:</strong> How much memory the solution uses (lower is better).</li>
+      </ul>
+      <p>Overall score is calculated as:</p>
+      <div style="background:#f9f9f9; border-left:4px solid #007acc; padding:1rem; margin:1rem 0;">
+        <code>
+          runtimeScore = yourRuntime / bestRuntime<br>
+          memoryScore  = yourMemory / bestMemory<br>
+          overallScore = runtimeScore × 0.7 + memoryScore × 0.3
+        </code>
+      </div>
+      <p>Lower overall scores are better. If scores are equal, earlier submission ranks higher.</p>
+    </section>
+  </div>
+</div>
+<script src="{{ url_for('serve_js', filename='script.js') }}"></script>
+</body>
+</html>

src/templates/problem.html

@@ -0,0 +1,178 @@
+<!doctype html>
+<html lang="en" class="">
+    <head>
+        <script>
+            /*
+                This fix is for the fucking epileptics. idk what they're called.
+                It fixes the fucking flashing between changing pages.
+                This is both in the index and this file
+                ---
+                This changes nothing if the user uses light-system
+            */
+            (function() {
+                try {
+                    var dark = localStorage.getItem("darkMode");
+                    if (
+                        dark === "true" ||
+                        (dark === null && window.matchMedia("(prefers-color-scheme: dark)").matches)
+                    ) {
+                        document.documentElement.classList.add("dark");
+                    }
+                } catch (e) {}
+            })();
+        </script>
+        <meta charset="UTF-8" />
+        <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+        <title>{{ problem.title }} - Coding Problem</title>
+        <link rel="stylesheet" href="/static/style.css" />
+        <link rel="stylesheet" href="/static/problem.css" />
+        <!-- this is stoopid fucking html link for favicon. just cause of flask-->
+        <link
+            rel="icon"
+            type="image/x-icon"
+            href="{{ url_for('static', filename='favicon.ico') }}"
+        />
+        <link
+            href="https://fonts.cdnfonts.com/css/jetbrains-mono"
+            rel="stylesheet"
+        />
+        <link
+            href="https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600&display=swap"
+            rel="stylesheet"
+        />
+    </head>
+    <body>
+        <div class="main-container">
+            <div class="problem-panel">
+                <div class="problem-header">
+                    <button class="back-btn" onclick="window.location.href='/'">
+                        ← Back
+                    </button>
+                    <h1>{{ problem.title }}</h1>
+                    <button
+                        id="darkModeToggle"
+                        class="dark-mode-toggle"
+                        title="Toggle dark mode"
+                    >
+                        <span class="dark-mode-icon"></span>
+                    </button>
+                </div>
+                <div class="problem-desc">
+                    {{ problem.description | safe | markdown }}
+                </div>
+            </div>
+
+            <div class="editor-container">
+                <div class="editor-header">
+                    <h2 style="margin: 0; font-size: 18px">
+                        Submit Your Solution (Python)
+                    </h2>
+                </div>
+                <div class="editor-wrapper">
+                    <form method="post">
+                        <label for="username">Username (optional):</label>
+                        <input
+                            type="text"
+                            name="username"
+                            id="username"
+                            placeholder="Anonymous"
+                        />
+                        <div id="editor"></div>
+                        <textarea
+                            name="user_code"
+                            id="user_code"
+                            style="display: none"
+                        ></textarea>
+                        <div class="editor-actions">
+                            <button type="submit">Run & Submit</button>
+                        </div>
+                    </form>
+
+                    <div class="result-panel">
+                        <h3>Result</h3>
+                        {% if result %}
+                        <p>
+                            <b>Runtime:</b> {{ '%.4f'|format(result.runtime) }}
+                            seconds
+                        </p>
+                        <p><b>Output:</b></p>
+                        <pre>{{ result.output }}</pre>
+                        {% if result.error %}
+                        <p><b>Error:</b></p>
+                        <pre>{{ result.error }}</pre>
+                        {% endif %} {% else %}
+                        <div class="placeholder">
+                            Your code execution results will appear here
+                        </div>
+                        {% endif %}
+                    </div>
+                </div>
+            </div>
+        </div>
+
+        <script src="https://cdn.jsdelivr.net/npm/monaco-editor@0.45.0/min/vs/loader.js"></script>
+        <script>
+            // Dark mode functionality
+            const darkModeToggle = document.getElementById("darkModeToggle");
+            const html = document.documentElement;
+
+            // Load saved dark mode preference
+            const savedDarkMode = localStorage.getItem("darkMode");
+            if (
+                savedDarkMode === "true" ||
+                (savedDarkMode === null &&
+                    window.matchMedia("(prefers-color-scheme: dark)").matches)
+            ) {
+                html.classList.add("dark");
+            }
+
+            darkModeToggle.addEventListener("click", () => {
+                html.classList.toggle("dark");
+                localStorage.setItem(
+                    "darkMode",
+                    html.classList.contains("dark"),
+                );
+                // Update Monaco editor theme
+                if (window.monacoEditor) {
+                    const isDark = html.classList.contains("dark");
+                    window.monacoEditor.updateOptions({
+                        theme: isDark ? "vs-dark" : "vs-light",
+                    });
+                }
+            });
+
+            require.config({
+                paths: {
+                    vs: "https://cdn.jsdelivr.net/npm/monaco-editor@0.45.0/min/vs",
+                },
+            });
+            require(["vs/editor/editor.main"], function () {
+                const isDark = html.classList.contains("dark");
+                window.monacoEditor = monaco.editor.create(
+                    document.getElementById("editor"),
+                    {
+                        value: "",
+                        language: "python",
+                        theme: isDark ? "vs-dark" : "vs-light",
+                        fontFamily: "JetBrains Mono, monospace",
+                        fontLigatures: true,
+                        automaticLayout: true,
+                        fontSize: 16,
+                        minimap: { enabled: false },
+                    },
+                );
+                document
+                    .querySelector("form")
+                    .addEventListener("submit", function (e) {
+                        var code = window.monacoEditor.getValue();
+                        if (!code.trim()) {
+                            alert("Please enter your code before submitting.");
+                            e.preventDefault();
+                            return false;
+                        }
+                        document.getElementById("user_code").value = code;
+                    });
+            });
+        </script>
+    </body>
+</html>

src/utils.py

@@ -0,0 +1,591 @@
+import sys
+import traceback
+import time
+import io
+import tempfile
+import subprocess
+import os
+import re
+import ast
+import signal
+import resource
+import shlex
+import hashlib
+import platform
+from contextlib import contextmanager
+
+# Security configuration - Expanded whitelist
+ALLOWED_IMPORTS = {
+    'math', 'random', 'datetime', 'json', 'collections', 'itertools',
+    'functools', 'operator', 'copy', 'unittest', 're', 'string', 'pyfiglet',
+    'decimal', 'fractions', 'statistics', 'textwrap', 'unicodedata',
+    'base64', 'binascii', 'struct', 'array', 'heapq', 'bisect'
+}
+
+# Enhanced dangerous patterns with more comprehensive coverage
+DANGEROUS_PATTERNS = [
+    # System/OS operations
+    r'import\s+os(?:\s|$|\.)', r'from\s+os\s+import',
+    r'import\s+subprocess(?:\s|$|\.)', r'from\s+subprocess\s+import',
+    r'import\s+sys(?:\s|$|\.)', r'from\s+sys\s+import',
+    r'import\s+shutil(?:\s|$|\.)', r'from\s+shutil\s+import',
+    r'import\s+pathlib(?:\s|$|\.)', r'from\s+pathlib\s+import',
+    r'import\s+tempfile(?:\s|$|\.)', r'from\s+tempfile\s+import',
+    r'import\s+glob(?:\s|$|\.)', r'from\s+glob\s+import',
+    r'import\s+platform(?:\s|$|\.)', r'from\s+platform\s+import',
+    
+    # Network operations
+    r'import\s+socket(?:\s|$|\.)', r'from\s+socket\s+import',
+    r'import\s+urllib(?:\s|$|\.)', r'from\s+urllib\s+import',
+    r'import\s+requests(?:\s|$|\.)', r'from\s+requests\s+import',
+    r'import\s+http(?:\s|$|\.)', r'from\s+http\s+import',
+    r'import\s+ftplib(?:\s|$|\.)', r'from\s+ftplib\s+import',
+    r'import\s+smtplib(?:\s|$|\.)', r'from\s+smtplib\s+import',
+    
+    # Dynamic execution
+    r'__import__\s*\(', r'exec\s*\(', r'eval\s*\(', r'compile\s*\(',
+    r'globals\s*\(', r'locals\s*\(', r'vars\s*\(', r'dir\s*\(',
+    r'getattr\s*\(', r'setattr\s*\(', r'delattr\s*\(', r'hasattr\s*\(',
+    
+    # File operations
+    r'open\s*\(', r'file\s*\(', r'input\s*\(', r'raw_input\s*\(',
+    
+    # Destructive operations
+    r'\.unlink\s*\(', r'\.remove\s*\(', r'\.rmdir\s*\(', r'\.rmtree\s*\(',
+    r'\.delete\s*\(', r'\.kill\s*\(', r'\.terminate\s*\(',
+    
+    # Threading and multiprocessing
+    r'import\s+threading(?:\s|$|\.)', r'from\s+threading\s+import',
+    r'import\s+multiprocessing(?:\s|$|\.)', r'from\s+multiprocessing\s+import',
+    r'import\s+asyncio(?:\s|$|\.)', r'from\s+asyncio\s+import',
+    
+    # Memory and resource manipulation
+    r'import\s+gc(?:\s|$|\.)', r'from\s+gc\s+import',
+    r'import\s+resource(?:\s|$|\.)', r'from\s+resource\s+import',
+    r'import\s+ctypes(?:\s|$|\.)', r'from\s+ctypes\s+import',
+    
+    # Code introspection
+    r'import\s+inspect(?:\s|$|\.)', r'from\s+inspect\s+import',
+    r'import\s+types(?:\s|$|\.)', r'from\s+types\s+import',
+    
+    # Pickle and serialization security risks
+    r'import\s+pickle(?:\s|$|\.)', r'from\s+pickle\s+import',
+    r'import\s+marshal(?:\s|$|\.)', r'from\s+marshal\s+import',
+    
+    # System exit
+    r'exit\s*\(', r'quit\s*\(', r'sys\.exit\s*\(',
+    
+    # Dunder methods are dangerous if misused, for us we allow classes
+    # specifically the constructor
+    # del i dont allow tho
+    r'__del__\s*\(',
+
+    # Import tricks
+    r'importlib', r'imp\s', r'pkgutil',
+]
+
+# Maximum resource limits
+MAX_MEMORY_MB = 100  # 100MB memory limit
+MAX_CPU_TIME = 5     # 5 seconds CPU time
+MAX_OUTPUT_SIZE = 10000  # 10KB output limit
+MAX_CODE_SIZE = 50000    # 50KB code limit
+MAX_TEST_SIZE = 10000    # 10KB test limit
+
+class SecurityViolationError(Exception):
+    """Raised when a security violation is detected."""
+    pass
+
+class ResourceLimitError(Exception):
+    """Raised when resource limits are exceeded."""
+    pass
+
+@contextmanager
+def resource_limits():
+    """Context manager to set resource limits."""
+    # Set memory limit (in bytes)
+    if hasattr(resource, 'RLIMIT_AS'):
+        try:
+            resource.setrlimit(resource.RLIMIT_AS, (MAX_MEMORY_MB * 1024 * 1024, MAX_MEMORY_MB * 1024 * 1024))
+        except (OSError, ValueError):
+            pass  # Ignore if we can't set memory limits
+    
+    # Set CPU time limit
+    if hasattr(resource, 'RLIMIT_CPU'):
+        try:
+            resource.setrlimit(resource.RLIMIT_CPU, (MAX_CPU_TIME, MAX_CPU_TIME))
+        except (OSError, ValueError):
+            pass  # Ignore if we can't set CPU limits
+    
+    # Set file descriptor limit
+    if hasattr(resource, 'RLIMIT_NOFILE'):
+        try:
+            resource.setrlimit(resource.RLIMIT_NOFILE, (10, 10))
+        except (OSError, ValueError):
+            pass
+    
+    try:
+        yield
+    finally:
+        # Reset limits (though this won't matter much in subprocess)
+        pass
+
+def validate_code_security(code):
+    """
+    Enhanced security validation for code.
+    Returns (is_safe, error_message)
+    """
+    if not isinstance(code, str):
+        return False, "Code must be a string"
+    
+    if len(code.strip()) == 0:
+        return False, "Code cannot be empty"
+    
+    # Check code size limits
+    if len(code) > MAX_CODE_SIZE:
+        return False, f"Code too large (maximum {MAX_CODE_SIZE} bytes allowed)"
+    
+    # Check for null bytes and other binary content
+    if '\x00' in code:
+        return False, "Code contains null bytes"
+    
+    # Check for dangerous patterns with case-insensitive matching
+    for pattern in DANGEROUS_PATTERNS:
+        matches = re.findall(pattern, code, re.IGNORECASE | re.MULTILINE)
+        if matches:
+            return False, f"Dangerous operation detected: {pattern} (matched: {matches[0] if matches else 'unknown'})"
+    
+    # Check for excessive nesting (possible DoS)
+    nesting_level = 0
+    max_nesting = 20
+    for char in code:
+        if char in '([{':
+            nesting_level += 1
+            if nesting_level > max_nesting:
+                return False, f"Excessive nesting detected (max {max_nesting} levels)"
+        elif char in ')]}':
+            nesting_level = max(0, nesting_level - 1)
+    
+    # Parse AST with enhanced validation
+    try:
+        tree = ast.parse(code)
+        
+        # Check for dangerous AST nodes
+        for node in ast.walk(tree):
+            # Import validation
+            if isinstance(node, ast.Import):
+                for alias in node.names:
+                    module_name = alias.name.split('.')[0]
+                    if module_name not in ALLOWED_IMPORTS:
+                        return False, f"Import not allowed: {module_name}"
+                        
+            elif isinstance(node, ast.ImportFrom):
+                if node.module:
+                    module_name = node.module.split('.')[0]
+                    if module_name not in ALLOWED_IMPORTS:
+                        return False, f"Import not allowed: {module_name}"
+            
+            # Check for attribute access on dangerous modules
+            elif isinstance(node, ast.Attribute):
+                if hasattr(node.value, 'id') and node.value.id in ['os', 'sys', 'subprocess']:
+                    return False, f"Dangerous attribute access: {node.value.id}.{node.attr}"
+            
+            # Check for function calls that might be dangerous
+            elif isinstance(node, ast.Call):
+                if isinstance(node.func, ast.Name):
+                    if node.func.id in ['exec', 'eval', 'compile', '__import__', 'open', 'input']:
+                        return False, f"Dangerous function call: {node.func.id}"
+                elif isinstance(node.func, ast.Attribute):
+                    if node.func.attr in ['system', 'popen', 'spawn', 'fork']:
+                        return False, f"Dangerous method call: {node.func.attr}"
+            
+            # Check for while True loops without breaks (potential infinite loops)
+            elif isinstance(node, ast.While):
+                if isinstance(node.test, ast.Constant) and node.test.value is True:
+                    # Check if there's a break statement in the loop
+                    has_break = any(isinstance(n, ast.Break) for n in ast.walk(node))
+                    if not has_break:
+                        return False, "Potentially infinite loop detected (while True without break)"
+                        
+    except SyntaxError as e:
+        return False, f"Syntax error in code: {str(e)}"
+    except RecursionError:
+        return False, "Code too complex (recursion limit exceeded during parsing)"
+    except Exception as e:
+        return False, f"Code validation error: {str(e)}"
+    
+    return True, None
+
+def create_restricted_globals():
+    """Create a heavily restricted global namespace for code execution."""
+    # Very limited set of safe builtins
+    safe_builtins = {
+        'abs', 'all', 'any', 'bin', 'bool', 'chr', 'dict', 'enumerate', 
+        'filter', 'float', 'format', 'frozenset', 'hex', 'int', 'isinstance', 
+        'issubclass', 'iter', 'len', 'list', 'map', 'max', 'min', 'next', 
+        'oct', 'ord', 'pow', 'print', 'range', 'repr', 'reversed', 'round', 
+        'set', 'slice', 'sorted', 'str', 'sum', 'tuple', 'type', 'zip'
+    }
+    
+    # Create restricted builtins dict with error-raising versions of dangerous functions
+    restricted_builtins = {}
+    for name in safe_builtins:
+        if name in __builtins__ if isinstance(__builtins__, dict) else dir(__builtins__):
+            if isinstance(__builtins__, dict):
+                restricted_builtins[name] = __builtins__[name]
+            else:
+                restricted_builtins[name] = getattr(__builtins__, name)
+    
+    # Add error-raising versions of dangerous functions
+    def raise_security_error(name):
+        def _error(*args, **kwargs):
+            raise SecurityViolationError(f"Access to '{name}' is not permitted")
+        return _error
+    
+    dangerous_builtins = ['exec', 'eval', 'compile', '__import__', 'open', 'input', 'globals', 'locals', 'vars']
+    for name in dangerous_builtins:
+        restricted_builtins[name] = raise_security_error(name)
+    
+    restricted_globals = {
+        '__builtins__': restricted_builtins,
+        '__name__': '__restricted__',
+        '__doc__': None,
+    }
+    
+    # Add allowed modules with error handling
+    for module in ALLOWED_IMPORTS:
+        try:
+            imported_module = __import__(module)
+            restricted_globals[module] = imported_module
+        except ImportError:
+            pass  # Module not available, skip
+    
+    return restricted_globals
+
+def create_secure_temp_environment():
+    """Create a secure temporary directory with restricted permissions."""
+    temp_dir = tempfile.mkdtemp(prefix='secure_code_exec_')
+    
+    # Set restrictive permissions on the directory
+    try:
+        os.chmod(temp_dir, 0o700)  # Only owner can read/write/execute
+    except OSError:
+        pass  # Best effort
+        
+    return temp_dir
+
+def cleanup_temp_environment(temp_dir):
+    """Securely clean up temporary directory and all contents."""
+    if not temp_dir or not os.path.exists(temp_dir):
+        return
+    
+    try:
+        # Recursively remove all files and subdirectories
+        for root, dirs, files in os.walk(temp_dir, topdown=False):
+            for name in files:
+                file_path = os.path.join(root, name)
+                try:
+                    os.chmod(file_path, 0o600)  # Ensure we can delete
+                    os.unlink(file_path)
+                except OSError:
+                    pass
+            for name in dirs:
+                dir_path = os.path.join(root, name)
+                try:
+                    os.chmod(dir_path, 0o700)  # Ensure we can delete
+                    os.rmdir(dir_path)
+                except OSError:
+                    pass
+        os.rmdir(temp_dir)
+    except Exception as e:
+        # Log warning but don't fail
+        print(f"Warning: Could not fully clean up temp directory {temp_dir}: {e}", file=sys.stderr)
+
+def run_code_against_tests(user_code, test_code, max_execution_time=5):
+    """
+    Securely run user code against test code with enhanced safety restrictions.
+    
+    Args:
+        user_code: The user's solution code
+        test_code: The test code to validate the solution
+        max_execution_time: Maximum execution time in seconds (default: 5)
+    
+    Returns:
+        dict: Result containing passed, output, runtime, and error information
+    """
+    # Input validation
+    if not isinstance(user_code, str) or not isinstance(test_code, str):
+        return {
+            'passed': False,
+            'output': '',
+            'runtime': 0,
+            'error': "Both user_code and test_code must be strings"
+        }
+    
+    # Validate execution time limit
+    max_execution_time = min(max(1, int(max_execution_time)), MAX_CPU_TIME)
+    
+    # Enhanced security validation
+    user_safe, user_error = validate_code_security(user_code)
+    if not user_safe:
+        return {
+            'passed': False,
+            'output': '',
+            'runtime': 0,
+            'error': f"Security violation in user code: {user_error}"
+        }
+    
+    test_safe, test_error = validate_code_security(test_code)
+    if not test_safe:
+        return {
+            'passed': False,
+            'output': '',
+            'runtime': 0,
+            'error': f"Security violation in test code: {test_error}"
+        }
+    
+    # Additional test code size validation
+    if len(test_code) > MAX_TEST_SIZE:
+        return {
+            'passed': False,
+            'output': '',
+            'runtime': 0,
+            'error': f"Test code too large (maximum {MAX_TEST_SIZE} bytes allowed)"
+        }
+    
+    local_ns = {}
+    output = ''
+    start = time.perf_counter()
+    error = None
+    passed = False
+    temp_dir = None
+    
+    try:
+        # Check if unittest is used in test_code
+        if 'unittest' in test_code:
+            # Create secure temp environment
+            temp_dir = create_secure_temp_environment()
+            temp_file = os.path.join(temp_dir, 'test_code.py')
+            
+            try:
+                combined_code = f"{user_code}\n\n{test_code}"
+                
+                # Write to temp file with restricted permissions
+                with open(temp_file, 'w', encoding='utf-8') as f:
+                    f.write(combined_code)
+                os.chmod(temp_file, 0o600)  # Read/write for owner only
+                
+                # Prepare secure environment variables
+                secure_env = {
+                    'PYTHONPATH': '',
+                    'PYTHONDONTWRITEBYTECODE': '1',
+                    'PYTHONUNBUFFERED': '1',
+                    'PATH': '/usr/bin:/bin',  # Minimal PATH
+                }
+                
+                # Add current Python executable path if needed
+                python_dir = os.path.dirname(sys.executable)
+                if python_dir not in secure_env['PATH']:
+                    secure_env['PATH'] = f"{python_dir}:{secure_env['PATH']}"
+                
+                # Run with subprocess and comprehensive security measures
+                try:
+                    # Create a wrapper script for additional security
+                    wrapper_code = f"""
+import sys
+import signal
+import resource
+
+def timeout_handler(signum, frame):
+    raise TimeoutError("Execution timed out")
+
+# Set up timeout handler
+signal.signal(signal.SIGALRM, timeout_handler)
+signal.alarm({max_execution_time})
+
+try:
+    # Set resource limits
+    {resource_limits.__code__.co_consts}
+    with resource_limits():
+        exec(open(r'{temp_file}').read())
+except Exception as e:
+    print(f"Error: {{e}}", file=sys.stderr)
+    sys.exit(1)
+finally:
+    signal.alarm(0)
+"""
+                    
+                    wrapper_file = os.path.join(temp_dir, 'wrapper.py')
+                    with open(wrapper_file, 'w', encoding='utf-8') as f:
+                        f.write(wrapper_code)
+                    os.chmod(wrapper_file, 0o600)
+                    
+                    # Use the more secure wrapper approach
+                    proc = subprocess.run(
+                        [sys.executable, temp_file],  # Direct execution for now
+                        capture_output=True,
+                        text=True,
+                        timeout=max_execution_time + 1,  # Add buffer for subprocess overhead
+                        encoding='utf-8',
+                        cwd=temp_dir,
+                        env=secure_env,
+                        # Additional security on Unix systems
+                        preexec_fn=os.setpgrp if hasattr(os, 'setpgrp') else None
+                    )
+                    
+                    # Process output
+                    combined_output = ""
+                    if proc.stdout:
+                        combined_output += proc.stdout
+                    if proc.stderr:
+                        if combined_output:
+                            combined_output += "\n" + proc.stderr
+                        else:
+                            combined_output = proc.stderr
+                    
+                    # Limit output size
+                    if len(combined_output) > MAX_OUTPUT_SIZE:
+                        combined_output = combined_output[:MAX_OUTPUT_SIZE] + "\n... (output truncated)"
+                    
+                    output = combined_output
+                    passed = proc.returncode == 0
+                    
+                    if not passed and proc.returncode != 0:
+                        error = f"Tests failed. Return code: {proc.returncode}"
+                        if output.strip():
+                            error += f"\nOutput: {output}"
+                            
+                except subprocess.TimeoutExpired:
+                    passed = False
+                    error = f"Code execution timed out after {max_execution_time} seconds"
+                    output = "Execution timed out"
+                except Exception as e:
+                    passed = False
+                    error = f"Subprocess execution error: {str(e)}"
+                    
+            finally:
+                # Secure cleanup
+                cleanup_temp_environment(temp_dir)
+                
+        else:
+            # Direct execution with heavily restricted globals
+            old_stdout = sys.stdout
+            captured_output = io.StringIO()
+            sys.stdout = captured_output
+            
+            try:
+                # Create restricted execution environment
+                restricted_globals = create_restricted_globals()
+                
+                # Set up timeout for direct execution
+                def timeout_handler(signum, frame):
+                    raise TimeoutError("Execution timed out")
+                
+                if hasattr(signal, 'SIGALRM'):
+                    old_handler = signal.signal(signal.SIGALRM, timeout_handler)
+                    signal.alarm(max_execution_time)
+                
+                try:
+                    # Execute user code in restricted environment
+                    exec(user_code, restricted_globals, local_ns)
+                    
+                    # Execute test code
+                    exec(test_code, {**restricted_globals, **local_ns}, local_ns)
+                    passed = True
+                    
+                finally:
+                    if hasattr(signal, 'SIGALRM'):
+                        signal.alarm(0)  # Cancel alarm
+                        signal.signal(signal.SIGALRM, old_handler)  # Restore handler
+                
+            except TimeoutError:
+                passed = False
+                error = f"Code execution timed out after {max_execution_time} seconds"
+            except SecurityViolationError as e:
+                passed = False
+                error = f"Security violation: {str(e)}"
+            except AssertionError as e:
+                passed = False
+                error = f"Assertion failed: {str(e)}"
+            except MemoryError:
+                passed = False
+                error = "Memory limit exceeded"
+            except RecursionError:
+                passed = False
+                error = "Maximum recursion depth exceeded"
+            except Exception as e:
+                passed = False
+                error = f"Runtime error: {str(e)}"
+                # Don't include full traceback for security
+            finally:
+                output = captured_output.getvalue()
+                sys.stdout = old_stdout
+                
+                # Limit output size
+                if len(output) > MAX_OUTPUT_SIZE:
+                    output = output[:MAX_OUTPUT_SIZE] + "\n... (output truncated)"
+                
+    except Exception as e:
+        passed = False
+        error = f"Execution error: {str(e)}"
+        if temp_dir:
+            cleanup_temp_environment(temp_dir)
+    
+    runtime = time.perf_counter() - start
+    
+    result = {
+        'passed': passed,
+        'output': output.strip() if output else '',
+        'runtime': runtime,
+        'error': error if not passed else None
+    }
+    
+    return result
+
+def safe_code_runner(user_code, test_code):
+    """
+    Enhanced safety wrapper with comprehensive security checks.
+    """
+    # Input validation
+    if not isinstance(user_code, str) or not isinstance(test_code, str):
+        return {
+            'passed': False,
+            'output': '',
+            'runtime': 0,
+            'error': "Both user_code and test_code must be strings"
+        }
+    
+    # Enhanced length checks
+    if len(user_code) > MAX_CODE_SIZE:
+        return {
+            'passed': False,
+            'output': '',
+            'runtime': 0,
+            'error': f"User code too large (maximum {MAX_CODE_SIZE} bytes allowed)"
+        }
+    
+    if len(test_code) > MAX_TEST_SIZE:
+        return {
+            'passed': False,
+            'output': '',
+            'runtime': 0,
+            'error': f"Test code too large (maximum {MAX_TEST_SIZE} bytes allowed)"
+        }
+    
+    # Check for empty code
+    if not user_code.strip():
+        return {
+            'passed': False,
+            'output': '',
+            'runtime': 0,
+            'error': "User code cannot be empty"
+        }
+    
+    if not test_code.strip():
+        return {
+            'passed': False,
+            'output': '',
+            'runtime': 0,
+            'error': "Test code cannot be empty"
+        }
+    
+    return run_code_against_tests(user_code, test_code, MAX_CPU_TIME)

static/index.css

@@ -1,160 +0,0 @@
-:root {
-    --bg: #f6f8fb;
-    --card: #fff;
-    --muted: #6b7280;
-    --accent: #2563eb;
-    --shadow: 0 4px 12px rgba(16, 24, 40, 0.06);
-    --radius: 8px;
-    --mono: 'JetBrains Mono', monospace;
-}
-* { box-sizing: border-box; margin: 0; padding: 0; }
-html, body {
-    height: 100%;
-}
-body {
-    font-family: Inter, sans-serif;
-    background: var(--bg);
-    color: #0f172a;
-    padding: 16px;
-    display: flex;
-    justify-content: center;
-    align-items: center;
-}
-.wrap {
-    width: 100%;
-    max-width: 1100px;
-}
-header {
-    margin-bottom: 14px;
-}
-header h1 {
-    font-size: 1.6rem;
-    color: #111827;
-}
-header p {
-    color: var(--muted);
-    font-size: 0.9rem;
-}
-.content {
-    display: grid;
-    grid-template-columns: 1fr 1fr;
-    gap: 12px;
-}
-.content.single-column {
-    grid-template-columns: 1fr;
-}
-.card {
-    background: var(--card);
-    border-radius: var(--radius);
-    box-shadow: var(--shadow);
-    padding: 12px;
-}
-/* Search/filter controls */
-.search-controls {
-    margin-bottom: 12px;
-    display: flex;
-    gap: 8px;
-}
-.search-input {
-    flex: 1;
-    padding: 6px 10px;
-    border: 1px solid #e5e7eb;
-    border-radius: 4px;
-    font-size: 0.9rem;
-}
-.filter-select {
-    padding: 6px 8px;
-    border: 1px solid #e5e7eb;
-    border-radius: 4px;
-    font-size: 0.9rem;
-    background: white;
-}
-/* Problems list */
-.problems-list .problem-item {
-    padding: 8px;
-    border-bottom: 1px solid #e5e7eb;
-}
-.problem-item:last-child {
-    border-bottom: none;
-}
-.problem-item a {
-    text-decoration: none;
-    color: #0077ff;
-    font-weight: 600;
-}
-/* Leaderboard */
-.leaderboard-head {
-    display: flex;
-    justify-content: space-between;
-    align-items: center;
-    margin-bottom: 6px;
-}
-.leaderboard-controls {
-    display: flex;
-    gap: 8px;
-    margin-bottom: 12px;
-}
-.leaderboard-table {
-    width: 100%;
-    border-collapse: collapse;
-    font-size: 0.9rem;
-}
-.leaderboard-table th,
-.leaderboard-table td {
-    padding: 6px 8px;
-    border-bottom: 1px solid #e5e7eb;
-    text-align: left;
-}
-.leaderboard-table th {
-    background: #f9fafb;
-    font-weight: 600;
-    color: var(--muted);
-}
-.leaderboard-table tr:hover {
-    background: #f3f4f6;
-}
-/* Sort indicators */
-.sortable {
-    cursor: pointer;
-    position: relative;
-    padding-right: 16px;
-}
-.sortable::after {
-    content: "↕";
-    position: absolute;
-    right: 4px;
-    top: 50%;
-    transform: translateY(-50%);
-    font-size: 0.8em;
-    opacity: 0.5;
-}
-.sort-asc::after {
-    content: "↑";
-    opacity: 1;
-}
-.sort-desc::after {
-    content: "↓";
-    opacity: 1;
-}
-/* Toggle button */
-.btn {
-    border: none;
-    background: transparent;
-    cursor: pointer;
-    color: var(--accent);
-    font-size: 0.85rem;
-    padding: 4px 6px;
-    border-radius: 4px;
-}
-.btn:hover {
-    background: rgba(37, 99, 235, 0.08);
-}
-.btn.active {
-    background: rgba(37, 99, 235, 0.15);
-}
-@media (max-width: 800px) {
-    .content { grid-template-columns: 1fr; }
-    .leaderboard-controls {
-    flex-direction: column;
-    }
-}

templates/index.html

@@ -1,102 +0,0 @@
-<!doctype html>
-<html lang="en">
-<head>
-  <meta charset="utf-8" />
-  <meta name="viewport" content="width=device-width,initial-scale=1" />
-  <title>Quick Problem Platform</title>
-  <!--<link rel="favicon" href="/favicon/favicon.ico">-->
-  <script src="script.js" async defer></script>
-  <link rel="stylesheet" href="/static/index.css">
-
-</head>
-<body>
-<div class="wrap">
-  <header>
-    <h1>Quick Problem Platform</h1>
-  </header>
-
-  <div class="content" id="contentContainer">
-    <!-- Problems -->
-    <section class="card problems-list">
-      <div class="search-controls">
-        <input 
-          type="text" 
-          class="search-input" 
-          id="problemSearch" 
-          placeholder="Search problems..." 
-        />
-      </div>
-      <h2 style="margin-bottom:6px;font-size:1.1rem">Problems</h2>
-      <div id="problemsContainer">
-        {% for folder, description, test_code in problems %}
-          <div class="problem-item" data-name="{{ folder.replace('_',' ').title() }}" data-desc="{{ description }}">
-            <a href="/problem/{{ folder }}">{{ folder.replace('_',' ').title() }}</a>
-          </div>
-        {% else %}
-          <div class="problem-item">No problems yet.</div>
-        {% endfor %}
-      </div>
-    </section>
-
-    <!-- Leaderboard -->
-    <section class="card" id="leaderboardSection">
-      <div class="leaderboard-head">
-        <h2 style="font-size:1.1rem;margin:0">Leaderboard</h2>
-        <button class="btn" id="toggleLeaderboard">Hide</button>
-      </div>
-      <div class="leaderboard-controls">
-        <input 
-          type="text" 
-          class="search-input" 
-          id="userSearch" 
-          placeholder="Filter by user..." 
-        />
-        <input 
-          type="text" 
-          class="search-input" 
-          id="problemFilter" 
-          placeholder="Filter by problem..." 
-        />
-        <select class="filter-select" id="runtimeFilter">
-          <option value="">All runtimes</option>
-          <option value="best">Best runtime</option>
-          <option value="worst">Worst runtime</option>
-        </select>
-      </div>
-      <div id="leaderboardContainer">
-        <table class="leaderboard-table">
-          <thead>
-            <tr>
-              <th class="sortable" data-sort="rank">Rank</th>
-              <th class="sortable" data-sort="user">User</th>
-              <th class="sortable" data-sort="problem">Problem</th>
-              <th class="sortable" data-sort="runtime">Runtime (s)</th>
-              <th class="sortable" data-sort="memory">Memory (KB)</th>
-              <th>Line</th>
-              <th class="sortable" data-sort="timestamp">Timestamp</th>
-            </tr>
-          </thead>
-          <tbody id="leaderboardBody">
-            {% for entry in leaderboard %}
-            <tr data-user="{{ entry[0] }}" data-problem="{{ problem_titles.get(entry[1], 'Unknown') }}" 
-                data-runtime="{{ '%.4f'|format(entry[2]) }}" data-memory="{{ entry[3] }}" 
-                data-timestamp="{{ entry[5] }}">
-              <td>{{ loop.index }}</td>
-              <td>{{ entry[0] }}</td>
-              <td>{{ problem_titles.get(entry[1], 'Unknown') }}</td>
-              <td>{{ '%.4f'|format(entry[2]) }}</td>
-              <td>{{ entry[3] }}</td>
-              <td>{{ entry[4] if entry[4] else '-' }}</td>
-              <td>{{ entry[5] }}</td>
-            </tr>
-            {% else %}
-            <tr><td colspan="7">No leaderboard entries yet.</td></tr>
-            {% endfor %}
-          </tbody>
-        </table>
-      </div>
-    </section>
-  </div>
-</div>
-</body>
-</html>

templates/problem.html

@@ -1,66 +0,0 @@
-<!DOCTYPE html>
-<html lang="en">
-<head>
-    <meta charset="UTF-8">
-    <meta name="viewport" content="width=device-width, initial-scale=1.0">
-    <title>{{ problem.title }}</title>
-    <link rel="stylesheet" href="/static/style.css">
-    <link href="https://fonts.cdnfonts.com/css/jetbrains-mono" rel="stylesheet">
-</head>
-<body>
-    <div class="problem-header">
-        <button class="back-btn" onclick="window.location.href='/'">← Back</button>
-        <h1 style="margin-bottom:0;">{{ problem.title }}</h1>
-    </div>
-    <div class="problem-desc">{{ problem.description | safe | markdown }}</div>
-    <div class="editor-section" style="max-width:1160;margin:0">
-        <h2 style="margin-top:0;">Submit Your Solution (Python)</h2>
-        <form method="post">
-            <label for="username">Username (optional):</label>
-            <input type="text" name="username" id="username" placeholder="Anonymous" style="margin-bottom:10px;">
-            <div id="editor"></div>
-            <textarea name="user_code" id="user_code" style="display:none;"></textarea>
-            <div class="editor-actions">
-                <button type="submit">Run & Submit</button>
-            </div>
-        </form>
-    </div>
-    <script src="https://cdn.jsdelivr.net/npm/monaco-editor@0.45.0/min/vs/loader.js"></script>
-    <script>
-      require.config({ paths: { 'vs': 'https://cdn.jsdelivr.net/npm/monaco-editor@0.45.0/min/vs' } });
-      require(['vs/editor/editor.main'], function() {
-        var editor = monaco.editor.create(document.getElementById('editor'), {
-          value: '',
-          language: 'python',
-          theme: 'vs-light',
-          fontFamily: 'JetBrains Mono, monospace',
-          fontLigatures: true,
-          automaticLayout: true,
-          fontSize: 16,
-          minimap: { enabled: false }
-        });
-        document.querySelector('form').addEventListener('submit', function(e) {
-          var code = editor.getValue();
-          if (!code.trim()) {
-            alert('Please enter your code before submitting.');
-            e.preventDefault();
-            return false;
-          }
-          document.getElementById('user_code').value = code;
-        });
-      });
-    </script>
-    {% if result %}
-        <div class="editor-section" style="max-width:1160;margin:0;margin-top: 5px;">
-            <h3>Result:</h3>
-            <b>Runtime:</b> {{ '%.4f'|format(result.runtime) }} seconds<br>
-            <b>Output:</b>
-            <pre>{{ result.output }}</pre>
-            {% if result.error %}
-                <b>Error:</b>
-                <pre>{{ result.error }}</pre>
-            {% endif %}
-        </div>
-    {% endif %}
-</body>
-</html>

templates/script.js

@@ -1,152 +0,0 @@
-// Toggle leaderboard visibility
-const toggleBtn = document.getElementById('toggleLeaderboard');
-const leaderboardSection = document.getElementById('leaderboardSection');
-const contentContainer = document.getElementById('contentContainer');
-
-toggleBtn.addEventListener('click', () => {
-if (leaderboardSection.style.display === 'none') {
-    leaderboardSection.style.display = '';
-    toggleBtn.textContent = 'Hide';
-    contentContainer.classList.remove('single-column');
-} else {
-    leaderboardSection.style.display = 'none';
-    toggleBtn.textContent = 'Show';
-    contentContainer.classList.add('single-column');
-}
-});
-
-// Problem search functionality
-const problemSearch = document.getElementById('problemSearch');
-const problemsContainer = document.getElementById('problemsContainer');
-const problemItems = problemsContainer.querySelectorAll('.problem-item');
-
-problemSearch.addEventListener('input', () => {
-const searchTerm = problemSearch.value.toLowerCase();
-problemItems.forEach(item => {
-    const name = item.dataset.name.toLowerCase();
-    const desc = item.dataset.desc?.toLowerCase() || '';
-    if (name.includes(searchTerm) || desc.includes(searchTerm)) {
-    item.style.display = '';
-    } else {
-    item.style.display = 'none';
-    }
-});
-});
-
-// Leaderboard filtering and sorting
-const userSearch = document.getElementById('userSearch');
-const problemFilter = document.getElementById('problemFilter');
-const runtimeFilter = document.getElementById('runtimeFilter');
-const leaderboardBody = document.getElementById('leaderboardBody');
-const leaderboardRows = Array.from(leaderboardBody.querySelectorAll('tr'));
-const sortableHeaders = document.querySelectorAll('.sortable');
-
-// Current sort state
-let currentSort = {
-column: null,
-direction: 'asc'
-};
-
-// Filter leaderboard
-function filterLeaderboard() {
-const userTerm = userSearch.value.toLowerCase();
-const problemTerm = problemFilter.value.toLowerCase();
-const runtimeType = runtimeFilter.value;
-
-leaderboardRows.forEach(row => {
-    const user = row.dataset.user.toLowerCase();
-    const problem = row.dataset.problem.toLowerCase();
-    const runtime = parseFloat(row.dataset.runtime);
-    const showUser = user.includes(userTerm);
-    const showProblem = problem.includes(problemTerm);
-    
-    let showRuntime = true;
-    if (runtimeType === 'best') {
-    // Find if this is the best runtime for this user+problem combo
-    const userProblemRows = leaderboardRows.filter(r => 
-        r.dataset.user === row.dataset.user && 
-        r.dataset.problem === row.dataset.problem
-    );
-    const bestRuntime = Math.min(...userProblemRows.map(r => parseFloat(r.dataset.runtime)));
-    showRuntime = runtime === bestRuntime;
-    } else if (runtimeType === 'worst') {
-    // Find if this is the worst runtime for this user+problem combo
-    const userProblemRows = leaderboardRows.filter(r => 
-        r.dataset.user === row.dataset.user && 
-        r.dataset.problem === row.dataset.problem
-    );
-    const worstRuntime = Math.max(...userProblemRows.map(r => parseFloat(r.dataset.runtime)));
-    showRuntime = runtime === worstRuntime;
-    }
-
-    if (showUser && showProblem && showRuntime) {
-    row.style.display = '';
-    } else {
-    row.style.display = 'none';
-    }
-});
-}
-
-// Sort leaderboard
-function sortLeaderboard(column, direction) {
-const rows = Array.from(leaderboardBody.querySelectorAll('tr'));
-const index = Array.from(document.querySelectorAll('th')).findIndex(th => th.dataset.sort === column);
-
-rows.sort((a, b) => {
-    let aValue = a.cells[index].textContent;
-    let bValue = b.cells[index].textContent;
-    
-    // Special handling for numeric columns
-    if (column === 'runtime' || column === 'memory' || column === 'rank') {
-    aValue = parseFloat(aValue) || 0;
-    bValue = parseFloat(bValue) || 0;
-    return direction === 'asc' ? aValue - bValue : bValue - aValue;
-    }
-    
-    // Special handling for timestamps
-    if (column === 'timestamp') {
-    aValue = new Date(aValue).getTime();
-    bValue = new Date(bValue).getTime();
-    return direction === 'asc' ? aValue - bValue : bValue - aValue;
-    }
-    
-    // Default string comparison
-    aValue = aValue.toLowerCase();
-    bValue = bValue.toLowerCase();
-    if (aValue < bValue) return direction === 'asc' ? -1 : 1;
-    if (aValue > bValue) return direction === 'asc' ? 1 : -1;
-    return 0;
-});
-
-// Re-append rows in sorted order
-rows.forEach(row => leaderboardBody.appendChild(row));
-}
-
-// Set up event listeners
-userSearch.addEventListener('input', filterLeaderboard);
-problemFilter.addEventListener('input', filterLeaderboard);
-runtimeFilter.addEventListener('change', filterLeaderboard);
-
-// Set up sorting
-sortableHeaders.forEach(header => {
-header.addEventListener('click', () => {
-    const column = header.dataset.sort;
-    
-    // Reset all sort indicators
-    sortableHeaders.forEach(h => {
-    h.classList.remove('sort-asc', 'sort-desc');
-    });
-    
-    // Determine new sort direction
-    if (currentSort.column === column) {
-    currentSort.direction = currentSort.direction === 'asc' ? 'desc' : 'asc';
-    } else {
-    currentSort.column = column;
-    currentSort.direction = 'asc';
-    }
-    
-    // Apply new sort
-    header.classList.add(`sort-${currentSort.direction}`);
-    sortLeaderboard(column, currentSort.direction);
-});
-});

utils.py

@@ -1,99 +0,0 @@
-import sys
-import traceback
-import time
-import io
-import tempfile
-import subprocess
-import os
-
-def run_code_against_tests(user_code, test_code):
-    local_ns = {}
-    output = ''
-    start = time.perf_counter()
-    error = None
-    passed = False
-    temp_file = None
-    
-    try:
-        # Check if unittest is used in test_code
-        if 'unittest' in test_code:
-            # Write user code + test code to a temp file
-            with tempfile.NamedTemporaryFile('w+', suffix='.py', delete=False, encoding='utf-8') as f:
-                combined_code = f"{user_code}\n\n{test_code}"
-                f.write(combined_code)
-                f.flush()
-                temp_file = f.name
-            
-            # Run the file as a subprocess
-            try:
-                proc = subprocess.run(
-                    [sys.executable, temp_file], 
-                    capture_output=True, 
-                    text=True, 
-                    timeout=10,
-                    encoding='utf-8'
-                )
-                output = proc.stdout
-                if proc.stderr:
-                    output += f"\n{proc.stderr}"
-                
-                passed = proc.returncode == 0
-                if not passed:
-                    error = f"Tests failed. Return code: {proc.returncode}\n{output}"
-                else:
-                    # For successful unittest runs, the stderr contains the test results
-                    if proc.stderr and "OK" in proc.stderr:
-                        output = proc.stderr  # Use stderr as the main output for unittest
-                    
-            except subprocess.TimeoutExpired:
-                passed = False
-                error = "Code execution timed out after 10 seconds"
-                output = "Execution timed out"
-                
-        else:
-            # Capture stdout
-            old_stdout = sys.stdout
-            captured_output = io.StringIO()
-            sys.stdout = captured_output
-            
-            try:
-                # Execute user code
-                exec(user_code, {}, local_ns)
-                # Execute test code (should raise AssertionError if fail)
-                exec(test_code, local_ns, local_ns)
-                passed = True
-                
-            except AssertionError as e:
-                passed = False
-                error = f"Assertion failed: {str(e)}"
-                
-            except Exception as e:
-                passed = False
-                error = f"Runtime error: {traceback.format_exc()}"
-                
-            finally:
-                output = captured_output.getvalue()
-                sys.stdout = old_stdout
-                
-    except Exception as e:
-        passed = False
-        error = f"Execution error: {traceback.format_exc()}"
-        
-    finally:
-        # Clean up temporary file
-        if temp_file and os.path.exists(temp_file):
-            try:
-                os.unlink(temp_file)
-            except Exception as e:
-                print(f"Warning: Could not delete temp file {temp_file}: {e}")
-    
-    runtime = time.perf_counter() - start
-    
-    result = {
-        'passed': passed,
-        'output': output.strip() if output else '',
-        'runtime': runtime,
-        'error': error if not passed else None
-    }
-    
-    return result