app.py

@@ -1,5 +1,5 @@
 from markupsafe import Markup
-from flask import Flask, render_template, request, redirect, url_for
+from flask import Flask, render_template, request, redirect, url_for, send_from_directory
 import markdown as md
 
 from models import db, Problem, Solution
@@ -28,6 +28,14 @@ def setup():
 # 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'

problem_scanner.py

@@ -4,8 +4,12 @@ import json
 import sqlite3
 import threading
 import random
-from pathlib import Path
+import tempfile
+import subprocess
 import sys
+import traceback
+import io
+from pathlib import Path
 
 try:
     from watchdog.observers import Observer
@@ -37,6 +41,10 @@ class ProblemScannerThread(threading.Thread):
 
     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)
@@ -46,73 +54,323 @@ class ProblemScannerThread(threading.Thread):
                     if candidate_path.exists():
                         manifest_path = candidate_path
                         break
+                
                 desc_path = folder / 'description.md'
                 test_path = folder / 'test.py'
-                if manifest_path and test_path.exists():
+                
-                    with open(desc_path, 'r') as f:
+                # 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') as f:
+                        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=2)
+                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):
+                if 'locked' in str(e).lower():
-                    time.sleep(0.2 + random.random() * 0.3)
+                    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

problems/reversedstring/test.py

@@ -1,19 +1,26 @@
 import unittest
 
-#<!-- The Function the User needs to write -->
-def revstring(x):
-    return x[::-1]
-
-#<!-- This Test, test if the function works -->
 class TestSolution(unittest.TestCase):
     def test_simple(self):
-        x = "Hello World"
+        test_cases = [
-        self.assertEqual(revstring(x), "dlroW olleH")  # Test simple string reversal
+            ("Hello World", "dlroW olleH"),
-        self.assertEqual(revstring(""), "")  # Test empty string
+            ("", ""),
-        self.assertEqual(revstring("a"), "a")  # Test single character
+            ("a", "a"),
-        self.assertEqual(revstring("racecar"), "racecar")  # Test palindrome
+            ("racecar", "racecar"),
-        self.assertEqual(revstring("12345"), "54321")  # Test numbers as string
+            ("12345", "54321"),
-        self.assertEqual(revstring("!@# $%"), "%$ #@!")  # Test special chars and spaces
+            ("!@# $%", "%$ #@!")
+        ]
+        
+        print("\n=== Function Output Test Results ===")
+        for input_val, expected in test_cases:
+            try:
+                actual = revstring(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()
+    unittest.main(verbosity=2)

problems/sortlist/test.py

@@ -2,15 +2,16 @@ 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)
+#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)) ## sort
+        self.assertEqual(sortlist(self.x), sorted(self.x)) # pyright: ignore[reportUndefinedVariable]
 
 if __name__ == "__main__":
     unittest.main()

static/index.css

@@ -0,0 +1,160 @@
+: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

@@ -1,89 +1,86 @@
-<!DOCTYPE html>
+<!doctype html>
 <html lang="en">
 <head>
-    <meta charset="UTF-8">
+  <meta charset="utf-8" />
-    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+  <meta name="viewport" content="width=device-width,initial-scale=1" />
   <title>Quick Problem Platform</title>
-    <link rel="stylesheet" href="/static/style.css">
+  <!--<link rel="favicon" href="/favicon/favicon.ico">-->
-    <style>
+  <script src="script.js" async defer></script>
-        .leaderboard-table {
+  <link rel="stylesheet" href="/static/index.css">
-            width: auto;
+
-            min-width: 400px;
-            max-width: 600px;
-            border-collapse: collapse;
-            margin: 2em 0;
-            background: #fff;
-            box-shadow: 0 2px 8px #0001;
-            border-radius: 8px;
-            overflow: hidden;
-        }
-        .leaderboard-table th, .leaderboard-table td {
-            padding: 0.7em 1em;
-            text-align: center;
-        }
-        .leaderboard-table th {
-            background: #f5f5f5;
-            font-weight: 600;
-            color: #333;
-        }
-        .leaderboard-table tr:nth-child(even) {
-            background: #fafbfc;
-        }
-        .leaderboard-table tr:nth-child(odd) {
-            background: #f0f2f5;
-        }
-        .leaderboard-table td {
-            font-family: 'JetBrains Mono', monospace;
-            font-size: 1em;
-        }
-        .leaderboard-table tr:hover {
-            background: #e0e7ff;
-        }
-        .problems-list {
-            max-width: 600px;
-            min-width: 400px;
-            margin: 0;
-            padding: 0;
-        }
-        .problems-list ul {
-            list-style: none;
-            padding: 0;
-            margin: 0;
-        }
-        .problems-list li {
-            padding: 0.5em 0;
-        }
-    </style>
 </head>
 <body>
+<div class="wrap">
+  <header>
     <h1>Quick Problem Platform</h1>
-    <!--<a href="/problem/new">Submit New Problem</a>-->
+  </header>
-    <section class="problems-list">
+
-        <h2>Problems</h2>
+  <div class="content" id="contentContainer">
-        <ul>
+    <!-- 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 %}
-                <li>
+          <div class="problem-item" data-name="{{ folder.replace('_',' ').title() }}" data-desc="{{ description }}">
-                    <a href="/problem/{{ folder }}"><b>{{ folder.replace('_', ' ').title() }}</b></a>
+            <a href="/problem/{{ folder }}">{{ folder.replace('_',' ').title() }}</a>
-                </li>
+          </div>
         {% else %}
-                <li>No problems yet.</li>
+          <div class="problem-item">No problems yet.</div>
         {% endfor %}
-        </ul>
+      </div>
     </section>
-    <section>
+
-        <h2>Leaderboard</h2>
+    <!-- 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>Rank</th>
+              <th class="sortable" data-sort="rank">Rank</th>
-                <th>User</th>
+              <th class="sortable" data-sort="user">User</th>
-                <th>Problem</th>
+              <th class="sortable" data-sort="problem">Problem</th>
-                <th>Runtime (s)</th>
+              <th class="sortable" data-sort="runtime">Runtime (s)</th>
-                <th>Memory (KB)</th>
+              <th class="sortable" data-sort="memory">Memory (KB)</th>
-                <th>Line Number</th>
+              <th>Line</th>
-                <th>Timestamp</th>
+              <th class="sortable" data-sort="timestamp">Timestamp</th>
             </tr>
+          </thead>
+          <tbody id="leaderboardBody">
             {% for entry in leaderboard %}
-            <tr>
+            <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>
@@ -95,7 +92,11 @@
             {% else %}
             <tr><td colspan="7">No leaderboard entries yet.</td></tr>
             {% endfor %}
+          </tbody>
         </table>
+      </div>
     </section>
+  </div>
+</div>
 </body>
 </html>

templates/script.js

@@ -0,0 +1,152 @@
+// 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

@@ -1,51 +1,99 @@
-
 import sys
 import traceback
 import time
 import io
+import tempfile
+import subprocess
+import os
 
 def run_code_against_tests(user_code, test_code):
-    import tempfile
-    import subprocess
     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) as f:
+            with tempfile.NamedTemporaryFile('w+', suffix='.py', delete=False, encoding='utf-8') as f:
-                f.write(user_code + '\n' + test_code)
+                combined_code = f"{user_code}\n\n{test_code}"
+                f.write(combined_code)
                 f.flush()
-                f_name = f.name
+                temp_file = f.name
+            
             # Run the file as a subprocess
-            proc = subprocess.run([sys.executable, f_name], capture_output=True, text=True, timeout=10)
+            try:
-            output = proc.stdout + proc.stderr
+                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
-            error = None if passed else output
+                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
-            sys.stdout = mystdout = io.StringIO()
+            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 = traceback.format_exc()
+                error = f"Runtime error: {traceback.format_exc()}"
+                
             finally:
-        if 'mystdout' in locals():
+                output = captured_output.getvalue()
-            output = mystdout.getvalue() or output
+                sys.stdout = old_stdout
-        sys.stdout = old_stdout if 'old_stdout' in locals() else sys.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,
+        'output': output.strip() if output else '',
         'runtime': runtime,
         'error': error if not passed else None
     }
+    
     return result