diff --git a/src/problem_loader.py b/src/problem_loader.py
deleted file mode 100644
index 5c85a43..0000000
--- a/src/problem_loader.py
+++ /dev/null
@@ -1,15 +0,0 @@
-import json
-import os
-import threading
-import time
-from models import db, Problem
-from flask import current_app
-
-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()
diff --git a/src/problems/regex-phone/description.md b/src/problems/regex-phone/description.md
new file mode 100644
index 0000000..c98fad1
--- /dev/null
+++ b/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 π
+
+* Use the **`re`** (regular expression) library.
+* `\d` means βa digitβ in regex.
+* You will need exactly **3 digits**, then a dash, then **3 digits**, another dash, then **4 digits**.
+* Anchors `^` (start of string) and `$` (end of string) can help ensure the whole string matches.
\ No newline at end of file
diff --git a/src/problems/regex-phone/manifest.json b/src/problems/regex-phone/manifest.json
new file mode 100644
index 0000000..607c20f
--- /dev/null
+++ b/src/problems/regex-phone/manifest.json
@@ -0,0 +1,7 @@
+{
+ "title": "Regex Phonenumber",
+ "description": "A regex problem to match phone numbers in various formats.",
+ "description_md": "problems/regex-phone/description.md",
+ "difficulty": "hard",
+ "test_code": "problems/regex-phone/test.py"
+}
\ No newline at end of file
diff --git a/src/problems/regex-phone/test.py b/src/problems/regex-phone/test.py
new file mode 100644
index 0000000..799e1da
--- /dev/null
+++ b/src/problems/regex-phone/test.py
@@ -0,0 +1,33 @@
+import re
+import unittest
+
+## def is_valid_phone_number(phone_number : str):
+ ## return bool(re.search(r"^(\d{3}-){2}\d{4}$", 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 = "β PASS" if actual == expected else "β FAIL"
+ print(f"{status} | Input: '{phone}' -> Got: {actual} | Expected: {expected}")
+ self.assertEqual(actual, expected)
+ except Exception as e:
+ print(f"β ERROR | Input: '{phone}' -> Exception: {e}")
+ raise
+
+if __name__ == "__main__":
+ unittest.main(verbosity=2)
\ No newline at end of file
diff --git a/src/templates/index.html b/src/templates/index.html
index b1e7943..14dec25 100644
--- a/src/templates/index.html
+++ b/src/templates/index.html
@@ -23,6 +23,12 @@
}
#rankInfoBtn.active { color: #2563eb; cursor:pointer; transition: transform 0.3s ease; }
#rankInfoBtn.active { transform: rotate(90deg); }
+
+/* Highlight top rank */
+.rank-1 { background-color: #f0fff0; }
+.rank-1 td:first-child { font-weight: bold; color: #2e7d32; }
+.sort-asc::after { content: " β"; }
+.sort-desc::after { content: " β"; }
@@ -86,7 +92,7 @@
| {{ entry[0] }} |
{{ problem_titles.get(entry[1], 'Unknown') }}
@@ -125,111 +131,6 @@
-
-
+
- |