semi working darkmode

src/static/index.css

@@ -1,24 +1,47 @@
 :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;
+    --mono: "JetBrains Mono", monospace;
 }
-* { box-sizing: border-box; margin: 0; padding: 0; }
+
-html, body {
+/* 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: #0f172a;
+    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%;
@@ -27,15 +50,49 @@ body {
 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: #111827;
+    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;
@@ -59,32 +116,53 @@ header p {
 .search-input {
     flex: 1;
     padding: 6px 10px;
-    border: 1px solid #e5e7eb;
+    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 #e5e7eb;
+    border: 1px solid var(--border);
     border-radius: 4px;
     font-size: 0.9rem;
-    background: white;
+    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 #e5e7eb;
+    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: #0077ff;
+    color: var(--accent);
     font-weight: 600;
+    transition: color 0.3s ease;
+}
+.problem-item a:hover {
+    text-decoration: underline;
 }
 /* Difficulty badge */
 .difficulty {
@@ -99,14 +177,14 @@ header p {
     white-space: nowrap;
 }
 .difficulty[data-difficulty="easy"] {
-    background-color: #4CAF50; /* Green */
+    background-color: #4caf50; /* Green */
 }
 .difficulty[data-difficulty="medium"] {
-    background-color: #FFC107; /* Amber */
+    background-color: #ffc107; /* Amber */
     color: #333;
 }
 .difficulty[data-difficulty="hard"] {
-    background-color: #F44336; /* Red */
+    background-color: #f44336; /* Red */
 }
 /* Leaderboard */
 .leaderboard-head {
@@ -128,16 +206,16 @@ header p {
 .leaderboard-table th,
 .leaderboard-table td {
     padding: 6px 8px;
-    border-bottom: 1px solid #e5e7eb;
+    border-bottom: 1px solid var(--border);
     text-align: left;
 }
 .leaderboard-table th {
-    background: #f9fafb;
+    background: var(--hover);
     font-weight: 600;
     color: var(--muted);
 }
 .leaderboard-table tr:hover {
-    background: #f3f4f6;
+    background: var(--hover);
 }
 /* Sort indicators */
 .sortable {
@@ -179,7 +257,9 @@ header p {
     background: rgba(37, 99, 235, 0.15);
 }
 @media (max-width: 800px) {
-    .content { grid-template-columns: 1fr; }
+    .content {
+        grid-template-columns: 1fr;
+    }
     .leaderboard-controls {
         flex-direction: column;
     }
@@ -187,7 +267,9 @@ header p {
 
 /* Leaderboard horizontal collapse */
 #leaderboardSection {
-  transition: max-width 0.35s ease, opacity 0.25s ease;
+    transition:
+        max-width 0.35s ease,
+        opacity 0.25s ease;
     overflow: hidden;
     max-width: 100%;
 }
@@ -205,3 +287,40 @@ header p {
 #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

@@ -1,15 +1,46 @@
+: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;
+    font-family: "Inter", sans-serif;
     margin: 0;
     padding: 0;
-    background-color: #f9f9f9;
+    background-color: var(--bg);
-    color: #333;
+    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 {
+*,
+*::before,
+*::after {
     box-sizing: inherit;
 }
 
@@ -23,11 +54,12 @@ body {
 .problem-panel {
     flex: 1 1 400px; /* grow/shrink with base 400px */
     min-width: 300px;
-    background: white;
+    background: var(--card);
     overflow-y: auto;
     padding: 20px;
-    border-right: 1px solid #eaeaea;
+    border-right: 1px solid var(--border);
     max-height: 100vh;
+    transition: background-color 0.3s ease;
 }
 
 .editor-container {
@@ -35,14 +67,15 @@ body {
     min-width: 300px;
     display: flex;
     flex-direction: column;
-    background: white;
+    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 #eaeaea;
+    border-bottom: 1px solid var(--border);
     flex-shrink: 0;
 }
 
@@ -58,28 +91,65 @@ body {
 .problem-header {
     display: flex;
     align-items: center;
+    justify-content: space-between;
     margin-bottom: 20px;
 }
 
 .back-btn {
     background: none;
-    border: none;
+    border: 1px solid var(--border);
+    border-radius: 4px;
     cursor: pointer;
     font-size: 16px;
-    color: #666;
+    color: var(--muted);
     margin-right: 15px;
-    padding: 5px;
+    padding: 6px 10px;
+    transition: all 0.3s ease;
 }
 
 .back-btn:hover {
-    color: #000;
+    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: #1a1a1a;
+    color: var(--text);
+    flex: 1;
 }
 
 .problem-desc {
@@ -89,19 +159,20 @@ h1 {
 }
 
 .problem-desc pre {
-    background: #f6f8fa;
+    background: var(--code-bg);
     padding: 12px;
     border-radius: 4px;
     overflow-x: auto;
-    font-family: 'JetBrains Mono', monospace;
+    font-family: "JetBrains Mono", monospace;
     font-size: 14px;
+    border: 1px solid var(--border);
 }
 
 .problem-desc code {
-    background: #f6f8fa;
+    background: var(--code-bg);
     padding: 2px 4px;
     border-radius: 3px;
-    font-family: 'JetBrains Mono', monospace;
+    font-family: "JetBrains Mono", monospace;
     font-size: 14px;
 }
 
@@ -113,7 +184,7 @@ h1 {
 }
 
 .editor-actions button {
-    background-color: #007bff;
+    background-color: var(--accent);
     color: white;
     border: none;
     padding: 8px 16px;
@@ -121,16 +192,17 @@ h1 {
     cursor: pointer;
     font-weight: 500;
     font-size: 14px;
+    transition: background-color 0.3s ease;
 }
 
 .editor-actions button:hover {
-    background-color: #0069d9;
+    background-color: var(--accent-hover);
 }
 
 #editor {
     flex: 1 1 auto;
     min-height: 300px;
-    border: 1px solid #ddd;
+    border: 1px solid var(--editor-border);
     border-radius: 4px;
     overflow: auto;
     max-height: 60vh;
@@ -139,12 +211,14 @@ h1 {
 .result-panel {
     margin-top: 20px;
     padding: 15px;
-    background: #f8f9fa;
+    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 {
@@ -154,18 +228,19 @@ h1 {
 }
 
 .result-panel pre {
-    background: #f6f8fa;
+    background: var(--code-bg);
     padding: 12px;
     border-radius: 4px;
     overflow-x: auto;
     white-space: pre-wrap;
-    font-family: 'JetBrains Mono', monospace;
+    font-family: "JetBrains Mono", monospace;
     font-size: 14px;
     margin: 5px 0;
+    border: 1px solid var(--border);
 }
 
 .placeholder {
-    color: #999;
+    color: var(--muted);
     font-style: italic;
     text-align: center;
     padding: 20px;
@@ -175,16 +250,24 @@ label {
     display: block;
     margin-bottom: 5px;
     font-size: 14px;
-    color: #666;
+    color: var(--muted);
 }
 
 input[type="text"] {
     width: 100%;
     padding: 8px;
-    border: 1px solid #ddd;
+    border: 1px solid var(--border);
     border-radius: 4px;
     margin-bottom: 15px;
-    font-family: 'Inter', sans-serif;
+    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 */
@@ -194,13 +277,14 @@ input[type="text"] {
         height: auto;
         overflow-y: visible;
     }
-    .problem-panel, .editor-container {
+    .problem-panel,
+    .editor-container {
         flex: none;
         width: 100%;
         min-width: auto;
         max-height: none;
         border-right: none;
-        border-bottom: 1px solid #eaeaea;
+        border-bottom: 1px solid var(--border);
     }
     #editor {
         min-height: 400px;

src/static/script.js

@@ -0,0 +1,402 @@
+document.addEventListener("DOMContentLoaded", () => {
+  // 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"));
+  });
+
+  // Problem search and pagination
+  const problemSearch = document.getElementById("problemSearch");
+  const problemsContainer = document.getElementById("problemsContainer");
+  const problemsPagination = document.getElementById("problemsPagination");
+  const problemsPrevBtn = document.getElementById("problemsPrevBtn");
+  const problemsNextBtn = document.getElementById("problemsNextBtn");
+  const problemsPaginationInfo = document.getElementById(
+    "problemsPaginationInfo",
+  );
+
+  let allProblemItems = [];
+  let filteredProblemItems = [];
+  let currentPage = 1;
+  const itemsPerPage = 10;
+
+  // Initialize problem items
+  function initializeProblemItems() {
+    allProblemItems = Array.from(
+      problemsContainer?.querySelectorAll(".problem-item") || [],
+    );
+    filteredProblemItems = [...allProblemItems];
+    updatePagination();
+  }
+
+  function updatePagination() {
+    const totalPages = Math.ceil(filteredProblemItems.length / itemsPerPage);
+    const startIndex = (currentPage - 1) * itemsPerPage;
+    const endIndex = startIndex + itemsPerPage;
+
+    // Hide all items first
+    allProblemItems.forEach((item) => {
+      item.style.display = "none";
+    });
+
+    // Show current page items
+    filteredProblemItems.slice(startIndex, endIndex).forEach((item) => {
+      item.style.display = "";
+    });
+
+    // Update pagination controls
+    if (problemsPrevBtn) problemsPrevBtn.disabled = currentPage <= 1;
+    if (problemsNextBtn) problemsNextBtn.disabled = currentPage >= totalPages;
+    if (problemsPaginationInfo) {
+      problemsPaginationInfo.textContent =
+        totalPages > 0
+          ? `Page ${currentPage} of ${totalPages}`
+          : "No problems found";
+    }
+
+    // Hide pagination if not needed
+    if (problemsPagination) {
+      problemsPagination.classList.toggle("hidden", totalPages <= 1);
+    }
+  }
+
+  function filterProblems() {
+    const term = problemSearch?.value.toLowerCase().trim() || "";
+    filteredProblemItems = allProblemItems.filter((item) => {
+      const name = item.dataset.name?.toLowerCase() || "";
+      const desc = item.dataset.desc?.toLowerCase() || "";
+      return !term || name.includes(term) || desc.includes(term);
+    });
+    currentPage = 1;
+    updatePagination();
+  }
+
+  // Event listeners for pagination
+  problemsPrevBtn?.addEventListener("click", () => {
+    if (currentPage > 1) {
+      currentPage--;
+      updatePagination();
+    }
+  });
+
+  problemsNextBtn?.addEventListener("click", () => {
+    const totalPages = Math.ceil(filteredProblemItems.length / itemsPerPage);
+    if (currentPage < totalPages) {
+      currentPage++;
+      updatePagination();
+    }
+  });
+
+  problemSearch?.addEventListener("input", filterProblems);
+
+  // Initialize problems pagination
+  if (problemsContainer) {
+    initializeProblemItems();
+  }
+
+  // Leaderboard functionality
+  const problemFilter = document.getElementById("problemFilter");
+  const runtimeFilter = document.getElementById("runtimeFilter");
+  const leaderboardBody = document.getElementById("leaderboardBody");
+  const sortableHeaders = document.querySelectorAll(".sortable");
+
+  let currentSort = { column: "rank", direction: "asc" };
+  let allRows = [];
+
+  // Initialize rows array
+  function initializeRows() {
+    allRows = Array.from(leaderboardBody.querySelectorAll("tr")).map((row) => {
+      return {
+        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: Array.from(leaderboardBody.children).indexOf(row),
+      };
+    });
+  }
+
+  function updateRankClasses() {
+    const visibleRows = allRows.filter(
+      (row) => row.element.style.display !== "none",
+    );
+    visibleRows.forEach((rowData, index) => {
+      const rank = index + 1;
+      const row = rowData.element;
+
+      // Update rank cell
+      const rankCell = row.cells[0];
+      if (rankCell) rankCell.textContent = rank;
+
+      // Update rank classes
+      row.className = row.className.replace(/\brank-\d+\b/g, "");
+      if (rank === 1) row.classList.add("rank-1");
+      else if (rank <= 3) row.classList.add("rank-top3");
+    });
+  }
+
+  function calculateOverallRanking() {
+    const visibleRows = allRows.filter(
+      (row) => row.element.style.display !== "none",
+    );
+
+    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];
+
+      // Prevent division by zero
+      const runtimeScore =
+        problemBest.bestRuntime > 0
+          ? rowData.runtime / problemBest.bestRuntime
+          : 1;
+      const memoryScore =
+        problemBest.bestMemory > 0
+          ? rowData.memory / problemBest.bestMemory
+          : 1;
+
+      // Weighted overall score (70% runtime, 30% memory)
+      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; // Use small epsilon for float comparison
+
+      // If scores are essentially equal, prefer earlier submission
+      return a.timestamp - b.timestamp;
+    });
+
+    // Reorder DOM elements and update ranks
+    visibleRows.forEach((rowData, index) => {
+      leaderboardBody.appendChild(rowData.element);
+    });
+
+    updateRankClasses();
+  }
+
+  function filterLeaderboard() {
+    const problemTerm = (problemFilter?.value || "").toLowerCase().trim();
+    const runtimeType = runtimeFilter?.value || "all";
+
+    // Reset all rows to visible first
+    allRows.forEach((rowData) => {
+      rowData.element.style.display = "";
+    });
+
+    // Apply problem filter
+    if (problemTerm) {
+      allRows.forEach((rowData) => {
+        const problemMatch = rowData.problem
+          .toLowerCase()
+          .includes(problemTerm);
+        if (!problemMatch) {
+          rowData.element.style.display = "none";
+        }
+      });
+    }
+
+    // Apply runtime filter (best/worst per user per problem)
+    if (runtimeType === "best" || runtimeType === "worst") {
+      const userProblemGroups = {};
+
+      // Group by user + problem combination
+      allRows.forEach((rowData) => {
+        if (rowData.element.style.display === "none") return;
+
+        const key = `${rowData.user}::${rowData.problem}`;
+        if (!userProblemGroups[key]) {
+          userProblemGroups[key] = [];
+        }
+        userProblemGroups[key].push(rowData);
+      });
+
+      // Hide all except best/worst for each user-problem combination
+      Object.values(userProblemGroups).forEach((group) => {
+        if (group.length <= 1) return;
+
+        // Sort by runtime
+        group.sort((a, b) => a.runtime - b.runtime);
+
+        const keepIndex = runtimeType === "best" ? 0 : group.length - 1;
+        group.forEach((rowData, index) => {
+          if (index !== keepIndex) {
+            rowData.element.style.display = "none";
+          }
+        });
+      });
+    }
+
+    calculateOverallRanking();
+  }
+
+  function getCellValue(rowData, column) {
+    switch (column) {
+      case "rank":
+        return parseInt(rowData.element.cells[0]?.textContent) || 0;
+      case "user":
+        return rowData.user.toLowerCase();
+      case "problem":
+        return rowData.problem.toLowerCase();
+      case "runtime":
+        return rowData.runtime;
+      case "memory":
+        return rowData.memory;
+      case "timestamp":
+        return rowData.timestamp;
+      case "language":
+        return rowData.language.toLowerCase();
+      default:
+        return "";
+    }
+  }
+
+  function sortLeaderboard(column, direction) {
+    if (column === "rank") {
+      calculateOverallRanking();
+      return;
+    }
+
+    const visibleRows = allRows.filter(
+      (row) => row.element.style.display !== "none",
+    );
+
+    visibleRows.sort((a, b) => {
+      const valueA = getCellValue(a, column);
+      const valueB = getCellValue(b, column);
+
+      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;
+    });
+
+    // Reorder DOM elements
+    visibleRows.forEach((rowData) => {
+      leaderboardBody.appendChild(rowData.element);
+    });
+
+    updateRankClasses();
+  }
+
+  // Event listeners for sorting
+  sortableHeaders.forEach((header) => {
+    header.addEventListener("click", () => {
+      const column = header.dataset.sort;
+      if (!column) return;
+
+      // Remove sorting classes from all headers
+      sortableHeaders.forEach((h) =>
+        h.classList.remove("sort-asc", "sort-desc"),
+      );
+
+      // Toggle sort direction
+      if (currentSort.column === column) {
+        currentSort.direction =
+          currentSort.direction === "asc" ? "desc" : "asc";
+      } else {
+        currentSort.column = column;
+        currentSort.direction = "asc";
+      }
+
+      // Add sorting class to current header
+      header.classList.add(`sort-${currentSort.direction}`);
+
+      sortLeaderboard(column, currentSort.direction);
+    });
+  });
+
+  // Filter event listeners
+  problemFilter?.addEventListener("input", filterLeaderboard);
+  runtimeFilter?.addEventListener("change", filterLeaderboard);
+
+  // Rank info popout
+  const rankInfoBtn = document.getElementById("rankInfoBtn");
+  const rankingExplanation = document.getElementById("rankingExplanation");
+
+  rankInfoBtn?.addEventListener("click", (e) => {
+    e.preventDefault();
+    rankingExplanation?.classList.toggle("active");
+    rankInfoBtn?.classList.toggle("active");
+  });
+
+  // Close ranking explanation when clicking outside
+  document.addEventListener("click", (e) => {
+    if (
+      rankingExplanation?.classList.contains("active") &&
+      !rankingExplanation.contains(e.target) &&
+      !rankInfoBtn?.contains(e.target)
+    ) {
+      rankingExplanation.classList.remove("active");
+      rankInfoBtn?.classList.remove("active");
+    }
+  });
+
+  // Initialize everything
+  if (leaderboardBody && leaderboardBody.children.length > 0) {
+    initializeRows();
+    calculateOverallRanking();
+
+    // Set initial sort indicator
+    const defaultHeader = document.querySelector('[data-sort="rank"]');
+    if (defaultHeader) {
+      defaultHeader.classList.add("sort-asc");
+    }
+  }
+
+  // Apply dark mode to dynamically created elements
+  function applyDarkModeToElements() {
+    const isDark = html.classList.contains("dark");
+    // Any additional dark mode styling for dynamically created elements can go here
+  }
+
+  // Watch for dark mode changes
+  new MutationObserver(applyDarkModeToElements).observe(html, {
+    attributes: true,
+    attributeFilter: ["class"],
+  });
+});

src/static/style.css

@@ -1,3 +1,49 @@
+: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;
@@ -6,39 +52,43 @@
 }
 
 body {
-    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
+    font-family:
+        -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
     line-height: 1.6;
-    color: #333;
+    color: var(--text);
-    background-color: #f8f9fa;
+    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: #2c3e50;
+    color: var(--heading);
     margin-bottom: -10px;
     padding-bottom: 3px;
-    border-bottom: 3px solid #3498db;
+    border-bottom: 3px solid var(--accent);
     font-size: 2.2em;
 }
 
 h2 {
-    color: #34495e;
+    color: var(--heading-secondary);
     margin: 30px 0 20px 0;
     font-size: 1.5em;
 }
 
 h3 {
-    color: #34495e;
+    color: var(--heading-secondary);
     margin: 25px 0 15px 0;
     font-size: 1.3em;
 }
 
 /* Links and buttons */
 a {
-    color: #3498db;
+    color: var(--accent);
     text-decoration: none;
     padding: 8px 16px;
     border-radius: 5px;
@@ -46,13 +96,13 @@ a {
 }
 
 a:hover {
-    background-color: #e3f2fd;
+    background-color: var(--hover-bg);
     text-decoration: none;
 }
 
 /* Primary action link (Submit New Problem) */
 a[href="/problem/new"] {
-    background-color: #3498db;
+    background-color: var(--accent);
     color: white;
     font-weight: 600;
     margin-bottom: 30px;
@@ -62,22 +112,23 @@ a[href="/problem/new"] {
 }
 
 a[href="/problem/new"]:hover {
-    background-color: #2980b9;
+    background-color: var(--accent-hover);
 }
 
 /* Problem list */
 ul {
     list-style: none;
-    background: white;
+    background: var(--card);
     border-radius: 8px;
-    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
+    box-shadow: var(--shadow);
     padding: 25px;
     margin: 20px 0;
+    transition: background-color 0.3s ease;
 }
 
 li {
     padding: 15px 0;
-    border-bottom: 1px solid #eee;
+    border-bottom: 1px solid var(--border);
 }
 
 li:last-child {
@@ -93,7 +144,7 @@ li a {
 }
 
 li a:hover {
-    background-color: #f8f9fa;
+    background-color: var(--hover-bg);
     transform: translateX(5px);
     transition: all 0.2s ease;
 }
@@ -107,7 +158,7 @@ li a:hover {
 }
 
 .back-btn {
-    background-color: #95a5a6;
+    background-color: var(--muted);
     color: white;
     border: none;
     padding: 10px 20px;
@@ -119,30 +170,32 @@ li a:hover {
 }
 
 .back-btn:hover {
-    background-color: #7f8c8d;
+    background-color: var(--muted-hover);
 }
 
 .problem-desc {
-    background: white;
+    background: var(--card);
     padding: 30px;
     border-radius: 8px;
-    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
+    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: white;
+    background: var(--card);
     padding: 30px;
     border-radius: 8px;
-    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
+    box-shadow: var(--shadow);
     margin-bottom: 30px;
+    transition: background-color 0.3s ease;
 }
 
 #editor {
-    border: 2px solid #ddd;
+    border: 2px solid var(--border);
     border-radius: 8px;
     margin: 20px 0;
     height: 400px;
@@ -155,7 +208,7 @@ li a:hover {
 }
 
 form button[type="submit"] {
-    background-color: #27ae60;
+    background-color: var(--success);
     color: white;
     border: none;
     padding: 12px 30px;
@@ -167,50 +220,52 @@ form button[type="submit"] {
 }
 
 form button[type="submit"]:hover {
-    background-color: #229954;
+    background-color: var(--success-hover);
 }
 
 /* Results section */
 b {
-    color: #2c3e50;
+    color: var(--heading);
     display: inline-block;
     margin: 10px 0 5px 0;
 }
 
 pre {
-    background-color: #f4f4f4;
+    background-color: var(--code-bg);
     padding: 20px;
     border-radius: 6px;
-    border-left: 4px solid #3498db;
+    border-left: 4px solid var(--accent);
     margin: 10px 0 20px 0;
     overflow-x: auto;
-    font-family: 'JetBrains Mono', 'Courier New', monospace;
+    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: #e74c3c;
+    border-left-color: var(--error);
-    background-color: #fdf2f2;
+    background-color: var(--error-bg);
 }
 
 /* Status messages */
 p[style*="color:green"] {
-    background-color: #d4edda;
+    background-color: var(--success-bg);
-    color: #155724;
+    color: var(--success-text);
     padding: 15px 20px;
     border-radius: 6px;
-    border-left: 4px solid #27ae60;
+    border-left: 4px solid var(--success);
     margin: 20px 0;
     font-weight: 600;
 }
 
 p[style*="color:red"] {
-    background-color: #f8d7da;
+    background-color: var(--error-bg);
-    color: #721c24;
+    color: var(--error-text);
     padding: 15px 20px;
     border-radius: 6px;
-    border-left: 4px solid #e74c3c;
+    border-left: 4px solid var(--error);
     margin: 20px 0;
     font-weight: 600;
 }
@@ -219,7 +274,7 @@ p[style*="color:red"] {
 a[href="/"] {
     display: inline-block;
     margin-top: 30px;
-    background-color: #6c757d;
+    background-color: var(--muted);
     color: white;
     padding: 10px 20px;
     border-radius: 6px;
@@ -227,7 +282,7 @@ a[href="/"] {
 }
 
 a[href="/"]:hover {
-    background-color: #5a6268;
+    background-color: var(--muted-hover);
 }
 
 /* Responsive design */
@@ -246,7 +301,9 @@ a[href="/"]:hover {
         font-size: 1.8em;
     }
 
-    .problem-desc, .editor-section, ul {
+    .problem-desc,
+    .editor-section,
+    ul {
         padding: 20px;
     }
 

src/templates/index.html

@@ -1,11 +1,12 @@
 <!doctype html>
-<html lang="en">
+<html lang="en" class="">
 <head>
 <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 {
@@ -34,7 +35,12 @@
 <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 -->
@@ -45,7 +51,7 @@
       <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 }}">
+          <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>
@@ -53,6 +59,11 @@
           <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 -->
@@ -131,6 +142,6 @@
     </section>
   </div>
 </div>
-<script src="./script.js"></script>
+<script src="{{ url_for('static', filename='script.js') }}"></script>
 </body>
 </html>

src/templates/problem.html

@@ -1,36 +1,68 @@
-<!DOCTYPE html>
+<!doctype html>
-<html lang="en">
+<html lang="en" class="">
-<head>
+    <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=1.0" />
         <title>{{ problem.title }} - Coding Problem</title>
-    <link rel="stylesheet" href="/static/style.css">
+        <link rel="stylesheet" href="/static/style.css" />
-    <link rel="stylesheet" href="/static/problem.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
-    <link href="https://fonts.cdnfonts.com/css/jetbrains-mono" rel="stylesheet">
+            rel="icon"
-    <link href="https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600&display=swap" rel="stylesheet">
+            type="image/x-icon"
-</head>
+            href="{{ url_for('static', filename='favicon.ico') }}"
-<body>
+        />
+        <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>
+                    <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 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>
+                    <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">
+                        <input
+                            type="text"
+                            name="username"
+                            id="username"
+                            placeholder="Anonymous"
+                        />
                         <div id="editor"></div>
-                    <textarea name="user_code" id="user_code" style="display:none;"></textarea>
+                        <textarea
+                            name="user_code"
+                            id="user_code"
+                            style="display: none"
+                        ></textarea>
                         <div class="editor-actions">
                             <button type="submit">Run & Submit</button>
                         </div>
@@ -39,14 +71,16 @@
                     <div class="result-panel">
                         <h3>Result</h3>
                         {% if result %}
-                        <p><b>Runtime:</b> {{ '%.4f'|format(result.runtime) }} seconds</p>
+                        <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 %}
+                        {% endif %} {% else %}
-                    {% else %}
                         <div class="placeholder">
                             Your code execution results will appear here
                         </div>
@@ -58,28 +92,67 @@
 
         <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' } });
+            // Dark mode functionality
-      require(['vs/editor/editor.main'], function() {
+            const darkModeToggle = document.getElementById("darkModeToggle");
-        var editor = monaco.editor.create(document.getElementById('editor'), {
+            const html = document.documentElement;
-          value: '',
+
-          language: 'python',
+            // Load saved dark mode preference
-          theme: 'vs-light',
+            const savedDarkMode = localStorage.getItem("darkMode");
-          fontFamily: 'JetBrains Mono, monospace',
+            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 }
+                        minimap: { enabled: false },
-        });
+                    },
-        document.querySelector('form').addEventListener('submit', function(e) {
+                );
-          var code = editor.getValue();
+                document
+                    .querySelector("form")
+                    .addEventListener("submit", function (e) {
+                        var code = window.monacoEditor.getValue();
                         if (!code.trim()) {
-            alert('Please enter your code before submitting.');
+                            alert("Please enter your code before submitting.");
                             e.preventDefault();
                             return false;
                         }
-          document.getElementById('user_code').value = code;
+                        document.getElementById("user_code").value = code;
                     });
             });
         </script>
-</body>
+    </body>
 </html>

src/templates/script.js

@@ -1,274 +0,0 @@
-document.addEventListener('DOMContentLoaded', () => {
-  // Problem search
-  const problemSearch = document.getElementById('problemSearch');
-  const problemsContainer = document.getElementById('problemsContainer');
-  const problemItems = problemsContainer?.querySelectorAll('.problem-item') || [];
-  
-  problemSearch?.addEventListener('input', () => {
-    const term = problemSearch.value.toLowerCase().trim();
-    problemItems.forEach(item => {
-      const name = item.dataset.name?.toLowerCase() || '';
-      const desc = item.dataset.desc?.toLowerCase() || '';
-      const shouldShow = !term || name.includes(term) || desc.includes(term);
-      item.style.display = shouldShow ? '' : 'none';
-    });
-  });
-
-  // Leaderboard functionality
-  const problemFilter = document.getElementById('problemFilter');
-  const runtimeFilter = document.getElementById('runtimeFilter');
-  const leaderboardBody = document.getElementById('leaderboardBody');
-  const sortableHeaders = document.querySelectorAll('.sortable');
-  
-  let currentSort = { column: 'rank', direction: 'asc' };
-  let allRows = [];
-
-  // Initialize rows array
-  function initializeRows() {
-    allRows = Array.from(leaderboardBody.querySelectorAll('tr')).map(row => {
-      return {
-        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: Array.from(leaderboardBody.children).indexOf(row)
-      };
-    });
-  }
-
-  function updateRankClasses() {
-    const visibleRows = allRows.filter(row => row.element.style.display !== 'none');
-    visibleRows.forEach((rowData, index) => {
-      const rank = index + 1;
-      const row = rowData.element;
-      
-      // Update rank cell
-      const rankCell = row.cells[0];
-      if (rankCell) rankCell.textContent = rank;
-      
-      // Update rank classes
-      row.className = row.className.replace(/\brank-\d+\b/g, '');
-      if (rank === 1) row.classList.add('rank-1');
-      else if (rank <= 3) row.classList.add('rank-top3');
-    });
-  }
-
-  function calculateOverallRanking() {
-    const visibleRows = allRows.filter(row => row.element.style.display !== 'none');
-    
-    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];
-      
-      // Prevent division by zero
-      const runtimeScore = problemBest.bestRuntime > 0 ? 
-        rowData.runtime / problemBest.bestRuntime : 1;
-      const memoryScore = problemBest.bestMemory > 0 ? 
-        rowData.memory / problemBest.bestMemory : 1;
-      
-      // Weighted overall score (70% runtime, 30% memory)
-      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; // Use small epsilon for float comparison
-      
-      // If scores are essentially equal, prefer earlier submission
-      return a.timestamp - b.timestamp;
-    });
-
-    // Reorder DOM elements and update ranks
-    visibleRows.forEach((rowData, index) => {
-      leaderboardBody.appendChild(rowData.element);
-    });
-    
-    updateRankClasses();
-  }
-
-  function filterLeaderboard() {
-    const problemTerm = (problemFilter?.value || '').toLowerCase().trim();
-    const runtimeType = runtimeFilter?.value || 'all';
-    
-    // Reset all rows to visible first
-    allRows.forEach(rowData => {
-      rowData.element.style.display = '';
-    });
-    
-    // Apply problem filter
-    if (problemTerm) {
-      allRows.forEach(rowData => {
-        const problemMatch = rowData.problem.toLowerCase().includes(problemTerm);
-        if (!problemMatch) {
-          rowData.element.style.display = 'none';
-        }
-      });
-    }
-    
-    // Apply runtime filter (best/worst per user per problem)
-    if (runtimeType === 'best' || runtimeType === 'worst') {
-      const userProblemGroups = {};
-      
-      // Group by user + problem combination
-      allRows.forEach(rowData => {
-        if (rowData.element.style.display === 'none') return;
-        
-        const key = `${rowData.user}::${rowData.problem}`;
-        if (!userProblemGroups[key]) {
-          userProblemGroups[key] = [];
-        }
-        userProblemGroups[key].push(rowData);
-      });
-      
-      // Hide all except best/worst for each user-problem combination
-      Object.values(userProblemGroups).forEach(group => {
-        if (group.length <= 1) return;
-        
-        // Sort by runtime
-        group.sort((a, b) => a.runtime - b.runtime);
-        
-        const keepIndex = runtimeType === 'best' ? 0 : group.length - 1;
-        group.forEach((rowData, index) => {
-          if (index !== keepIndex) {
-            rowData.element.style.display = 'none';
-          }
-        });
-      });
-    }
-    
-    calculateOverallRanking();
-  }
-
-  function getCellValue(rowData, column) {
-    switch (column) {
-      case 'rank':
-        return parseInt(rowData.element.cells[0]?.textContent) || 0;
-      case 'user':
-        return rowData.user.toLowerCase();
-      case 'problem':
-        return rowData.problem.toLowerCase();
-      case 'runtime':
-        return rowData.runtime;
-      case 'memory':
-        return rowData.memory;
-      case 'timestamp':
-        return rowData.timestamp;
-      case 'language':
-        return rowData.language.toLowerCase();
-      default:
-        return '';
-    }
-  }
-
-  function sortLeaderboard(column, direction) {
-    if (column === 'rank') {
-      calculateOverallRanking();
-      return;
-    }
-    
-    const visibleRows = allRows.filter(row => row.element.style.display !== 'none');
-    
-    visibleRows.sort((a, b) => {
-      const valueA = getCellValue(a, column);
-      const valueB = getCellValue(b, column);
-      
-      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;
-    });
-
-    // Reorder DOM elements
-    visibleRows.forEach(rowData => {
-      leaderboardBody.appendChild(rowData.element);
-    });
-    
-    updateRankClasses();
-  }
-
-  // Event listeners for sorting
-  sortableHeaders.forEach(header => {
-    header.addEventListener('click', () => {
-      const column = header.dataset.sort;
-      if (!column) return;
-      
-      // Remove sorting classes from all headers
-      sortableHeaders.forEach(h => h.classList.remove('sort-asc', 'sort-desc'));
-      
-      // Toggle sort direction
-      if (currentSort.column === column) {
-        currentSort.direction = currentSort.direction === 'asc' ? 'desc' : 'asc';
-      } else {
-        currentSort.column = column;
-        currentSort.direction = 'asc';
-      }
-      
-      // Add sorting class to current header
-      header.classList.add(`sort-${currentSort.direction}`);
-      
-      sortLeaderboard(column, currentSort.direction);
-    });
-  });
-
-  // Filter event listeners
-  problemFilter?.addEventListener('input', filterLeaderboard);
-  runtimeFilter?.addEventListener('change', filterLeaderboard);
-
-  // Rank info popout
-  const rankInfoBtn = document.getElementById('rankInfoBtn');
-  const rankingExplanation = document.getElementById('rankingExplanation');
-  
-  rankInfoBtn?.addEventListener('click', (e) => {
-    e.preventDefault();
-    rankingExplanation?.classList.toggle('active');
-    rankInfoBtn?.classList.toggle('active');
-  });
-
-  // Close ranking explanation when clicking outside
-  document.addEventListener('click', (e) => {
-    if (rankingExplanation?.classList.contains('active') && 
-        !rankingExplanation.contains(e.target) && 
-        !rankInfoBtn?.contains(e.target)) {
-      rankingExplanation.classList.remove('active');
-      rankInfoBtn?.classList.remove('active');
-    }
-  });
-
-  // Initialize everything
-  if (leaderboardBody && leaderboardBody.children.length > 0) {
-    initializeRows();
-    calculateOverallRanking();
-    
-    // Set initial sort indicator
-    const defaultHeader = document.querySelector('[data-sort="rank"]');
-    if (defaultHeader) {
-      defaultHeader.classList.add('sort-asc');
-    }
-  }
-});