leetcode-visual/T160_linkedlist-two-pointer.html at main · houbb/leetcode-visual · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>LC160 双指针链表相交可视化</title>
  <style>
    body {
      font-family: "Segoe UI", sans-serif;
      background: #0f172a;
      color: #e2e8f0;
      padding: 40px;
    }
    h2 {
      text-align: center;
      color: #38bdf8;
    }
    input {
      padding: 10px;
      width: 300px;
      margin-right: 10px;
      border-radius: 5px;
      border: none;
    }
    button {
      padding: 10px 20px;
      background: #3b82f6;
      border: none;
      border-radius: 5px;
      color: white;
      font-weight: bold;
      cursor: pointer;
      margin-top: 10px;
    }
    .list-container {
      display: flex;
      align-items: center;
      margin: 20px 0;
      overflow-x: auto;
    }
    .node {
      padding: 10px 15px;
      margin-right: 10px;
      border-radius: 8px;
      background: #1e293b;
      border: 2px solid #334155;
      position: relative;
      min-width: 40px;
      text-align: center;
      transition: transform 0.3s ease;
    }
    .arrow::after {
      content: '→';
      position: absolute;
      right: -15px;
      top: 50%;
      transform: translateY(-50%);
      color: #94a3b8;
    }
    .highlight {
      background: #facc15 !important;
      color: #000;
      animation: blink 1s infinite;
      border-color: #facc15;
    }
    .shared {
      background: #10b981;
      border-color: #22c55e;
    }
    .overlap {
      background: #c084fc !important;
      border-color: #d946ef !important;
    }
    .both-highlight {
      background: #e11d48 !important;
      border-color: #f43f5e !important;
      animation: flash 1s infinite;
      color: white;
    }
    .log {
      background: #1e293b;
      border: 1px solid #334155;
      border-radius: 8px;
      padding: 10px;
      max-height: 200px;
      overflow-y: auto;
      margin-top: 20px;
      white-space: pre-wrap;
    }
    @keyframes blink {
      0% { box-shadow: 0 0 10px #facc15; }
      50% { box-shadow: 0 0 20px #facc15; }
      100% { box-shadow: 0 0 10px #facc15; }
    }
    @keyframes flash {
      0%, 100% { box-shadow: 0 0 10px #f43f5e; }
      50% { box-shadow: 0 0 20px #f43f5e; }
    }

    .back-btn {
      position: fixed;
      top: 20px;
      left: 20px;
      background: #10b981;
    }
  </style>
</head>
<body>
  <button class="back-btn" onclick="location.href='index.html'">← 返回首页</button>

  <h2>🚀 LC160 双指针链表相交可视化</h2>

  <div style="text-align:center;">
    链表 A: <input id="inputA" placeholder="1,2,3,8,9" value="1,2,3,8,9" />
    链表 B: <input id="inputB" placeholder="4,5,8,9" value="4,5,8,9" />
    <br>
    <button onclick="startVisualization()">开始可视化</button>
  </div>

  <h3>链表 A</h3>
  <div id="listA" class="list-container"></div>

  <h3>链表 B</h3>
  <div id="listB" class="list-container"></div>

  <h3>执行日志</h3>
  <div id="log" class="log"></div>

  <script>
    let nodesA = [], nodesB = [];
    let pointerA = 0, pointerB = 0;
    let timer = null;
    let step = 1;

    function buildLists(valA, valB) {
      let arrA = valA.split(',').map(s => s.trim());
      let arrB = valB.split(',').map(s => s.trim());

      let i = arrA.length - 1, j = arrB.length - 1;
      const shared = [];
      while (i >= 0 && j >= 0 && arrA[i] === arrB[j]) {
        shared.unshift(arrA[i]);
        i--; j--;
      }

      const build = (unique, shared) =>
        unique.map(v => ({ val: v, shared: false }))
              .concat(shared.map(v => ({ val: v, shared: true })));

      return [
        build(arrA.slice(0, i + 1), shared),
        build(arrB.slice(0, j + 1), shared)
      ];
    }

    function renderLists() {
      const listA = document.getElementById("listA");
      const listB = document.getElementById("listB");
      listA.innerHTML = "";
      listB.innerHTML = "";

      nodesA.forEach((node, idx) => {
        const div = document.createElement("div");
        let className = "node arrow";
        if (node.shared) className += " shared";
        if (idx === pointerA && idx < nodesA.length) {
          if (pointerB < nodesB.length && nodesB[pointerB].val === node.val && node.shared) {
            className += " both-highlight"; // 🎯 重合节点高亮
          } else if (node.shared) {
            className += " overlap"; // 🟣 路过共享节点
          } else {
            className += " highlight";
          }
        }
        div.className = className;
        div.textContent = node.val;
        listA.appendChild(div);
      });

      nodesB.forEach((node, idx) => {
        const div = document.createElement("div");
        let className = "node arrow";
        if (node.shared) className += " shared";
        if (idx === pointerB && idx < nodesB.length) {
          if (pointerA < nodesA.length && nodesA[pointerA].val === node.val && node.shared) {
            className += " both-highlight"; // 🎯 重合节点高亮
          } else if (node.shared) {
            className += " overlap"; // 🟣 路过共享节点
          } else {
            className += " highlight";
          }
        }
        div.className = className;
        div.textContent = node.val;
        listB.appendChild(div);
      });
    }

    function log(msg) {
      const logDiv = document.getElementById("log");
      logDiv.textContent += msg + "\n";
      logDiv.scrollTop = logDiv.scrollHeight;
    }

    function nextStep() {
      const nodeA = nodesA[pointerA] || null;
      const nodeB = nodesB[pointerB] || null;

      const valA = nodeA ? nodeA.val : "null";
      const valB = nodeB ? nodeB.val : "null";

      log(`Step ${step++}: p1 → ${valA}, p2 → ${valB}`);

      if (nodeA && nodeB && nodeA.shared && nodeB.shared && nodeA.val === nodeB.val) {
        log(`🎉 找到相交节点：${nodeA.val}`);
        renderLists();
        clearInterval(timer);
        return;
      }

      pointerA++;
      if (pointerA > nodesA.length) pointerA = 0;

      pointerB++;
      if (pointerB > nodesB.length) pointerB = 0;

      renderLists();
    }

    function startVisualization() {
      const valA = document.getElementById("inputA").value || "1,2,3,8,9";
      const valB = document.getElementById("inputB").value || "4,5,8,9";

      [nodesA, nodesB] = buildLists(valA, valB);
      pointerA = 0;
      pointerB = 0;
      step = 1;

      document.getElementById("log").textContent = "";
      renderLists();

      if (timer) clearInterval(timer);
      timer = setInterval(nextStep, 1000);
    }
  </script>
</body>
</html>