leetcode-visual/T035-binary-search-insert.html at main · houbb/leetcode-visual · GitHub

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<!DOCTYPE html>
<html lang="zh">
<head>
  <meta charset="UTF-8" />
  <title>🔍 搜索插入位置可视化</title>
  <style>
    body {
      font-family: "Helvetica Neue", sans-serif;
      background-color: #f2f4f8;
      margin: 0;
      padding: 20px;
    }

    h1 {
      text-align: center;
      color: #333;
    }

    .container {
      max-width: 800px;
      margin: auto;
      background: #fff;
      padding: 20px;
      border-radius: 10px;
      box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    }

    label {
      display: block;
      margin: 10px 0 5px;
      font-weight: bold;
    }

    input[type="text"], input[type="number"] {
      width: 100%;
      padding: 10px;
      font-size: 16px;
      margin-bottom: 15px;
      border: 1px solid #ccc;
      border-radius: 5px;
    }

    button {
      padding: 10px 20px;
      font-size: 16px;
      margin-top: 10px;
      border: none;
      background-color: #007bff;
      color: white;
      border-radius: 5px;
      cursor: pointer;
    }

    button:hover {
      background-color: #0056b3;
    }

    .array-box {
      display: flex;
      justify-content: center;
      flex-wrap: wrap;
      margin-top: 20px;
    }

    .array-item {
      width: 40px;
      height: 40px;
      margin: 5px;
      text-align: center;
      line-height: 40px;
      border-radius: 5px;
      background-color: #e0e0e0;
      font-weight: bold;
    }

    .left {
      background-color: #ffcc80 !important;
    }

    .mid {
      background-color: #90caf9 !important;
    }

    .right {
      background-color: #a5d6a7 !important;
    }

    .result {
      margin-top: 20px;
      font-size: 18px;
      font-weight: bold;
      text-align: center;
    }

    .nav {
      text-align: center;
      margin-top: 30px;
    }

    .nav a {
      text-decoration: none;
      color: #007bff;
      font-size: 16px;
    }

    .nav a:hover {
      text-decoration: underline;
    }

    .step {
      font-family: monospace;
      background: #f7f7f7;
      padding: 10px;
      margin-top: 10px;
      border-radius: 5px;
      overflow-x: auto;
    }
  </style>
</head>
<body>
  <div class="container">
    <h1>🔍 搜索插入位置（二分查找可视化）</h1>

    <label for="arrayInput">输入有序数组（用逗号分隔）:</label>
    <input type="text" id="arrayInput" value="1,3,5,6" />

    <label for="targetInput">目标值:</label>
    <input type="number" id="targetInput" value="5" />

    <button onclick="startVisualization()">开始查找</button>

    <div class="array-box" id="arrayDisplay"></div>
    <div class="result" id="resultText"></div>
    <div class="step" id="log"></div>

    <div class="nav">
      <a href="index.html">← 返回首页</a>
    </div>
  </div>

  <script>
    function sleep(ms) {
      return new Promise(resolve => setTimeout(resolve, ms));
    }

    async function startVisualization() {
      const input = document.getElementById("arrayInput").value;
      const target = parseInt(document.getElementById("targetInput").value);
      const arr = input.split(",").map(s => parseInt(s.trim())).filter(n => !isNaN(n));
      const log = document.getElementById("log");
      log.innerText = "";

      if (arr.length === 0 || isNaN(target)) {
        alert("请正确输入数组和目标值！");
        return;
      }

      const arrayDisplay = document.getElementById("arrayDisplay");
      const resultText = document.getElementById("resultText");
      arrayDisplay.innerHTML = "";
      resultText.innerText = "";

      let left = 0, right = arr.length - 1;

      while (left <= right) {
        renderArray(arr, left, right, Math.floor((left + right) / 2));
        const mid = Math.floor((left + right) / 2);
        log.innerText += `left=${left}, mid=${mid}, right=${right}, value=${arr[mid]}\n`;

        await sleep(1000);

        if (arr[mid] === target) {
          resultText.innerText = `🎯 找到目标值，索引为 ${mid}`;
          return;
        } else if (arr[mid] < target) {
          left = mid + 1;
        } else {
          right = mid - 1;
        }
      }

      renderArray(arr, left, -1, -1);
      resultText.innerText = `➕ 未找到目标值，应插入索引为 ${left}`;
    }

    function renderArray(arr, left, right, mid) {
      const display = document.getElementById("arrayDisplay");
      display.innerHTML = "";

      arr.forEach((val, idx) => {
        const div = document.createElement("div");
        div.className = "array-item";
        if (idx === mid) div.classList.add("mid");
        if (idx === left) div.classList.add("left");
        if (idx === right) div.classList.add("right");
        div.innerText = val;
        display.appendChild(div);
      });
    }
  </script>
</body>
</html>