leetcode-visual/T153-binary-search-find-minimum-in-rotated-sorted-array.html at main · houbb/leetcode-visual · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8" />
  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  <title>T153 Find Minimum in Rotated Sorted Array</title>
  <style>
    body {
      font-family: sans-serif;
      background-color: #f0f2f5;
      padding: 20px;
    }
    .array-container {
      display: flex;
      justify-content: center;
      margin-top: 20px;
      position: relative;
    }
    .box {
      width: 50px;
      height: 50px;
      border: 2px solid #333;
      display: flex;
      justify-content: center;
      align-items: center;
      margin: 0 4px;
      background-color: white;
      font-weight: bold;
      transition: background-color 0.5s;
      position: relative;
    }
    .highlight-left {
      background-color: #ffd700;
    }
    .highlight-mid {
      background-color: #1e90ff;
      color: white;
    }
    .highlight-right {
      background-color: #32cd32;
      color: white;
    }
    .highlight-result {
      background-color: #ff1493 !important;
      color: white;
    }
    .pointer-labels {
      position: absolute;
      top: -25px;
      left: 0;
      width: 100%;
      display: flex;
      justify-content: center;
    }
    .pointer {
      font-size: 14px;
      color: black;
      position: absolute;
    }
    .log {
      background-color: #111;
      color: #0f0;
      padding: 10px;
      margin-top: 20px;
      height: 200px;
      overflow-y: auto;
      font-family: monospace;
      white-space: pre-wrap;
    }
    input[type="text"] {
      width: 300px;
      padding: 5px;
      font-size: 16px;
    }
    button {
      padding: 6px 16px;
      margin-left: 8px;
      font-size: 16px;
      cursor: pointer;
    }
    .nav {
      margin-top: 20px;
    }
    .nav a {
      color: #007bff;
      text-decoration: none;
    }
    .nav a:hover {
      text-decoration: underline;
    }
  </style>
</head>
<body>
  <h2>T153 可视化：寻找旋转排序数组中的最小值</h2>
  <div>
    输入数组（逗号分隔）：<input type="text" id="inputArray" value="4,5,6,7,0,1,2">
    <button onclick="visualize()">开始可视化</button>
  </div>
  <div class="array-container" id="arrayContainer"></div>
  <div class="log" id="log"></div>
  <div class="nav">
    <a href="index.html">← 返回首页</a>
  </div>

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

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

    function renderArray(nums, left, mid, right, highlightIndex = -1) {
      const container = document.getElementById("arrayContainer");
      container.innerHTML = "";

      nums.forEach((num, i) => {
        const div = document.createElement("div");
        div.className = "box";
        div.textContent = num;

        if (i === highlightIndex) {
          div.classList.add("highlight-result");
        } else {
          if (i === left) div.classList.add("highlight-left");
          if (i === mid) div.classList.add("highlight-mid");
          if (i === right) div.classList.add("highlight-right");
        }

        container.appendChild(div);
      });

      // Add pointer labels
      const pointerLayer = document.createElement("div");
      pointerLayer.className = "pointer-labels";

      nums.forEach((_, i) => {
        const label = document.createElement("div");
        label.style.width = "58px";
        label.style.textAlign = "center";
        if (i === left) label.textContent = "L";
        else if (i === mid) label.textContent = "M";
        else if (i === right) label.textContent = "R";
        else label.textContent = "";
        pointerLayer.appendChild(label);
      });

      container.appendChild(pointerLayer);
    }

    async function visualize() {
      document.getElementById("log").textContent = "";
      let input = document.getElementById("inputArray").value;
      let nums = input.split(",").map(s => parseInt(s.trim())).filter(n => !isNaN(n));
      if (nums.length === 0) {
        log("请输入有效的整数数组");
        return;
      }

      let left = 0;
      let right = nums.length - 1;
      let min = nums[0];
      let resultIndex = 0;

      while (left <= right) {
        const mid = Math.floor(left + (right - left) / 2);
        renderArray(nums, left, mid, right);
        log(`当前范围 [${left}, ${right}]，mid=${mid}, nums[mid]=${nums[mid]}`);
        await sleep(1000);

        if (nums[left] <= nums[right]) {
          min = Math.min(min, nums[left]);
          resultIndex = left;
          log(`数组整体有序，最小值为 nums[${left}] = ${nums[left]}`);
          break;
        }

        if (nums[mid] < min) {
          min = nums[mid];
          resultIndex = mid;
        }
        log(`更新 min = ${min}`);

        if (nums[left] <= nums[mid]) {
          log("左侧有序，最小值在右侧");
          left = mid + 1;
        } else {
          log("右侧有序，最小值在左侧");
          right = mid - 1;
        }

        await sleep(1000);
      }

      renderArray(nums, -1, -1, -1, resultIndex);
      log("\n最终最小值为：" + min);
    }
  </script>
</body>
</html>