leetcode-visual/T192-sort-merge-sort.html at main · houbb/leetcode-visual · GitHub

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<!DOCTYPE html>
<html lang="zh">
<head>
  <meta charset="UTF-8" />
  <title>T192 归并排序可视化</title>
  <style>
    body {
      font-family: Arial, sans-serif;
      padding: 20px;
    }
    .bar-container {
      position: relative;
      display: flex;
      align-items: flex-end;
      height: 200px;
      margin-bottom: 10px;
      border: 1px solid #ccc;
      padding: 10px;
      gap: 5px;
    }
    .bar {
      width: 30px;
      background-color: steelblue;
      text-align: center;
      color: white;
    }
    .bar.highlight {
      background-color: orange;
    }
    .pointer-row {
      display: flex;
      justify-content: flex-start;
      height: 20px;
      margin-bottom: 20px;
      font-size: 14px;
      line-height: 1;
      padding-left: 10px;
      gap: 5px;
    }
    .pointer-label {
      width: 30px;
      text-align: center;
    }
    .log {
      background: #111;
      color: #0f0;
      padding: 10px;
      height: 200px;
      overflow-y: auto;
      white-space: pre-line;
      font-family: monospace;
    }
    .controls {
      margin-bottom: 10px;
    }
    input {
      padding: 5px;
      width: 300px;
    }
    button {
      padding: 5px 10px;
      margin-left: 5px;
    }
    a {
      display: inline-block;
      margin-top: 20px;
    }
  </style>
</head>
<body>
  <h2>T192 归并排序可视化</h2>

  <div class="controls">
    输入数组（逗号分隔）：
    <input type="text" id="arrayInput" value="5,2,9,1,5,6" />
    动画间隔(ms)：
    <input type="number" id="intervalInput" value="1000" min="100" />
    <button onclick="startVisualization()">可视化</button>
  </div>

  <div class="bar-container" id="barContainer"></div>
  <div class="pointer-row" id="pointerRow"></div>
  <div class="log" id="logBox"></div>

  <a href="index.html">← 返回首页</a>

  <script>
    let delay = 1000;
    const sleep = (ms) => new Promise((res) => setTimeout(res, ms));

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

    function renderBars(arr, highlightRange = [], pointerPositions = {}) {
      const container = document.getElementById("barContainer");
      const pointerRow = document.getElementById("pointerRow");
      container.innerHTML = "";
      pointerRow.innerHTML = "";

      const maxVal = Math.max(...arr);
      arr.forEach((val, idx) => {
        const bar = document.createElement("div");
        bar.className = "bar";
        bar.style.height = `${(val / maxVal) * 100}%`;
        bar.textContent = val;
        if (highlightRange.includes(idx)) {
          bar.classList.add("highlight");
        }
        container.appendChild(bar);

        const label = document.createElement("div");
        label.className = "pointer-label";
        let symbols = "";
        if (pointerPositions.L === idx) symbols += "L";
        if (pointerPositions.M === idx) symbols += "M";
        if (pointerPositions.R === idx) symbols += "R";
        label.textContent = symbols;
        pointerRow.appendChild(label);
      });
    }

    async function mergeSortVisual(arr, left, right) {
      if (left >= right) return;

      const mid = Math.floor((left + right) / 2);
      renderBars(arr, [], { L: left, M: mid, R: right });
      log(`拆分：left=${left}, mid=${mid}, right=${right}`);
      await sleep(delay);

      await mergeSortVisual(arr, left, mid);
      await mergeSortVisual(arr, mid + 1, right);
      await mergeVisual(arr, left, mid, right);
    }

    async function mergeVisual(arr, left, mid, right) {
      const temp = [];
      let i = left, j = mid + 1;

      log(`合并：left=${left}, mid=${mid}, right=${right}`);
      while (i <= mid && j <= right) {
        renderBars(arr, [i, j], { L: left, M: mid, R: right });
        await sleep(delay);
        if (arr[i] <= arr[j]) {
          temp.push(arr[i++]);
        } else {
          temp.push(arr[j++]);
        }
      }

      while (i <= mid) {
        renderBars(arr, [i], { L: left, M: mid, R: right });
        await sleep(delay);
        temp.push(arr[i++]);
      }

      while (j <= right) {
        renderBars(arr, [j], { L: left, M: mid, R: right });
        await sleep(delay);
        temp.push(arr[j++]);
      }

      for (let k = 0; k < temp.length; k++) {
        arr[left + k] = temp[k];
        renderBars(arr, [left + k], { L: left, M: mid, R: right });
        await sleep(delay);
      }

      log(`合并完成：${arr.slice(left, right + 1).join(", ")}`);
    }

    async function startVisualization() {
      let input = document.getElementById("arrayInput").value.trim();
      let arr = input.split(",").map((x) => parseInt(x.trim())).filter(x => !isNaN(x));
      delay = parseInt(document.getElementById("intervalInput").value) || 1000;

      if (!arr.length) {
        alert("请输入有效的整数数组");
        return;
      }

      document.getElementById("logBox").textContent = "";
      renderBars(arr);
      await mergeSortVisual(arr, 0, arr.length - 1);
      log("排序完成！最终结果：" + arr.join(", "));
    }
  </script>
</body>
</html>