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+<!DOCTYPE html>
+<html lang="zh-Hans">
+<head>
+<meta charset="UTF-8">
+<meta name="viewport" content="width=device-width, initial-scale=1.0">
+<title>035. 将数组分成两个数组并最小化数组和的差 – 图解</title>
+<style>
+  :root {
+    --blue: #3b82f6; --green: #16a34a; --purple: #8b5cf6;
+    --bg: #f1f5f9; --card: #ffffff; --border: #e2e8f0;
+  }
+  * { box-sizing: border-box; }
+  body {
+    margin: 0; font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
+    background: var(--bg); color: #0f172a;
+  }
+  .container { max-width: 1440px; margin: 0 auto; padding: 20px; }
+  h1 { font-size: 25px; margin: 0 0 12px; }
+  h3 { margin: 0 0 10px; font-size: 16px; }
+
+  .controls {
+    background: var(--card); border: 1px solid var(--border); border-radius: 14px;
+    padding: 12px 16px; display: flex; flex-wrap: wrap; gap: 8px; align-items: center;
+    margin-bottom: 12px;
+  }
+  .controls input {
+    width: 240px; padding: 8px 10px; border: 1px solid #cbd5e1; border-radius: 8px;
+    font-family: monospace; font-size: 14px;
+  }
+  .controls button, .controls select {
+    padding: 8px 12px; border: 1px solid #cbd5e1; border-radius: 8px;
+    background: #f8fafc; font-size: 14px; cursor: pointer;
+  }
+  .controls button:hover { background: #e2e8f0; }
+  .controls button:disabled { opacity: .45; cursor: not-allowed; }
+
+  .pipeline {
+    display: flex; flex-wrap: wrap; align-items: center; gap: 6px;
+    background: #eef2ff; border-radius: 14px; padding: 10px 16px; margin-bottom: 12px;
+    font-size: 14px;
+  }
+  .pipe-step {
+    background: white; border: 1px solid #c7d2fe; border-radius: 999px;
+    padding: 4px 10px; color: #3730a3;
+  }
+  .pipe-step.active { background: #4f46e5; color: white; border-color: #4f46e5; font-weight: 600; }
+  .pipeline i { color: #94a3b8; font-style: normal; }
+
+  .hint {
+    background: #fff7ed; border-left: 4px solid #f59e0b; border-radius: 8px;
+    padding: 10px 16px; margin-bottom: 12px; line-height: 1.7;
+  }
+
+  .panels { display: flex; flex-direction: column; gap: 16px; }
+  .panel {
+    background: var(--card); border: 1px solid var(--border); border-radius: 16px; padding: 20px;
+  }
+  .panel-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
+  @media (max-width: 900px) { .panel-grid { grid-template-columns: 1fr; } }
+
+  .formula-box {
+    background: #f0f9ff; border-radius: 12px; padding: 12px 16px;
+    font-size: 15px; line-height: 1.8; margin-bottom: 12px; color: #0c4a6e;
+  }
+  .nums-line { display: flex; flex-wrap: wrap; align-items: center; gap: 6px; }
+  .chip {
+    display: inline-block; min-width: 40px; text-align: center; padding: 6px 10px;
+    border-radius: 10px; font-family: monospace; font-weight: 600;
+  }
+  .chip.left { background: #dbeafe; color: #1e40af; }
+  .chip.right { background: #ffedd5; color: #9a3412; }
+  .split { font-size: 22px; font-weight: 800; margin: 0 8px; color: #64748b; }
+  .nums-meta { margin-top: 10px; font-size: 14px; color: #475569; }
+
+  .table-wrap { overflow-x: auto; margin-top: 8px; }
+  table { border-collapse: collapse; width: 100%; font-size: 13px; }
+  th, td { border: 1px solid #e2e8f0; padding: 5px 8px; text-align: center; }
+  th { background: #f8fafc; color: #475569; }
+  .sign-plus { color: #16a34a; font-weight: 800; }
+  .sign-minus { color: #dc2626; font-weight: 800; }
+  .calc { font-family: monospace; font-size: 12px; color: #334155; }
+
+  .group-header { background: #eef2ff; font-weight: 600; }
+  .group-active { background: #c7d2fe; }
+  .nearest-row { background: #bbf7d0; }
+  .current-highlight { background: #bae6fd !important; }
+  .processed { opacity: .85; }
+  .dim { opacity: .3; }
+  .best-diff { font-weight: 800; color: var(--green); }
+  .nearest-val { color: var(--green); font-weight: 700; }
+
+  .chart-wrap {
+    background: #f8fafc; border: 1px solid var(--border); border-radius: 12px;
+    padding: 16px 16px 20px; margin-top: 14px;
+  }
+  .chart-scale {
+    position: relative; height: 80px; border-bottom: 2px solid #94a3b8;
+    margin: 0 8px 26px;
+  }
+  .dot {
+    position: absolute; transform: translateX(-50%); width: 14px; height: 14px;
+    border-radius: 50%; background: var(--blue); border: 2px solid white;
+    box-shadow: 0 0 0 2px var(--blue);
+  }
+  .dot.nearest { background: var(--green); box-shadow: 0 0 0 2px var(--green); }
+  .dot-label {
+    position: absolute; bottom: 18px; left: 50%; transform: translateX(-50%);
+    background: rgba(255,255,255,.95); padding: 2px 5px; border-radius: 6px;
+    font-size: 12px; font-family: monospace; white-space: nowrap; border: 1px solid var(--border);
+  }
+  .target-line {
+    position: absolute; top: 0; bottom: 0; width: 2px; background: var(--purple);
+    transform: translateX(-50%);
+  }
+  .target-tick {
+    position: absolute; bottom: -22px; transform: translateX(-50%);
+    font-size: 12px; color: var(--purple); font-weight: 700; white-space: nowrap;
+  }
+  .scale-min-label { position: absolute; left: 0; bottom: -26px; font-size: 11px; color: #94a3b8; }
+  .scale-max-label { position: absolute; right: 0; bottom: -26px; font-size: 11px; color: #94a3b8; }
+
+  .calc-block {
+    background: #f8fafc; border-radius: 12px; padding: 12px 16px;
+    font-size: 15px; line-height: 1.9; margin-bottom: 10px;
+  }
+  .current-answer {
+    margin-top: 12px; padding: 10px 16px; background: #ecfdf5; border-radius: 10px;
+    font-size: 16px;
+  }
+  .final-answer {
+    margin-top: 16px; padding: 16px 20px; background: #ecfdf5;
+    border: 2px solid #86efac; border-radius: 14px; line-height: 1.9;
+  }
+  .final-answer b { color: var(--green); }
+
+  #debug {
+    display: none; background: #fee2e2; color: #b91c1c; padding: 12px; border-radius: 10px;
+    margin-bottom: 14px; white-space: pre-wrap;
+  }
+</style>
+</head>
+<body>
+<div class="container">
+  <h1>🧮 035. 将数组分成两个数组并最小化数组和的差</h1>
+  <div id="debug"></div>
+
+  <div class="controls">
+    <label for="numsInput">nums =</label>
+    <input id="numsInput" value="3, 9, 7, 3" title="偶数个整数，建议长度 ≤ 12">
+    <button id="applyBtn">生成图解</button>
+    <select id="exampleSelect">
+      <option value="[3,9,7,3]">示例 1：[3,9,7,3]</option>
+      <option value="[-36,36]">示例 2：[-36,36]</option>
+      <option value="[2,-1,0,4,-2,-9]">示例 3：[2,-1,0,4,-2,-9]</option>
+    </select>
+    <span style="flex:1"></span>
+    <button id="prevBtn">◀ 上一步</button>
+    <button id="nextBtn">下一步 ▶</button>
+    <button id="jumpBtn">⏭ 跳到结果</button>
+    <button id="autoBtn">自动播放</button>
+    <button id="resetBtn">重置</button>
+  </div>
+
+  <div class="pipeline">
+    <span class="pipe-step" data-stage="formula">① 符号转化</span><i>→</i>
+    <span class="pipe-step" data-stage="left">② 左半枚举</span><i>→</i>
+    <span class="pipe-step" data-stage="sort">③ 分组排序</span><i>→</i>
+    <span class="pipe-step" data-stage="right">④ 右半枚举 + 二分</span><i>→</i>
+    <span class="pipe-step" data-stage="done">⑤ 答案</span>
+  </div>
+
+  <div class="hint">
+    <span id="stepInfo"></span><br>
+    <span id="hintText"></span>
+  </div>
+
+  <div class="panels">
+    <div class="panel" id="numsPanel"></div>
+    <div class="panel-grid">
+      <div class="panel" id="leftPanel"></div>
+      <div class="panel" id="rightPanel"></div>
+    </div>
+    <div class="panel" id="resultPanel"></div>
+  </div>
+</div>
+
+<script>
+"use strict";
+(function() {
+  // ---------- 工具 ----------
+  const $ = id => document.getElementById(id);
+  function popcount(x) {
+    let c = 0;
+    while (x) { c += x & 1; x >>>= 1; }
+    return c;
+  }
+  function signHTML(signs) {
+    return signs.map(s => s === 1
+      ? '<span class="sign-plus">+</span>'
+      : '<span class="sign-minus">−</span>').join('');
+  }
+  function signText(signs) {
+    return signs.map(s => s === 1 ? '+' : '-').join(' ');
+  }
+  function fmtArr(a) { return '[' + a.join(', ') + ']'; }
+  function signedTerm(s, v) {
+    const vv = v < 0 ? `(${v})` : `${v}`;
+    return (s === 1 ? '+' : '-') + vv;
+  }
+
+  // ---------- 全局状态 ----------
+  let nums = [3, 9, 7, 3];
+  let n = 0;
+  let left = [];
+  let right = [];
+  let leftRows = [];
+  let rightRows = [];
+  let leftGroups = [];
+  let steps = [];
+  let currentStep = 0;
+  let timer = null;
+
+  // ---------- 构建数据 ----------
+  function buildData() {
+    n = nums.length / 2;
+    left = nums.slice(0, n);
+    right = nums.slice(n);
+    leftRows = [];
+    rightRows = [];
+    const M = 1 << n;
+
+    for (let mask = 0; mask < M; mask++) {
+      const signs = [];
+      let sum = 0;
+      for (let i = 0; i < n; i++) {
+        const s = (mask & (1 << i)) ? 1 : -1;
+        signs.push(s);
+        sum += s * left[i];
+      }
+      leftRows.push({ id: mask, signs, k: popcount(mask), sum });
+    }
+
+    for (let mask = 0; mask < M; mask++) {
+      const signs = [];
+      let sum = 0;
+      for (let i = 0; i < n; i++) {
+        const s = (mask & (1 << i)) ? 1 : -1;
+        signs.push(s);
+        sum += s * right[i];
+      }
+      rightRows.push({ id: mask, signs, k: popcount(mask), sum });
+    }
+
+    leftGroups = [];
+    for (let k = 0; k <= n; k++) leftGroups.push([]);
+    for (const r of leftRows) leftGroups[r.k].push(r);
+    for (let k = 0; k <= n; k++) leftGroups[k].sort((a, b) => a.sum - b.sum);
+
+    // 构建步骤序列
+    steps = [];
+    steps.push({ type: 'formula', title: '问题转化' });
+    for (let i = 0; i < leftRows.length; i++) {
+      steps.push({ type: 'left', idx: i, title: '枚举左半(' + signText(leftRows[i].signs) + ')' });
+    }
+    steps.push({ type: 'sort', title: '左半分组排序' });
+    for (let i = 0; i < rightRows.length; i++) {
+      steps.push({ type: 'right', idx: i, title: '处理右半(' + signText(rightRows[i].signs) + ')' });
+    }
+    steps.push({ type: 'done', title: '完成' });
+  }
+
+  // ---------- 二分查找最接近目标 ----------
+  function nearestInGroup(group, target) {
+    let lo = 0, hi = group.length - 1;
+    if (target <= group[0].sum) return group[0];
+    if (target >= group[hi].sum) return group[hi];
+    while (lo + 1 < hi) {
+      const mid = (lo + hi) >> 1;
+      if (group[mid].sum < target) lo = mid;
+      else hi = mid;
+    }
+    return Math.abs(group[lo].sum - target) <= Math.abs(group[hi].sum - target) ? group[lo] : group[hi];
+  }
+
+  function processRight(row) {
+    const q = row.sum;
+    const needK = n - row.k;
+    const group = leftGroups[needK];
+    const target = -q;
+    const nearest = nearestInGroup(group, target);
+    const total = q + nearest.sum;
+    return {
+      rightRow: row,
+      q: q,
+      needK: needK,
+      target: target,
+      nearestRow: nearest,
+      p: nearest.sum,
+      total: total,
+      diff: Math.abs(total)
+    };
+  }
+
+  // ---------- 根据步骤号计算当前状态 ----------
+  function computeState(stepIndex) {
+    const state = {
+      stage: 'formula',
+      enumeratedLeftCount: 0,
+      sorted: false,
+      rightProcessed: [],
+      currentRight: null,
+      ans: Infinity,
+      best: null
+    };
+    for (let s = 0; s <= stepIndex; s++) {
+      const step = steps[s];
+      if (!step) continue;
+      if (step.type === 'formula') {
+        state.stage = 'formula';
+      } else if (step.type === 'left') {
+        state.stage = 'left';
+        state.enumeratedLeftCount++;
+      } else if (step.type === 'sort') {
+        state.stage = 'sort';
+        state.sorted = true;
+      } else if (step.type === 'right') {
+        const info = processRight(rightRows[step.idx]);
+        state.rightProcessed.push(info);
+        state.currentRight = info;
+        if (info.diff < state.ans) {
+          state.ans = info.diff;
+          state.best = info;
+        }
+        state.stage = 'right';
+      } else if (step.type === 'done') {
+        state.stage = 'done';
+        if (state.best) state.currentRight = state.best;
+      }
+    }
+    return state;
+  }
+
+  // ---------- 渲染 ----------
+  function renderNums(state) {
+    const h = [];
+    h.push('<h3>📦 数组拆分（折半）</h3>');
+    h.push('<div class="formula-box">');
+    h.push('最小化 <b>|sum(A) - sum(B)|</b>，等价于给每个元素分配符号：');
+    h.push(' <b>+1</b> 表示放入 A，<b>-1</b> 表示放入 B，且恰好 n 个 +1、n 个 -1。<br>');
+    h.push('注意这里的 +/− 是分组符号，原始元素可能为负数；贡献 = 符号 × 数值。');
+    h.push('</div>');
+    h.push('<div class="nums-line">');
+    h.push('<span class="half-label">左半 L</span>');
+    left.forEach(v => h.push(`<span class="chip left">${v}</span>`));
+    h.push('<span class="split">|</span>');
+    h.push('<span class="half-label">右半 R</span>');
+    right.forEach(v => h.push(`<span class="chip right">${v}</span>`));
+    h.push('</div>');
+    h.push(`<div class="nums-meta">n = ${n}，共 ${2 * n} 个数，每半需枚举 2^${n} = ${1 << n} 种符号。</div>`);
+    $('numsPanel').innerHTML = h.join('');
+  }
+
+  function renderLeftTable(state) {
+    const h = [];
+    h.push(state.sorted ? '<h3>① 左半结果：按 k 分组，组内排序</h3>' : '<h3>① 左半枚举</h3>');
+    h.push('<div class="table-wrap"><table><thead><tr>');
+    h.push('<th>#</th><th>符号</th><th>k</th><th>计算</th><th>和</th>');
+    h.push('</tr></thead><tbody>');
+
+    if (!state.sorted) {
+      for (let i = 0; i < leftRows.length; i++) {
+        const r = leftRows[i];
+        const enumerated = i < state.enumeratedLeftCount;
+        const isCur = state.stage === 'left' && i === state.enumeratedLeftCount - 1;
+        const cls = `${enumerated ? '' : 'dim'} ${isCur ? 'current-highlight' : ''}`;
+        h.push(`<tr class="${cls}">`);
+        h.push(`<td>${r.id}</td><td>${signHTML(r.signs)}</td><td>${r.k}</td>`);
+        h.push(`<td class="calc">${r.signs.map((s, i) => signedTerm(s, left[i])).join(' ')}</td>`);
+        h.push(`<td>${r.sum}</td></tr>`);
+      }
+    } else {
+      for (let k = 0; k <= n; k++) {
+        const hl = state.currentRight && state.currentRight.needK === k;
+        h.push(`<tr class="group-header ${hl ? 'group-active' : ''}"><td colspan="5">k = ${k}（共 ${leftGroups[k].length} 个）</td></tr>`);
+        for (const r of leftGroups[k]) {
+          const isSel = state.currentRight && state.currentRight.nearestRow.id === r.id;
+          h.push(`<tr class="${isSel ? 'nearest-row' : ''}">`);
+          h.push(`<td>${r.id}</td><td>${signHTML(r.signs)}</td><td>${r.k}</td>`);
+          h.push(`<td class="calc">${r.signs.map((s, i) => signedTerm(s, left[i])).join(' ')}</td>`);
+          h.push(`<td>${r.sum}</td></tr>`);
+        }
+      }
+    }
+    h.push('</tbody></table></div>');
+    $('leftPanel').innerHTML = h.join('');
+  }
+
+  function renderRightTable(state) {
+    const h = [];
+    h.push('<h3>② 右半枚举 + 二分匹配</h3>');
+    h.push('<div class="table-wrap"><table><thead><tr>');
+    h.push('<th>#</th><th>符号</th><th>k</th><th>右半和 q</th><th>需 k\'</th><th>目标 -q</th><th>选 p</th><th>p+q</th><th>|diff|</th>');
+    h.push('</tr></thead><tbody>');
+
+    for (let i = 0; i < rightRows.length; i++) {
+      const r = rightRows[i];
+      const info = state.rightProcessed.filter(x => x.rightRow.id === r.id)[0];
+      const isCur = state.currentRight && state.currentRight.rightRow.id === r.id;
+      let cls = '';
+      if (!info) cls = 'dim';
+      else if (isCur) cls = 'current-highlight';
+      else cls = 'processed';
+
+      h.push(`<tr class="${cls}">`);
+      h.push(`<td>${r.id}</td><td>${signHTML(r.signs)}</td><td>${r.k}</td>`);
+      h.push(`<td>${r.sum}</td><td>${n - r.k}</td><td>${-r.sum}</td>`);
+      if (info) {
+        h.push(`<td class="nearest-val">${info.p}</td>`);
+        h.push(`<td>${info.total}</td>`);
+        h.push(`<td class="${info.diff === state.ans ? 'best-diff' : ''}">${info.diff}</td>`);
+      } else {
+        h.push('<td>-</td><td>-</td><td>-</td>');
+      }
+      h.push('</tr>');
+    }
+    h.push('</tbody></table></div>');
+    $('rightPanel').innerHTML = h.join('');
+  }
+
+  function renderChart(info) {
+    const group = leftGroups[info.needK];
+    const sums = group.map(r => r.sum);
+    const target = info.target;
+    const allSums = leftRows.map(r => r.sum);
+    let min = Math.min(...allSums, target);
+    let max = Math.max(...allSums, target);
+    const span = max - min;
+    const margin = span === 0 ? 1 : span * 0.1;
+    min -= margin; max += margin;
+    const pos = v => ((v - min) / (max - min)) * 100;
+
+    let h = '<div class="chart-wrap"><div class="chart-scale">';
+    h += `<div class="target-line" style="left:${pos(target)}%"></div>`;
+    h += `<div class="target-tick" style="left:${pos(target)}%">target ${target}</div>`;
+    for (let i = 0; i < sums.length; i++) {
+      const s = sums[i];
+      const cls = s === info.p ? 'dot nearest' : 'dot';
+      const bottom = 6 + (i % 3) * 6;
+      h += `<div class="${cls}" style="left:${pos(s)}%; bottom:${bottom}px;" title="候选 ${s}">`;
+      h += `<span class="dot-label">${s}</span></div>`;
+    }
+    h += `<div class="scale-min-label">${min.toFixed(1)}</div>`;
+    h += `<div class="scale-max-label">${max.toFixed(1)}</div>`;
+    h += '</div><div class="chart-caption">蓝色：当前分组候选；紫色竖线：目标值；绿色：二分选中的最近点。</div></div>';
+    return h;
+  }
+
+  function getPartition(info) {
+    const A = [], B = [];
+    for (let i = 0; i < n; i++) (info.nearestRow.signs[i] === 1 ? A : B).push(left[i]);
+    for (let i = 0; i < n; i++) (info.rightRow.signs[i] === 1 ? A : B).push(right[i]);
+    return { A, B };
+  }
+
+  function renderResult(state) {
+    const h = [];
+    h.push('<h3>④ 二分查找与答案</h3>');
+
+    if (state.stage === 'done' && state.best) {
+      const { A, B } = getPartition(state.best);
+      const sumA = A.reduce((a, b) => a + b, 0);
+      const sumB = B.reduce((a, b) => a + b, 0);
+      h.push('<div class="final-answer">');
+      h.push('<h3>✅ 最终答案（一种最优分组）</h3>');
+      h.push(`<p>最小数组和之差 = <b>${state.ans}</b></p>`);
+      h.push(`<p>A（+号）= ${fmtArr(A)}，sum(A) = ${sumA}</p>`);
+      h.push(`<p>B（−号）= ${fmtArr(B)}，sum(B) = ${sumB}</p>`);
+      h.push(`<p>|sum(A) - sum(B)| = |${sumA} − (${sumB})| = ${state.ans}</p>`);
+      h.push('</div>');
+      h.push('<div class="complexity" style="margin-top:10px;font-size:13px;color:#64748b;">复杂度：每半枚举 2^n 种，排序 + 二分查找，总时间复杂度 O(n·2^n)，空间复杂度 O(2^n)。</div>');
+      $('resultPanel').innerHTML = h.join('');
+      return;
+    }
+
+    if (state.stage === 'formula') {
+      h.push('<div class="calc-block">先做问题转化：把分到第一个数组记为 +，分到第二个数组记为 −。</div>');
+    } else if (state.stage === 'left') {
+      h.push(`<div class="calc-block">正在枚举左半第 ${state.enumeratedLeftCount} / ${leftRows.length} 种符号组合。</div>`);
+    } else if (state.stage === 'sort') {
+      h.push('<div class="calc-block">左半枚举完毕。按 k 分组，组内按贡献和排序，方便之后二分查找。</div>');
+    } else if (state.currentRight) {
+      const info = state.currentRight;
+      const sums = leftGroups[info.needK].map(r => r.sum);
+      h.push('<div class="calc-block">');
+      h.push(`<div>当前右半：${signHTML(info.rightRow.signs)}，q = ${info.q}，正号个数 k = ${info.k}</div>`);
+      h.push(`<div>需要左半正号个数 = n − k = ${info.needK}</div>`);
+      h.push(`<div>左半候选 k=${info.needK} = [${sums.join(', ')}]</div>`);
+      h.push(`<div>目标 target = −q = ${info.target}</div>`);
+      h.push(`<div>二分查找最接近 target 的左半和：p = ${info.p}</div>`);
+      h.push(`<div>总符号和 = p + q = ${info.total}</div>`);
+      h.push(`<div>当前差值 = |${info.total}| = ${info.diff}</div>`);
+      h.push('</div>');
+      h.push(renderChart(info));
+    }
+
+    if (state.ans < Infinity) {
+      h.push(`<div class="current-answer">当前已找到的最小差值：<b>${state.ans}</b></div>`);
+    }
+    $('resultPanel').innerHTML = h.join('');
+  }
+
+  function hintText(state) {
+    switch (state.stage) {
+      case 'formula': return '问题转化：看成给每个元素分配 + 或 − 符号。';
+      case 'left': return `正在枚举左半第 ${state.enumeratedLeftCount} / ${leftRows.length} 种符号组合。`;
+      case 'sort': return '左半枚举完成，按 k 分组并排序。';
+      case 'right': return `正在处理右半第 ${state.rightProcessed.length} / ${rightRows.length} 种符号组合。`;
+      case 'done': return '全部组合处理完成，得到最小数组和之差。';
+      default: return '';
+    }
+  }
+
+  function render() {
+    const state = computeState(currentStep);
+    const step = steps[currentStep];
+    $('stepInfo').textContent = `步骤 ${currentStep + 1} / ${steps.length}：${step.title}`;
+    $('hintText').textContent = hintText(state);
+
+    document.querySelectorAll('.pipe-step').forEach(el => {
+      el.classList.toggle('active', el.dataset.stage === state.stage);
+    });
+
+    renderNums(state);
+    renderLeftTable(state);
+    renderRightTable(state);
+    renderResult(state);
+  }
+
+  // ---------- 控件 ----------
+  function stopAuto() {
+    if (timer) { clearInterval(timer); timer = null; $('autoBtn').textContent = '自动播放'; }
+  }
+  function stepBy(delta) {
+    stopAuto();
+    currentStep = Math.max(0, Math.min(steps.length - 1, currentStep + delta));
+    render();
+  }
+  function jumpToEnd() { stopAuto(); currentStep = steps.length - 1; render(); }
+  function reset() { stopAuto(); currentStep = 0; render(); }
+
+  function applyInput() {
+    stopAuto();
+    let raw = $('numsInput').value.trim();
+    const m = raw.match(/\[.*?]/);
+    if (m) raw = m[0];
+    raw = raw.replace(/^\[|\]$/g, '').replace(/，/g, ',');
+    const arr = raw.split(/[\s,]+/).filter(Boolean).map(Number);
+    if (arr.length < 2 || arr.length % 2 !== 0 || arr.some(x => !Number.isFinite(x))) {
+      alert('请输入偶数个整数，例如：3, 9, 7, 3');
+      return;
+    }
+    if (arr.length > 12) {
+      alert('为便于演示，元素个数不能超过 12。当前：' + arr.length);
+      return;
+    }
+    nums = arr;
+    buildData();
+    currentStep = 0;
+    render();
+  }
+
+  // ---------- 初始化 ----------
+  try {
+    buildData();
+    render();
+
+    $('applyBtn').addEventListener('click', applyInput);
+    $('exampleSelect').addEventListener('change', function() {
+      stopAuto();
+      nums = JSON.parse(this.value);
+      $('numsInput').value = nums.join(', ');
+      buildData();
+      currentStep = 0;
+      render();
+    });
+    $('prevBtn').addEventListener('click', () => stepBy(-1));
+    $('nextBtn').addEventListener('click', () => stepBy(1));
+    $('jumpBtn').addEventListener('click', jumpToEnd);
+    $('autoBtn').addEventListener('click', function() {
+      if (timer) { stopAuto(); return; }
+      if (currentStep >= steps.length - 1) { currentStep = 0; render(); }
+      timer = setInterval(() => {
+        if (currentStep < steps.length - 1) { currentStep++; render(); }
+        else stopAuto();
+      }, 800);
+      this.textContent = '暂停';
+    });
+    $('resetBtn').addEventListener('click', reset);
+  } catch (e) {
+    $('debug').style.display = 'block';
+    $('debug').textContent = '初始化失败：' + (e.message || e);
+  }
+})();
+</script>
+</body>
+</html>
\ No newline at end of file
