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<!DOCTYPE html>
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<html lang="zh-Hans">
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<head>
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<meta charset="UTF-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<title>061. 分割回文串 – 图解</title>
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<link rel="stylesheet" href="../shared/style.css">
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<style>
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/* page-specific overrides */
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.vis-area { min-height: 120px; padding: 16px 0; }
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.code-section { margin-top: 16px; }
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</style>
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</head>
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<body>
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<div class="container">
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<h1>🟡 061. 分割回文串 <span class="badge medium">中等</span></h1>
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<p class="subtitle">分类：回溯 ｜ LeetCode Hot 100</p>
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<!-- 控制面板 -->
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<div class="controls" id="controls">
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<label for="inputArea">输入：</label>
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<input type="text" id="inputArea" placeholder="默认示例，可自定义">
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<button id="applyBtn" class="primary">生成图解</button>
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<select id="exampleSelect"></select>
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<span style="flex:1"></span>
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<button id="prevBtn">◀ 上一步</button>
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<button id="nextBtn">下一步 ▶</button>
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<button id="jumpBtn">⏭ 跳到结果</button>
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<button id="autoBtn">自动播放</button>
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<button id="resetBtn">重置</button>
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</div>
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<!-- 步骤流水线 -->
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<div class="pipeline" id="pipeline"></div>
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<!-- 提示条 -->
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<div class="hint info" id="hintBox">
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<span id="stepInfo"></span><br>
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<span id="hintText"></span>
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</div>
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<!-- 可视化面板 -->
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<div class="panels">
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<div class="panel" id="mainPanel">
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<h3>📊 可视化</h3>
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<div class="vis-area" id="vizArea">点击「生成图解」开始</div>
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</div>
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<div class="panel-grid">
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<div class="panel" id="detailPanel">
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<h3>📝 当前步骤详情</h3>
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<div id="detailContent">等待开始...</div>
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</div>
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<div class="panel" id="resultPanel">
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<h3>✅ 结果</h3>
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<div id="resultContent">等待完成...</div>
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</div>
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</div>
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</div>
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<!-- 代码 -->
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<div class="panel code-section">
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<h3>💻 参考代码（Python）</h3>
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<div id="codeArea"></div>
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</div>
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<footer>Powered by QwenPaw · 图解算法 · LeetCode Hot 100</footer>
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</div>
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<script src="../shared/algo-viz.js"></script>
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<script>
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"use strict";
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(function() {
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// ========== Algorithm Logic ==========
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const examples = [
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{input: "aab", label: '示例1: "aab"'},
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{input: "a", label: '示例2: "a"'},
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{input: "racecar", label: '示例3: "racecar"'},
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];
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let s, steps, stepCtrl;
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function isPalindrome(str, l, r) {
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while (l < r) { if (str[l] !== str[r]) return false; l++; r--; }
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return true;
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}
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function buildSteps(str) {
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s = str; steps = [];
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const result = [];
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const path = [];
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steps.push({stage:'start', msg:`对 "${str}" 进行回文分割`, path:[], start:0, checking:null, result:[]});
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function backtrack(start) {
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if (start === s.length) {
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result.push([...path]);
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steps.push({stage:'collect', msg:`分割完成: [${path.map(p=>'"'+p+'"').join(', ')}]`, path:[...path], start, checking:null, result:JSON.parse(JSON.stringify(result))});
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return;
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}
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for (let end = start; end < s.length; end++) {
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const sub = s.substring(start, end + 1);
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const isPalin = isPalindrome(s, start, end);
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steps.push({stage:'check', msg:`检查 "${sub}" (${start}..${end}): ${isPalin?'是回文 ✓':'不是回文 ✗'}`, path:[...path], start, checking:{from:start, to:end, isPalin}, result:JSON.parse(JSON.stringify(result))});
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if (isPalin) {
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path.push(sub);
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steps.push({stage:'choose', msg:`选择 "${sub}" 加入路径`, path:[...path], start:end+1, checking:null, result:JSON.parse(JSON.stringify(result))});
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backtrack(end + 1);
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path.pop();
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steps.push({stage:'undo', msg:`回溯：移除 "${sub}"`, path:[...path], start, checking:null, result:JSON.parse(JSON.stringify(result))});
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}
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}
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}
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backtrack(0);
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steps.push({stage:'done', msg:`共 ${result.length} 种分割方案`, path:[], start:-1, checking:null, result:JSON.parse(JSON.stringify(result))});
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}
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function render(step) {
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const st = steps[step];
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let viz = `<div style="font-size:20px;font-family:monospace;letter-spacing:2px;margin:12px 0;">`;
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// color the string by current path partitions
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let pos = 0;
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const parts = st.path;
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const colors = ['#dbeafe','#dcfce7','#ede9fe','#fff7ed','#cffafe','#fee2e2'];
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for (let pi=0; pi<parts.length; pi++) {
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const part = parts[pi];
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for (let j=0; j<part.length; j++) {
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viz += `<span style="background:${colors[pi%colors.length]};padding:2px 1px;border-radius:3px;">${part[j]}</span>`;
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pos++;
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}
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}
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// remaining chars
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for (let i=pos; i<s.length; i++) {
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const isChecking = st.checking && i>=st.checking.from && i<=st.checking.to;
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viz += `<span style="${isChecking?(st.checking.isPalin?'background:#dcfce7;':'background:#fee2e2;'):''}padding:2px 1px;border-radius:3px;">${s[i]}</span>`;
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}
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viz += '</div>';
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// path
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viz += `<div style="margin-top:8px;"><b>当前分割：</b>`;
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if (st.path.length > 0) {
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st.path.forEach((p,i) => { viz += `<span class="chip" style="min-width:auto;padding:2px 8px;background:${colors[i%colors.length]};font-size:12px;">"${p}"</span>`; });
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} else viz += '<span style="color:var(--text-muted);">空</span>';
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viz += '</div>';
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if (st.result.length > 0) {
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viz += '<div style="margin-top:8px;"><b>已找到：</b></div><div style="display:flex;flex-wrap:wrap;gap:4px;">';
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st.result.forEach(r => { viz += `<span class="chip green" style="min-width:auto;padding:2px 8px;font-size:11px;">[${r.map(x=>'"'+x+'"').join(',')}]</span>`; });
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viz += '</div>';
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}
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$('vizArea').innerHTML = viz;
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$('detailContent').innerHTML = '<div class="calc-block">' + st.msg + '</div>';
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if (st.stage==='done') $('resultContent').innerHTML = `<div class="final-answer">共 <b>${st.result.length}</b> 种分割方案</div>`;
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$('hintText').textContent = st.msg;
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const stages = ['start→开始','check→检查回文','choose→选择','collect→收集','undo→回溯','done→完成'];
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$('pipeline').innerHTML = stages.map(stt => { const [k,l]=stt.split('→'); return `<span class="pipe-step ${st.stage===k?'active':''}">${l}</span>`; }).join('<i>→</i>');
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}
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function init() {
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const sel = $('exampleSelect');
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examples.forEach((e,i) => { sel.innerHTML += `<option value="${i}">${e.label}</option>`; });
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$('inputArea').value = '"aab"';
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buildSteps(examples[0].input);
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stepCtrl = new StepController({onStep: render});
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stepCtrl.setSteps(steps.map((_,i)=>i));
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$('stepInfo').textContent = '步骤 1 / ' + steps.length;
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stepCtrl.onStep = (idx) => { render(idx); $('stepInfo').textContent = `步骤 ${idx+1} / ${steps.length}`; };
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$('applyBtn').onclick = () => {
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const v = $('inputArea').value.replace(/"/g,'').trim();
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buildSteps(v); stepCtrl.setSteps(steps.map((_,i)=>i)); render(0); $('stepInfo').textContent = '步骤 1 / ' + steps.length;
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};
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$('exampleSelect').onchange = () => {
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const e = examples[parseInt($('exampleSelect').value)];
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buildSteps(e.input); stepCtrl.setSteps(steps.map((_,i)=>i)); render(0);
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};
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$('prevBtn').onclick = () => stepCtrl.prev();
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$('nextBtn').onclick = () => stepCtrl.next();
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$('jumpBtn').onclick = () => stepCtrl.jumpToEnd();
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$('autoBtn').onclick = () => { const on = stepCtrl.toggleAuto(); $('autoBtn').textContent = on ? '暂停' : '自动播放'; };
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$('resetBtn').onclick = () => { stepCtrl.reset(); $('autoBtn').textContent = '自动播放'; };
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}
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init();
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$('codeArea').innerHTML = renderCode(`def partition(s):
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res = []
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def is_palindrome(sub, l, r):
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while l < r:
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if sub[l] != sub[r]: return False
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l += 1; r -= 1
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return True
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def backtrack(start, path):
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if start == len(s):
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res.append(path[:])
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return
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for end in range(start, len(s)):
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if is_palindrome(s, start, end):
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path.append(s[start:end+1])
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backtrack(end + 1, path)
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path.pop()
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backtrack(0, [])
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return res`, {lang:'Python'});
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})();
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</script>
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</body>
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</html>
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