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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>071. 字符串解码 – 图解</title>
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<link rel="stylesheet" href="../shared/style.css">
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<style>
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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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.char-box { display:inline-flex; align-items:center; justify-content:center; min-width:28px; height:32px; border-radius:6px; font-weight:700; font-size:14px; margin:1px; padding:0 4px; transition:all 0.25s; }
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.char-box.default { background:#e2e8f0; color:var(--text); }
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.char-box.digit { background:#dbeafe; color:#1e40af; }
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.char-box.current { background:#fef3c7; color:#92400e; box-shadow:0 0 0 2px rgba(245,158,11,0.3); }
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.char-box.open { background:#ede9fe; color:#5b21b6; }
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.char-box.close { background:#ede9fe; color:#5b21b6; }
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.char-box.decoded { background:#dcfce7; color:#166534; }
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.dual-stack { display:flex; gap:16px; flex-wrap:wrap; }
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.dual-stack > div { flex:1; min-width:140px; }
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.decode-result { margin-top:10px; padding:10px 14px; background:#f0fdf4; border-radius:8px; font-family:monospace; font-size:14px; word-break:break-all; }
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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>🟡 071. 字符串解码 <span class="badge medium">中等</span></h1>
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<p class="subtitle">分类：栈 ｜ LeetCode Hot 100</p>
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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='s="3[a2[c]]"'>
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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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<div class="pipeline" id="pipeline"></div>
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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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<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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<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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const examples = [
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{s:'3[a2[c]]', label:'示例1: 3[a2[c]]'},
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{s:'3[a]2[bc]', label:'示例2: 3[a]2[bc]'},
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{s:'2[abc]3[cd]ef', label:'示例3: 2[abc]3[cd]ef'},
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{s:'10[a]', label:'示例4: 10[a]'},
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];
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let sStr, steps, stepCtrl;
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function buildSteps(s) {
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sStr = s;
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steps = [];
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const countStack = [];
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const strStack = [];
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let currentStr = '';
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let num = 0;
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steps.push({stage:'init', msg:'初始化：数字栈、字符串栈均为空，当前字符串为空', idx:-1, countStack:[], strStack:[], currentStr:'', num:0, charStatus:{}, decodedStr:''});
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for (let i = 0; i < s.length; i++) {
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const c = s[i];
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const charStatus = {};
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// Mark previous as decoded
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for (let j = 0; j < i; j++) charStatus[j] = 'decoded';
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charStatus[i] = 'current';
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if (c >= '0' && c <= '9') {
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num = num * 10 + parseInt(c);
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steps.push({stage:'digit', msg:`'${c}' 是数字，累计 num = ${num}`, idx:i, countStack:[...countStack], strStack:[...strStack], currentStr, num, charStatus, decodedStr:currentStr});
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} else if (c === '[') {
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countStack.push(num);
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strStack.push(currentStr);
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steps.push({stage:'open', msg:`遇到 '['，将 num=${num} 入数字栈，"${currentStr}" 入字符串栈，重置`, idx:i, countStack:[...countStack], strStack:[...strStack], currentStr:'', num:0, charStatus, decodedStr:strStack[strStack.length-1]||''});
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currentStr = '';
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num = 0;
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} else if (c === ']') {
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const repeatCount = countStack.pop();
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const prevStr = strStack.pop();
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const decoded = prevStr + currentStr.repeat(repeatCount);
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steps.push({stage:'close', msg:`遇到 ']'，弹出数字 ${repeatCount}，弹出字符串 "${prevStr}"，解码："${prevStr}" + "${currentStr}"×${repeatCount} = "${decoded}"`, idx:i, countStack:[...countStack], strStack:[...strStack], currentStr:decoded, num:0, charStatus, decodedStr:decoded});
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currentStr = decoded;
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} else {
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currentStr += c;
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steps.push({stage:'letter', msg:`'${c}' 是字母，拼接到当前字符串 "${currentStr}"`, idx:i, countStack:[...countStack], strStack:[...strStack], currentStr, num, charStatus, decodedStr:currentStr});
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}
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}
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steps.push({stage:'done', msg:`解码完成：${currentStr}`, idx:s.length, countStack:[], strStack:[], currentStr, num:0, charStatus:{}, decodedStr:currentStr});
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}
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function render(step) {
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const s = steps[step];
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// String display
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let viz = '<div style="margin-bottom:10px;"><b>输入字符串：</b><div style="display:flex;flex-wrap:wrap;">';
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for (let i = 0; i < sStr.length; i++) {
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const c = sStr[i];
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let cls = s.charStatus[i] || 'default';
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if (cls === 'current') {
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if (c >= '0' && c <= '9') cls = 'digit current';
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else if (c === '[') cls = 'open current';
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else if (c === ']') cls = 'close current';
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else cls = 'current';
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} else if (cls === 'decoded') {
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cls = 'decoded';
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} else if (c >= '0' && c <= '9') {
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cls = 'digit';
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} else if (c === '[' || c === ']') {
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cls = 'open';
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}
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viz += `<span class="char-box ${cls}">${c}</span>`;
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}
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viz += '</div></div>';
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// Stacks
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viz += '<div class="dual-stack">';
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viz += '<div><b>数字栈</b>';
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viz += renderStack(s.countStack.map(String), {topIndex: s.countStack.length - 1});
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viz += '</div>';
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viz += '<div><b>字符串栈</b>';
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viz += renderStack(s.strStack.map(v => v.length > 12 ? v.substring(0,12)+'…' : v), {topIndex: s.strStack.length - 1});
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viz += '</div>';
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viz += '</div>';
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viz += `<div style="margin-top:8px;font-size:13px;"><b>当前字符串：</b><code>${s.currentStr || '(空)'}</code></div>`;
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if (s.num > 0) {
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viz += `<div style="font-size:13px;color:var(--blue);"><b>累计数字：</b>${s.num}</div>`;
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}
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$('vizArea').innerHTML = viz;
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let detail = `<div class="calc-block">${s.msg}</div>`;
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detail += '<div style="margin-top:6px;font-size:12px;color:var(--text-secondary);">核心：遇到 [ 入栈保存状态，遇到 ] 出栈解码</div>';
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$('detailContent').innerHTML = detail;
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if (s.stage === 'done') {
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$('resultContent').innerHTML = `<div class="final-answer">解码结果：<b>${s.decodedStr}</b><br>时间复杂度 O(n)，空间 O(n)</div>`;
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}
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$('hintText').textContent = s.msg;
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const stages = ['init→开始','digit→数字','open→入栈','letter→字母','close→解码','done→完成'];
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$('pipeline').innerHTML = stages.map(st => {
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const [k,l] = st.split('→');
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return `<span class="pipe-step ${s.stage===k?'active':''}">${l}</span>`;
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}).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 = 's="3[a2[c]]"';
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buildSteps(examples[0].s);
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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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try {
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const m = $('inputArea').value.match(/s="([^"]+)"/);
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if (!m) { alert('格式: s="3[a2[c]]"'); return; }
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buildSteps(m[1]);
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stepCtrl.setSteps(steps.map((_,i)=>i)); render(0);
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$('stepInfo').textContent = `步骤 1 / ${steps.length}`;
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} catch(e) { alert('输入格式错误'); }
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};
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$('exampleSelect').onchange = () => {
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const e = examples[parseInt($('exampleSelect').value)];
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$('inputArea').value = `s="${e.s}"`;
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buildSteps(e.s);
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stepCtrl.setSteps(steps.map((_,i)=>i)); render(0);
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};
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$('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 decodeString(s: str) -> str:
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count_stack = []
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str_stack = []
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current = ''
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num = 0
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for c in s:
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if c.isdigit():
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num = num * 10 + int(c)
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elif c == '[':
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count_stack.append(num)
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str_stack.append(current)
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current = ''
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num = 0
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elif c == ']':
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repeat = count_stack.pop()
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prev = str_stack.pop()
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current = prev + current * repeat
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else:
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current += c
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return current`, {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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Reference in New Issue
Block a user