219 lines
8.7 KiB
HTML
219 lines
8.7 KiB
HTML
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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>090. 最长有效括号 – 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>🔴 090. 最长有效括号 <span class="badge hard">困难</span></h1>
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<p class="subtitle">分类：动态规划 ｜ 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: '(()', label: '示例1: "(()"'},
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{input: ')()())', label: '示例2: ")()())"'},
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{input: '', label: '示例3: ""'},
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];
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let s, steps, stepCtrl;
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function buildSteps(str) {
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s = str; steps = [];
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if (str.length === 0) {
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steps.push({stage:'done', msg:'空字符串，结果为 0', dp:[], stack:[-1], maxLen:0, current:-1, matched:-1});
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return;
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}
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const n = str.length;
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const dp = new Array(n).fill(0);
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const stackArr = [-1];
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let maxLen = 0;
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steps.push({stage:'init', msg:'用栈方法：栈中保存索引，初始压入 -1 作为基线', dp:[...dp], stack:[-1], maxLen:0, current:-1, matched:-1});
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for (let i = 0; i < n; i++) {
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steps.push({stage:'check', msg:`处理 s[${i}]='${str[i]}'`, dp:[...dp], stack:[...stackArr], maxLen, current:i, matched:-1});
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if (str[i] === '(') {
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stackArr.push(i);
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steps.push({stage:'push', msg:`遇到 '('，压入索引 ${i}`, dp:[...dp], stack:[...stackArr], maxLen, current:i, matched:-1});
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} else {
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if (stackArr.length > 1) {
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stackArr.pop();
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const start = stackArr[stackArr.length - 1];
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const len = i - start;
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maxLen = Math.max(maxLen, len);
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dp[i] = len;
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steps.push({stage:'pop', msg:`遇到 ')'，弹出栈顶，栈顶=${start}，有效长度=${i}-${start}=${len}`, dp:[...dp], stack:[...stackArr], maxLen, current:i, matched:start});
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} else {
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stackArr.length = 0;
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stackArr.push(i);
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steps.push({stage:'reset', msg:`遇到 ')' 但栈空（无匹配），重置基线为 ${i}`, dp:[...dp], stack:[...stackArr], maxLen, current:i, matched:-1});
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}
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}
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}
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steps.push({stage:'done', msg:`最长有效括号子串长度 = ${maxLen}`, dp:[...dp], stack:[...stackArr], maxLen, current:-1, matched:-1});
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}
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function render(step) {
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const st = steps[step];
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if (!st.dp || st.dp.length === 0) {
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$('vizArea').innerHTML = '<div class="formula-box">空字符串，结果为 0</div>';
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$('detailContent').innerHTML = '<div class="calc-block">' + st.msg + '</div>';
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$('resultContent').innerHTML = '<div class="final-answer">最长有效括号长度 = <b>0</b></div>';
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$('hintText').textContent = st.msg;
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$('pipeline').innerHTML = '<span class="pipe-step active">完成</span>';
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return;
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}
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let viz = '<div style="margin-top:8px;"><b>字符串：</b></div>';
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viz += '<div style="display:flex;gap:3px;margin:8px 0;">';
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for (let i = 0; i < s.length; i++) {
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let cls = 'default';
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if (i === st.current) cls = 'orange';
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else if (st.dp[i] > 0) cls = 'green';
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else if (i === st.matched) cls = 'blue';
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viz += `<span class="chip ${cls}" style="min-width:28px;font-size:14px;">${s[i]}</span>`;
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}
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viz += '</div>';
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viz += '<div style="display:flex;gap:3px;margin-top:-4px;">';
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for (let i = 0; i < s.length; i++) {
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viz += `<span style="min-width:28px;text-align:center;font-size:10px;color:var(--text-muted);">${i}</span>`;
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}
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viz += '</div>';
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viz += '<div style="margin-top:8px;"><b>dp 值（以各位置结尾的有效长度）：</b></div>';
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viz += '<div style="display:flex;gap:3px;margin:4px 0;">';
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for (let i = 0; i < s.length; i++) {
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let cls = st.dp[i] > 0 ? 'green' : 'default';
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if (i === st.current) cls = 'orange';
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viz += `<span class="chip ${cls}" style="min-width:28px;font-size:12px;height:28px;">${st.dp[i]}</span>`;
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}
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viz += '</div>';
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if (st.stack) {
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viz += '<div style="margin-top:8px;"><b>栈：</b></div>';
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viz += '<div style="display:flex;gap:3px;flex-wrap:wrap;margin:4px 0;">';
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st.stack.forEach((v, idx) => {
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const cls = idx === st.stack.length - 1 ? 'blue' : 'default';
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viz += `<span class="chip ${cls}" style="min-width:28px;font-size:12px;height:28px;">${v}</span>`;
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});
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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.maxLen > 0) {
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$('detailContent').innerHTML += `<div class="current-answer">当前最长有效长度：<b>${st.maxLen}</b></div>`;
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}
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if (st.stage === 'done') {
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$('resultContent').innerHTML = `<div class="final-answer">最长有效括号子串长度 = <b>${st.maxLen}</b></div>`;
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}
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$('hintText').textContent = st.msg;
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const stages = ['init→初始化','check→检查','push→入栈','pop→匹配','reset→重置','done→完成'];
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$('pipeline').innerHTML = stages.map(st2 => {
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const [k,l] = st2.split('→');
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return `<span class="pipe-step ${st.stage===k?'active':''}">${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 = '"(()"';
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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 m = $('inputArea').value.match(/"([^"]+)"/);
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if (!m) { alert('格式: "(()"'); return; }
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buildSteps(m[1]);
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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($('exampleSelect').value)];
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$('inputArea').value = `"${e.input}"`;
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buildSteps(e.input); stepCtrl.setSteps(steps.map((_,i)=>i)); render(0);
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};
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$('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 longestValidParentheses(s):
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stack = [-1]
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max_len = 0
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for i, c in enumerate(s):
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if c == '(':
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stack.append(i)
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else:
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stack.pop()
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if not stack:
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stack.append(i)
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else:
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max_len = max(max_len, i - stack[-1])
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return max_len`, {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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