177 lines
7.1 KiB
HTML
177 lines
7.1 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>081. 爬楼梯 – 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>🟢 081. 爬楼梯 <span class="badge easy">简单</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: 5, label: '示例1: n=5'},
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{input: 3, label: '示例2: n=3'},
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{input: 10, label: '示例3: n=10'},
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];
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let steps, stepCtrl, n;
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function buildSteps(total) {
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n = total; steps = [];
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const dp = new Array(n + 1).fill(0);
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dp[0] = 0; dp[1] = 1; dp[2] = 2;
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steps.push({stage:'init', msg:'初始化：dp[1]=1（1种），dp[2]=2（2种）', dp:[...dp], current:-1, from1:-1, from2:-1});
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for (let i = 3; i <= n; i++) {
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steps.push({stage:'calc', msg:`计算 dp[${i}] = dp[${i-1}] + dp[${i-2}] = ${dp[i-1]} + ${dp[i-2]} = ${dp[i-1]+dp[i-2]}`, dp:[...dp], current:i, from1:i-1, from2:i-2});
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dp[i] = dp[i-1] + dp[i-2];
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steps.push({stage:'fill', msg:`dp[${i}] = ${dp[i]}，已填充`, dp:[...dp], current:i, from1:i-1, from2:i-2});
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}
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steps.push({stage:'done', msg:`结果：爬到第 ${n} 阶有 ${dp[n]} 种方法`, dp:[...dp], current:n, from1:-1, from2:-1});
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}
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function render(step) {
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const s = steps[step];
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let viz = '<div style="display:flex;align-items:flex-end;gap:3px;margin:12px 0 8px;">';
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for (let i = 1; i <= n; i++) {
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const filled = s.dp[i] > 0;
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const isCurrent = i === s.current;
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const isFrom1 = i === s.from1;
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const isFrom2 = i === s.from2;
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let bg = '#e2e8f0', color = '#64748b';
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if (isCurrent && (s.stage==='fill'||s.stage==='done')) { bg = 'var(--green)'; color = 'white'; }
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else if (isCurrent) { bg = 'var(--orange)'; color = 'white'; }
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else if (isFrom1) { bg = '#dbeafe'; color = '#1e40af'; }
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else if (isFrom2) { bg = '#ede9fe'; color = '#5b21b6'; }
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else if (filled) { bg = '#f0fdf4'; color = '#166534'; }
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viz += `<div style="width:42px;height:${36+i*6}px;background:${bg};border-radius:6px 6px 0 0;display:flex;flex-direction:column;align-items:center;justify-content:flex-end;padding:4px 0;font-size:11px;font-weight:600;color:${color};transition:all 0.3s;">
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<span style="font-size:13px;">${s.dp[i]||''}</span><span style="font-size:9px;opacity:0.7;">${i}</span></div>`;
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}
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viz += '</div>';
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viz += '<div style="margin-top:12px;"><b>dp 表：</b></div>';
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const dpHl = {};
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if (s.current > 0) dpHl[s.current-1] = s.stage==='fill'?'green':'orange';
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if (s.from1 > 0) dpHl[s.from1-1] = 'blue';
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if (s.from2 > 0) dpHl[s.from2-1] = 'purple';
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viz += renderArray(s.dp.slice(1), {highlights: dpHl});
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if (s.stage === 'calc') {
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viz += `<div class="formula-box" style="margin-top:8px;">dp[${s.current}] = dp[${s.from1}] + dp[${s.from2}] = ${s.dp[s.from1]} + ${s.dp[s.from2]}</div>`;
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}
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$('vizArea').innerHTML = viz;
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$('detailContent').innerHTML = '<div class="calc-block">' + s.msg + '</div>';
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if (s.stage !== 'done' && s.current > 0) {
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$('detailContent').innerHTML += `<div class="current-answer">dp[${s.current}] = <b>${s.dp[s.current]}</b></div>`;
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}
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if (s.stage === 'done') {
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$('resultContent').innerHTML = `<div class="final-answer">爬到第 ${n} 阶有 <b>${s.dp[n]}</b> 种方法</div>`;
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}
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$('hintText').textContent = s.msg;
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const stages = ['init→初始化','calc→递推计算','fill→填充','done→完成'];
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$('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 = 'n=5';
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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(/n=(\d+)/);
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if (!m) { alert('格式: n=5'); return; }
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buildSteps(parseInt(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 = `n=${e.input}`;
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buildSteps(e.input); stepCtrl.setSteps(steps.map((_,i)=>i)); render(0);
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};
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$('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 climbStairs(n):
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if n <= 2: return n
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dp = [0] * (n + 1)
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dp[1], dp[2] = 1, 2
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for i in range(3, n + 1):
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dp[i] = dp[i-1] + dp[i-2]
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return dp[n]`, {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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