188 lines
7.4 KiB
HTML
188 lines
7.4 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>082. 杨辉三角 – 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>🟢 082. 杨辉三角 <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: numRows=5'},
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{input: 1, label: '示例2: numRows=1'},
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{input: 7, label: '示例3: numRows=7'},
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];
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let steps, stepCtrl, numRows;
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function buildSteps(n) {
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numRows = n; steps = [];
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const triangle = [];
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steps.push({stage:'init', msg:'开始生成杨辉三角，每行首尾为1，中间元素 = 上方两数之和', triangle:[], row:-1, col:-1});
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for (let i = 0; i < numRows; i++) {
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const row = new Array(i + 1).fill(1);
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steps.push({stage:'newRow', msg:`第 ${i} 行共 ${i+1} 个元素，首尾均为 1`, triangle:JSON.parse(JSON.stringify(triangle)), row:i, col:-1});
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for (let j = 1; j < i; j++) {
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row[j] = triangle[i-1][j-1] + triangle[i-1][j];
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steps.push({stage:'calc', msg:`triangle[${i}][${j}] = triangle[${i-1}][${j-1}] + triangle[${i-1}][${j}] = ${triangle[i-1][j-1]} + ${triangle[i-1][j]} = ${row[j]}`, triangle:JSON.parse(JSON.stringify(triangle)), row:i, col:j});
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}
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triangle.push([...row]);
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steps.push({stage:'fillRow', msg:`第 ${i} 行填充完毕：[${row.join(', ')}]`, triangle:JSON.parse(JSON.stringify(triangle)), row:i, col:i});
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}
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steps.push({stage:'done', msg:`杨辉三角生成完毕，共 ${numRows} 行`, triangle:JSON.parse(JSON.stringify(triangle)), row:-1, col:-1});
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}
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function render(step) {
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const s = steps[step];
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let viz = '<div style="display:flex;flex-direction:column;align-items:center;gap:4px;padding:12px 0;">';
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const maxRow = s.triangle.length;
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for (let i = 0; i < maxRow; i++) {
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const gap = Math.max(2, (maxRow - i) * 6);
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viz += `<div style="display:flex;gap:${gap}px;justify-content:center;">`;
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for (let j = 0; j <= i; j++) {
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const val = s.triangle[i][j];
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let cls = 'default';
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if (i === s.row && s.stage !== 'done') {
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cls = j === s.col ? 'orange' : 'green';
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}
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if (s.stage === 'calc' && i === s.row - 1 && (j === s.col - 1 || j === s.col)) {
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cls = 'blue';
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}
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viz += `<span class="chip ${cls}" style="min-width:32px;height:28px;font-size:13px;">${val}</span>`;
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}
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viz += '</div>';
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}
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if (s.stage === 'newRow' || s.stage === 'calc') {
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viz += `<div style="display:flex;gap:2px;justify-content:center;margin-top:2px;">`;
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for (let j = 0; j <= s.row; j++) {
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viz += `<span style="min-width:32px;height:28px;border:2px dashed var(--orange);border-radius:10px;display:flex;align-items:center;justify-content:center;font-size:13px;color:var(--text-muted);">?</span>`;
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}
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viz += '</div>';
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}
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viz += '</div>';
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$('vizArea').innerHTML = viz;
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let detail = '<div class="calc-block">' + s.msg + '</div>';
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if (s.triangle.length > 0) {
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detail += '<div style="margin-top:8px;"><b>当前三角：</b></div>';
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s.triangle.forEach((row, i) => {
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detail += `<div style="margin:2px 0;"><code>${i}: [${row.join(', ')}]</code></div>`;
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});
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}
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$('detailContent').innerHTML = detail;
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if (s.stage === 'done') {
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$('resultContent').innerHTML = `<div class="final-answer">杨辉三角 <b>${numRows}</b> 行已生成</div>`;
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}
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$('hintText').textContent = s.msg;
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const stages = ['init→开始','newRow→新行','calc→计算','fillRow→填充','done→完成'];
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$('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 = 'numRows=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(/numRows=(\d+)/);
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if (!m) { alert('格式: numRows=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 = `numRows=${e.input}`;
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buildSteps(e.input); stepCtrl.setSteps(steps.map((_,i)=>i)); render(0);
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};
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$('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 generate(numRows):
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triangle = []
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for i in range(numRows):
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row = [1] * (i + 1)
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for j in range(1, i):
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row[j] = triangle[i-1][j-1] + triangle[i-1][j]
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triangle.append(row)
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return triangle`, {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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