184 lines
7.6 KiB
HTML
184 lines
7.6 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>057. 电话号码的字母组合 – 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>🟡 057. 电话号码的字母组合 <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: "23", label: '示例1: "23"'},
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{input: "", label: '示例2: 空'},
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{input: "2", label: '示例3: "2"'},
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];
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const digitMap = {'2':'abc','3':'def','4':'ghi','5':'jkl','6':'mno','7':'pqrs','8':'tuv','9':'wxyz'};
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let digits, steps, stepCtrl;
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function buildSteps(d) {
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digits = d; steps = [];
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const result = [];
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const path = [];
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if (d.length === 0) {
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steps.push({stage:'done', msg:'输入为空，返回空列表', path:[], digitIdx:-1, result:[]});
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return;
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}
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steps.push({stage:'start', msg:`输入: "${d}"，数字对应字母: ${d.split('').map(c=>c+'→'+digitMap[c]).join(' ')}`, path:[], digitIdx:0, result:[]});
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function backtrack(idx) {
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if (idx === digits.length) {
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result.push(path.join(''));
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steps.push({stage:'collect', msg:`组合完成: "${path.join('')}"`, path:[...path], digitIdx:idx, result:JSON.parse(JSON.stringify(result))});
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return;
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}
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const letters = digitMap[digits[idx]];
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for (const ch of letters) {
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path.push(ch);
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steps.push({stage:'choose', msg:`位置${idx}(数字${digits[idx]}): 选择字母 '${ch}'`, path:[...path], digitIdx:idx, result:JSON.parse(JSON.stringify(result))});
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backtrack(idx + 1);
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path.pop();
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steps.push({stage:'undo', msg:`回溯：移除 '${ch}'，尝试下一个字母`, path:[...path], digitIdx:idx, result:JSON.parse(JSON.stringify(result))});
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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} 个组合`, path:[], digitIdx:-1, result:JSON.parse(JSON.stringify(result))});
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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;gap:12px;margin-bottom:12px;">';
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digits.split('').forEach((d,i) => {
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const isCurr = i===s.digitIdx;
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viz += `<div style="text-align:center;padding:8px 12px;border-radius:10px;border:2px solid ${isCurr?'var(--orange)':'var(--border)'};background:${isCurr?'#fff7ed':'white'};">
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<div style="font-size:20px;font-weight:700;">${d}</div>
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<div style="font-size:12px;color:var(--text-secondary);">${digitMap[d]}</div>
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</div>`;
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});
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viz += '</div>';
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viz += `<div style="margin-top:8px;"><b>当前路径：</b><span style="font-size:18px;font-weight:700;letter-spacing:2px;color:var(--purple);">${s.path.join('')}</span><span style="color:var(--text-muted);">_`.repeat(Math.max(0, digits.length - s.path.length)) + '</span></div>';
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if (s.result.length > 0) {
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viz += '<div style="margin-top:8px;"><b>已找到：</b></div><div style="display:flex;flex-wrap:wrap;gap:4px;">';
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s.result.forEach(r => { viz += `<span class="chip green" style="min-width:auto;padding:2px 8px;font-size:12px;">${r}</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">' + s.msg + '</div>';
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if (s.stage==='done' && s.result.length > 0) $('resultContent').innerHTML = `<div class="final-answer">共 <b>${s.result.length}</b> 个组合<br>[${s.result.map(r=>'"'+r+'"').join(', ')}]</div>`;
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if (s.stage==='done' && s.result.length===0) $('resultContent').innerHTML = '<div class="final-answer">返回 []</div>';
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$('hintText').textContent = s.msg;
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const stages = ['start→开始','choose→选择字母','collect→收集','undo→回溯','done→完成'];
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$('pipeline').innerHTML = stages.map(st => { const [k,l]=st.split('→'); return `<span class="pipe-step ${s.stage===k?'active':''}">${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 = '"23"';
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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 letterCombinations(digits):
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if not digits:
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return []
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mapping = {'2':'abc','3':'def','4':'ghi','5':'jkl',
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'6':'mno','7':'pqrs','8':'tuv','9':'wxyz'}
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res = []
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def backtrack(idx, path):
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if idx == len(digits):
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res.append(''.join(path))
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return
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for ch in mapping[digits[idx]]:
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path.append(ch)
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backtrack(idx + 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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