180 lines
7.6 KiB
HTML
180 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>058. 组合总和 – 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>🟡 058. 组合总和 <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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{candidates: [2,3,6,7], target: 7, label: '示例1: [2,3,6,7] target=7'},
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{candidates: [2,3,5], target: 8, label: '示例2: [2,3,5] target=8'},
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{candidates: [2], target: 1, label: '示例3: [2] target=1'},
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];
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let cands, target, steps, stepCtrl;
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function buildSteps(arr, tgt) {
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cands = [...arr].sort((a,b)=>a-b); target = tgt; steps = [];
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const result = [];
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const path = [];
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steps.push({stage:'start', msg:`排序后: [${cands}], 目标: ${tgt}`, path:[], sum:0, remain:tgt, start:0, result:[]});
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function backtrack(start, sum) {
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if (sum === target) {
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result.push([...path]);
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steps.push({stage:'found', msg:`和=${target}，找到组合 [${path}]`, path:[...path], sum, remain:0, start, result:JSON.parse(JSON.stringify(result))});
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return;
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}
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for (let i = start; i < cands.length; i++) {
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if (sum + cands[i] > target) {
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steps.push({stage:'prune', msg:`${sum}+${cands[i]}=${sum+cands[i]} > ${target}，剪枝 ✂️`, path:[...path], sum, remain:target-sum, start:i, result:JSON.parse(JSON.stringify(result))});
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break; // sorted, so all following are larger
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}
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path.push(cands[i]);
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steps.push({stage:'choose', msg:`选择 ${cands[i]}，sum=${sum}+${cands[i]}=${sum+cands[i]}，remain=${target-sum-cands[i]}`, path:[...path], sum:sum+cands[i], remain:target-sum-cands[i], start:i, result:JSON.parse(JSON.stringify(result))});
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backtrack(i, sum + cands[i]);
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path.pop();
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steps.push({stage:'undo', msg:`回溯：移除 ${cands[i]}`, path:[...path], sum, remain:target-sum, start:i, result:JSON.parse(JSON.stringify(result))});
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}
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}
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backtrack(0, 0);
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steps.push({stage:'done', msg:`共 ${result.length} 个组合`, path:[], sum:0, remain:target, start:-1, result:JSON.parse(JSON.stringify(result))});
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}
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function render(step) {
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const s = steps[step];
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const hl = {};
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if (s.start >= 0) for (let i=s.start; i<cands.length; i++) hl[i] = i===s.start?'orange':'default';
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let viz = '<div style="margin-bottom:8px;"><b>候选数：</b></div>';
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viz += renderArray(cands, {highlights:hl});
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viz += `<div style="margin-top:10px;display:flex;gap:16px;">
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<span><b>当前组合：</b><span class="chip purple" style="min-width:auto;padding:2px 10px;">[${s.path.join(', ')}]</span></span>
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<span><b>sum：</b>${s.sum}</span>
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<span><b>remain：</b><span style="color:${s.remain===0?'var(--green)':'var(--blue)'};">${s.remain}</span></span>
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</div>`;
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if (s.result.length > 0) {
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viz += '<div style="margin-top:8px;"><b>已找到：</b></div><div style="display:flex;flex-wrap:wrap;gap:4px;">';
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s.result.forEach(r => { viz += `<span class="chip green" style="min-width:auto;padding:2px 8px;font-size:12px;">[${r.join(',')}]</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') $('resultContent').innerHTML = `<div class="final-answer">共 <b>${s.result.length}</b> 个组合</div>`;
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$('hintText').textContent = s.msg;
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const stages = ['start→开始','choose→选择','found→找到','prune→剪枝','undo→回溯','done→完成'];
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$('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 = '[2,3,6,7], target=7';
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buildSteps(examples[0].candidates, examples[0].target);
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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(/\[([^\]]+)\].*?(\d+)/);
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if (!m) { alert('格式: [2,3,6,7], target=7'); return; }
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const arr = m[1].split(',').map(Number);
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buildSteps(arr, parseInt(m[2])); 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($('exampleSelect').value)];
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buildSteps(e.candidates, e.target); stepCtrl.setSteps(steps.map((_,i)=>i)); render(0);
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};
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$('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 combinationSum(candidates, target):
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candidates.sort()
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res = []
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def backtrack(start, path, remaining):
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if remaining == 0:
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res.append(path[:])
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return
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for i in range(start, len(candidates)):
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if candidates[i] > remaining:
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break # 剪枝
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path.append(candidates[i])
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backtrack(i, path, remaining - candidates[i])
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path.pop()
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backtrack(0, [], target)
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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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