173 lines
7.4 KiB
HTML
173 lines
7.4 KiB
HTML
<!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>006. 三数之和 – 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>🟡 006. 三数之和 <span class="badge medium">中等</span></h1>
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<p class="subtitle">分类：双指针 ｜ 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: [-1,0,1,2,-1,-4], label: '示例1: [-1,0,1,2,-1,-4]'},
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{input: [0,1,1], label: '示例2: [0,1,1]'},
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{input: [0,0,0], label: '示例3: [0,0,0]'},
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];
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let nums, steps, stepCtrl;
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function buildSteps(arr) {
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nums = [...arr].sort((a,b) => a - b); steps = [];
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const result = [];
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steps.push({stage:'sort', msg:`排序: [${arr}] → [${nums}]`, arr:[...nums], i:-1, l:-1, r:-1, triplets:[], currentSum:null});
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for (let i = 0; i < nums.length - 2; i++) {
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if (i > 0 && nums[i] === nums[i-1]) continue;
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let l = i + 1, r = nums.length - 1;
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steps.push({stage:'fix', msg:`固定 nums[${i}]=${nums[i]}，双指针 [${l}..${r}]`, arr:[...nums], i, l, r, triplets:JSON.parse(JSON.stringify(result)), currentSum:null});
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while (l < r) {
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const sum = nums[i] + nums[l] + nums[r];
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steps.push({stage:'calc', msg:`${nums[i]}+${nums[l]}+${nums[r]}=${sum}` + (sum===0?' ✓':sum<0?' → L右移':' → R左移'), arr:[...nums], i, l, r, triplets:JSON.parse(JSON.stringify(result)), currentSum:sum});
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if (sum === 0) {
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result.push([nums[i], nums[l], nums[r]]);
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steps.push({stage:'found', msg:`找到 [${nums[i]},${nums[l]},${nums[r]}]`, arr:[...nums], i, l, r, triplets:JSON.parse(JSON.stringify(result)), currentSum:0});
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while (l < r && nums[l] === nums[l+1]) l++;
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while (l < r && nums[r] === nums[r-1]) r--;
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l++; r--;
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} else if (sum < 0) { l++; } else { r--; }
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}
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}
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steps.push({stage:'done', msg:`共找到 ${result.length} 个三元组`, arr:[...nums], i:-1, l:-1, r:-1, triplets:JSON.parse(JSON.stringify(result)), currentSum:null});
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}
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function render(step) {
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const s = steps[step];
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const hl = {};
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if (s.i>=0) hl[s.i] = s.stage==='found'?'green':'purple';
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if (s.l>=0) hl[s.l] = s.stage==='found'?'green':'orange';
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if (s.r>=0) hl[s.r] = s.stage==='found'?'green':'blue';
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const pointers = {};
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if (s.i>=0) pointers['i']=s.i; if (s.l>=0) pointers['L']=s.l; if (s.r>=0) pointers['R']=s.r;
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let viz = renderArray(s.arr, {highlights:hl, pointers});
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if (s.currentSum !== null) viz += `<div style="margin-top:8px;">和 = <b style="color:${s.currentSum===0?'var(--green)':s.currentSum<0?'var(--blue)':'var(--red)'};">${s.currentSum}</b></div>`;
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$('vizArea').innerHTML = viz;
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let detail = '<div class="calc-block">' + s.msg + '</div>';
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if (s.triplets.length > 0) { s.triplets.forEach((t,i)=>{ detail += `<div><code>${i+1}. [${t.join(', ')}]</code></div>`; }); }
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$('detailContent').innerHTML = detail;
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if (s.stage === 'done') {
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if (s.triplets.length > 0) $('resultContent').innerHTML = `<div class="final-answer">返回 <b>${JSON.stringify(s.triplets)}</b></div>`;
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else $('resultContent').innerHTML = '<div class="final-answer" style="border-color:#f87171;background:#fef2f2;">未找到</div>';
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}
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$('hintText').textContent = s.msg;
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const stages = ['sort→排序','fix→固定','calc→计算','found→找到','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 = '[-1,0,1,2,-1,-4]';
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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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try { const arr = JSON.parse($('inputArea').value); buildSteps(arr); stepCtrl.setSteps(steps.map((_,i)=>i)); render(0); $('stepInfo').textContent = '步骤 1 / ' + steps.length; }
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catch(e) { alert('请输入合法 JSON 数组'); }
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};
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$('exampleSelect').onchange = () => {
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const e = examples[parseInt($('exampleSelect').value)];
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$('inputArea').value = JSON.stringify(e.input); 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 threeSum(nums):
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nums.sort()
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res = []
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for i in range(len(nums) - 2):
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if i > 0 and nums[i] == nums[i-1]:
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continue
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l, r = i + 1, len(nums) - 1
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while l < r:
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s = nums[i] + nums[l] + nums[r]
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if s == 0:
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res.append([nums[i], nums[l], nums[r]])
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while l < r and nums[l] == nums[l+1]: l += 1
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while l < r and nums[r] == nums[r-1]: r -= 1
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l += 1; r -= 1
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elif s < 0: l += 1
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else: r -= 1
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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> |