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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>005. 盛最多水的容器 – 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>🟡 005. 盛最多水的容器 <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: [1,8,6,2,5,4,8,3,7], label: '示例1: [1,8,6,2,5,4,8,3,7]'},
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{input: [1,1], label: '示例2: [1,1]'},
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];
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let height, steps, stepCtrl;
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function buildSteps(arr) {
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height = [...arr]; steps = [];
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let left = 0, right = arr.length - 1, maxArea = 0;
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steps.push({stage:'init', msg:'双指针从两端开始，计算面积并移动较矮的一端', left, right, maxArea, area:0});
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while (left < right) {
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const h = Math.min(arr[left], arr[right]);
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const w = right - left;
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const area = h * w;
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maxArea = Math.max(maxArea, area);
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steps.push({stage:'calc', msg:`left=${left}(h=${arr[left]}) right=${right}(h=${arr[right]}) → 高度=${h} 宽度=${w} 面积=${area}`, left, right, maxArea, area});
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if (arr[left] < arr[right]) {
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steps.push({stage:'move', msg:`左边 ${arr[left]} < 右边 ${arr[right]}，移动左指针 → ${left+1}`, left:left+1, right, maxArea, area});
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left++;
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} else {
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steps.push({stage:'move', msg:`右边 ${arr[right]} ≤ 左边 ${arr[left]}，移动右指针 → ${right-1}`, left, right:right-1, maxArea, area});
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right--;
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}
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}
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steps.push({stage:'done', msg:`左右指针相遇，最大面积为 ${maxArea}`, left, right, maxArea, area:0});
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}
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function render(step) {
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const s = steps[step];
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const hl = {};
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if (s.left !== undefined) hl[s.left] = 'blue';
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if (s.right !== undefined) hl[s.right] = 'blue';
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for (let i = s.left+1; i < s.right; i++) hl[i] = 'default';
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let viz = renderArray(height, {highlights: hl, pointers: {L: s.left, R: s.right}});
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// draw bars
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viz += '<div style="display:flex;align-items:flex-end;gap:4px;height:120px;margin-top:12px;padding:8px 0;">';
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const maxH = Math.max(...height);
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height.forEach((h,i) => {
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const pct = (h / maxH * 100);
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const bg = i===s.left || i===s.right ? 'var(--blue)' : '#cbd5e1';
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viz += `<div style="width:36px;height:${pct}%;background:${bg};border-radius:4px 4px 0 0;display:flex;align-items:flex-start;justify-content:center;font-size:11px;font-weight:700;color:${i===s.left||i===s.right?'white':'#475569'};padding-top:4px;">${h}</div>`;
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});
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viz += '</div>';
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$('vizArea').innerHTML = viz;
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$('detailContent').innerHTML = '<div class="calc-block">' + s.msg + '</div>';
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if (s.maxArea > 0) $('detailContent').innerHTML += `<div class="current-answer">最大面积：<b>${s.maxArea}</b></div>`;
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if (s.stage === 'done') {
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$('resultContent').innerHTML = `<div class="final-answer">最大盛水量 = <b>${s.maxArea}</b></div>`;
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}
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$('hintText').textContent = s.msg;
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const stages = ['init→初始化','calc→计算','move→移动','done→完成'];
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$('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 = '[1,8,6,2,5,4,8,3,7]';
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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($('inputArea').value); buildSteps(arr); stepCtrl.setSteps(steps.map((_,i)=>i)); render(0); }
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catch(e) { alert('请输入合法 JSON 数组'); }
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};
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$('exampleSelect').onchange = () => {
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const e = examples[parseInt($('exampleSelect').value)];
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$('inputArea').value = JSON.stringify(e.input);
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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 maxArea(height):
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left, right = 0, len(height) - 1
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max_area = 0
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while left < right:
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h = min(height[left], height[right])
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w = right - left
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max_area = max(max_area, h * w)
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if height[left] < height[right]:
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left += 1
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else:
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right -= 1
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return max_area`, {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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