170 lines
7.7 KiB
HTML
170 lines
7.7 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>007. 接雨水 – 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>🔴 007. 接雨水 <span class="badge hard">困难</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: [0,1,0,2,1,0,1,3,2,1,2,1], label: '示例1: [0,1,0,2,1,0,1,3,2,1,2,1]'},
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{input: [4,2,0,3,2,5], label: '示例2: [4,2,0,3,2,5]'},
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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;
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let leftMax = arr[left], rightMax = arr[right];
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let totalWater = 0;
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const waterAt = new Array(arr.length).fill(0);
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steps.push({stage:'init', msg:`双指针从两端开始，left_max=${leftMax}，right_max=${rightMax}`, left, right, leftMax, rightMax, totalWater, waterAt:[...waterAt]});
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while (left < right) {
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if (leftMax <= rightMax) {
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const water = Math.max(0, leftMax - arr[left]);
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waterAt[left] = water; totalWater += water;
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steps.push({stage:'calcL', msg:`左端: min(${leftMax},${rightMax})=${leftMax}, h[${left}]=${arr[left]}, 储水=${water}`, left, right, leftMax, rightMax, totalWater, waterAt:[...waterAt]});
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left++; leftMax = Math.max(leftMax, arr[left]);
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} else {
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const water = Math.max(0, rightMax - arr[right]);
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waterAt[right] = water; totalWater += water;
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steps.push({stage:'calcR', msg:`右端: min(${leftMax},${rightMax})=${rightMax}, h[${right}]=${arr[right]}, 储水=${water}`, left, right, leftMax, rightMax, totalWater, waterAt:[...waterAt]});
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right--; rightMax = Math.max(rightMax, arr[right]);
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}
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}
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steps.push({stage:'done', msg:`总储水量=${totalWater}`, left, right, leftMax, rightMax, totalWater, waterAt:[...waterAt]});
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}
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function render(step) {
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const s = steps[step];
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const maxH = Math.max(...height);
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const chartH = 160; const unitH = chartH / (maxH||1); const barW = 36;
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let viz = '<div style="position:relative;display:flex;align-items:flex-end;gap:2px;height:' + (chartH+30) + 'px;padding:0 4px;margin-top:8px;">';
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height.forEach((h, i) => {
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const barH = h * unitH; const waterH = s.waterAt[i] * unitH;
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const isL = i===s.left, isR = i===s.right;
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const barBg = isL ? 'var(--blue)' : isR ? 'var(--purple)' : '#94a3b8';
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viz += `<div style="position:relative;width:${barW}px;display:flex;flex-direction:column;align-items:stretch;">`;
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if (waterH > 0) viz += `<div style="height:${waterH}px;background:rgba(59,130,246,0.25);border-radius:2px 2px 0 0;border-top:2px solid rgba(59,130,246,0.5);"></div>`;
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viz += `<div style="height:${barH}px;background:${barBg};border-radius:3px 3px 0 0;display:flex;align-items:flex-start;justify-content:center;font-size:11px;font-weight:700;color:${isL||isR?'white':'#334155'};padding-top:2px;min-height:2px;">${h>0?h:''}</div>`;
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viz += `<div style="text-align:center;font-size:10px;color:var(--text-muted);margin-top:2px;">${i}</div></div>`;
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});
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viz += '</div>';
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viz += `<div style="margin-top:10px;display:flex;gap:16px;"><span style="color:var(--blue);">■ left_max=${s.leftMax}</span><span style="color:var(--purple);">■ right_max=${s.rightMax}</span><span style="color:var(--green);">💧 储水=${s.totalWater}</span></div>`;
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$('vizArea').innerHTML = viz;
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$('detailContent').innerHTML = '<div class="calc-block">' + s.msg + '</div>';
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if (s.stage === 'done') $('resultContent').innerHTML = `<div class="final-answer">总储水量 = <b>${s.totalWater}</b></div>`;
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$('hintText').textContent = s.msg;
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const stages = ['init→初始化','calcL→左端','calcR→右端','done→完成'];
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$('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 = '[0,1,0,2,1,0,1,3,2,1,2,1]';
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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 trap(height):
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left, right = 0, len(height) - 1
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left_max, right_max = height[left], height[right]
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water = 0
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while left < right:
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if left_max <= right_max:
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water += left_max - height[left]
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left += 1
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left_max = max(left_max, height[left])
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else:
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water += right_max - height[right]
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right -= 1
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right_max = max(right_max, height[right])
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return water`, {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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