264 lines
10 KiB
HTML
264 lines
10 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>008. 无重复字符的最长子串 – 图解</title>
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<link rel="stylesheet" href="../shared/style.css">
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<style>
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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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.freq-table { margin-top: 12px; }
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.freq-table td, .freq-table th { font-size: 13px; padding: 4px 8px; }
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.char-in-set { background: #dcfce7 !important; color: #166534; font-weight: 700; }
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.window-info { display: flex; gap: 16px; flex-wrap: wrap; margin-top: 10px; }
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.window-stat { padding: 6px 14px; background: #f0f9ff; border-radius: 8px; font-size: 14px; }
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.window-stat b { color: var(--blue-dark); }
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.best-stat { padding: 6px 14px; background: #f0fdf4; border-radius: 8px; font-size: 14px; }
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.best-stat b { color: var(--green-dark); }
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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>🟡 008. 无重复字符的最长子串 <span class="badge medium">中等</span></h1>
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<p class="subtitle">分类：滑动窗口 ｜ LeetCode Hot 100</p>
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<div class="controls" id="controls">
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<label for="inputStr">字符串：</label>
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<input type="text" id="inputStr" value="abcabcbb" placeholder="如 abcabcbb">
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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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<div class="pipeline" id="pipeline"></div>
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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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<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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<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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const examples = [
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{input: 'abcabcbb', label: '示例1: abcabcbb → 3'},
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{input: 'bbbbb', label: '示例2: bbbbb → 1'},
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{input: 'pwwkew', label: '示例3: pwwkew → 3'},
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{input: 'abcdefgh', label: '示例4: abcdefgh → 8 (无重复)'},
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];
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let steps, stepCtrl, inputStr;
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function buildSteps(s) {
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inputStr = s;
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steps = [];
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const n = s.length;
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if (n === 0) {
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steps.push({stage:'done', left:0, right:-1, charSet:{}, maxLen:0, maxStart:0, msg:'字符串为空，返回 0'});
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return;
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}
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const charSet = {};
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let left = 0, maxLen = 0, maxStart = 0;
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steps.push({stage:'init', left:0, right:-1, charSet:{}, maxLen:0, maxStart:0, msg:'初始化：left = 0, 空字符集, maxLen = 0'});
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for (let right = 0; right < n; right++) {
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const ch = s[right];
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if (charSet[ch] !== undefined) {
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steps.push({
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stage:'repeat', left, right, charSet: {...charSet},
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maxLen, maxStart, dupChar:ch, msg:`右指针 → ${right}，s[${right}] = '${ch}'，字符集中已存在 '${ch}'，需收缩左边界`
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});
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while (charSet[ch] !== undefined) {
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const rem = s[left];
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delete charSet[rem];
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const still = charSet[ch] !== undefined;
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steps.push({
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stage:'shrink', left:left+1, right, charSet:{...charSet},
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maxLen, maxStart, removed:rem, msg:`移除 s[${left}] = '${rem}'，left → ${left+1}${still ? '，仍有重复，继续收缩' : '，重复已消除'}`
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});
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left++;
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}
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charSet[ch] = right;
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steps.push({
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stage:'add', left, right, charSet:{...charSet},
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maxLen, maxStart, added:ch, msg:`将 '${ch}' 加入字符集，窗口 [${left}, ${right}]`
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});
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} else {
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charSet[ch] = right;
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steps.push({
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stage:'expand', left, right, charSet:{...charSet},
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maxLen, maxStart, added:ch, msg:`右指针 → ${right}，s[${right}] = '${ch}'，不在字符集中，加入，窗口 [${left}, ${right}]`
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});
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}
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const curLen = right - left + 1;
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if (curLen > maxLen) {
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maxLen = curLen;
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maxStart = left;
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steps.push({
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stage:'update', left, right, charSet:{...charSet},
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maxLen, maxStart, msg:`窗口长度 ${curLen} > maxLen，更新 maxLen = ${maxLen}，起始于 ${maxStart}`
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});
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}
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}
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steps.push({
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stage:'done', left, right:n-1, charSet:{...charSet},
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maxLen, maxStart, msg:`遍历完毕，最长不含重复字符的子串长度 = ${maxLen}`
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});
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}
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function render(stepIdx) {
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const s = steps[stepIdx];
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const arr = inputStr.split('');
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const hl = {};
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// highlight current window
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if (s.right >= 0) {
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for (let i = s.left; i <= Math.min(s.right, arr.length-1); i++) {
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if (s.stage === 'update' || s.stage === 'done') {
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hl[i] = (i >= s.maxStart && i < s.maxStart + s.maxLen) ? 'selected' : 'blue';
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} else {
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hl[i] = 'blue';
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}
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}
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}
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// mark duplicate / newly added
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if (s.dupChar && s.right >= 0) {
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for (let i = s.left; i <= s.right; i++) {
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if (arr[i] === s.dupChar && i < s.right) hl[i] = 'red';
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}
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if (s.right < arr.length) hl[s.right] = 'red';
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} else if (s.stage === 'expand' && s.right >= 0) {
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hl[s.right] = 'green';
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} else if (s.stage === 'add' && s.right >= 0) {
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hl[s.right] = 'green';
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}
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const pointers = {};
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if (s.left >= 0 && s.left < arr.length) pointers['L'] = s.left;
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if (s.right >= 0 && s.right < arr.length) pointers['R'] = s.right;
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let viz = '<div style="margin-bottom:6px;font-size:13px;color:#475569;">原字符串：</div>';
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viz += renderArray(arr, {highlights:hl, pointers, width:42});
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const curLen = s.right >= s.left ? s.right - s.left + 1 : 0;
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viz += '<div class="window-info">';
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viz += `<div class="window-stat">窗口: [<b>${s.left}</b>, <b>${s.right >= 0 ? s.right : '?'}</b>] 长度 = <b>${curLen}</b></div>`;
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viz += `<div class="best-stat">maxLen = <b>${s.maxLen}</b>${s.maxLen > 0 ? `，起始 ${s.maxStart}` : ''}</div>`;
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viz += '</div>';
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// Character set table
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const uniqueChars = [...new Set(arr)].sort();
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if (uniqueChars.length > 0) {
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viz += '<div class="freq-table"><table><tr><th>字符</th>';
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uniqueChars.forEach(c => viz += `<th>'${c}'</th>`);
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viz += '</tr><tr><td style="font-weight:600;">在窗口中</td>';
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uniqueChars.forEach(c => {
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const inSet = s.charSet[c] !== undefined;
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viz += `<td class="${inSet ? 'char-in-set' : ''}">${inSet ? '✓' : '—'}</td>`;
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});
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viz += '</tr></table></div>';
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}
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$('vizArea').innerHTML = viz;
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let detail = '<div class="calc-block">' + s.msg + '</div>';
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const keys = Object.keys(s.charSet);
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if (keys.length > 0) {
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detail += '<div style="margin-top:6px;font-size:14px;">字符集: <code>{' + keys.sort().map(c => `'${c}'`).join(', ') + '}</code></div>';
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} else {
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detail += '<div style="margin-top:6px;font-size:14px;">字符集: <code>{空}</code></div>';
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}
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$('detailContent').innerHTML = detail;
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if (s.stage === 'done') {
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const bestStr = inputStr.substring(s.maxStart, s.maxStart + s.maxLen);
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$('resultContent').innerHTML = `<div class="final-answer">最长不含重复字符的子串长度 = <b>${s.maxLen}</b><br>子串: <code>"${bestStr}"</code>（位置 ${s.maxStart} ~ ${s.maxStart + s.maxLen - 1}）</div>`;
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}
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$('hintText').textContent = s.msg;
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const pipeStages = [
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{k:'init',l:'初始化'},{k:'expand',l:'右扩'},{k:'repeat',l:'发现重复'},
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{k:'shrink',l:'左缩'},{k:'add',l:'加入'},{k:'update',l:'更新最大'},{k:'done',l:'完成'}
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];
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$('pipeline').innerHTML = pipeStages.map(p =>
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`<span class="pipe-step ${s.stage===p.k?'active':''}">${p.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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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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stepCtrl.onStep = (idx) => { render(idx); $('stepInfo').textContent = `步骤 ${idx+1} / ${steps.length}`; };
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$('stepInfo').textContent = '步骤 1 / ' + steps.length;
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$('applyBtn').onclick = () => {
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const v = $('inputStr').value.trim();
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if (!v) { alert('请输入字符串'); return; }
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buildSteps(v); stepCtrl.setSteps(steps.map((_,i)=>i)); render(0);
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$('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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$('inputStr').value = e.input;
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buildSteps(e.input); stepCtrl.setSteps(steps.map((_,i)=>i)); render(0);
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};
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$('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 lengthOfLongestSubstring(s: str) -> int:
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char_set = set()
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left = 0
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max_len = 0
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for right in range(len(s)):
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while s[right] in char_set:
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char_set.remove(s[left])
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left += 1
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char_set.add(s[right])
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max_len = max(max_len, right - left + 1)
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return max_len`, {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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