154 lines
7.2 KiB
HTML
154 lines
7.2 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>079. 跳跃游戏 II – 图解</title>
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<link rel="stylesheet" href="../shared/style.css">
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<style>.vis-area { min-height: 120px; padding: 16px 0; } .code-section { margin-top: 16px; }
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.seg{display:inline-flex;align-items:center;justify-content:center;padding:4px 2px;border-radius:6px 6px 0 0;font-size:12px;font-weight:700;color:white;transition:all .25s;min-width:36px;}
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</style>
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</head>
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<body><div class="container">
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<h1>🟡 079. 跳跃游戏 II <span class="badge medium">中等</span></h1>
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<p class="subtitle">分类：贪心 ｜ LeetCode Hot 100</p>
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<div class="controls" id="controls">
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<label>输入：</label><input type="text" id="inputArea" value="[2,3,1,1,4]">
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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"><span id="stepInfo"></span><br><span id="hintText"></span></div>
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<div class="panels">
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<div class="panel" id="mainPanel"><h3>📊 可视化</h3><div class="vis-area" id="vizArea"></div></div>
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<div class="panel-grid">
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<div class="panel" id="detailPanel"><h3>📝 当前步骤详情</h3><div id="detailContent"></div></div>
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<div class="panel" id="resultPanel"><h3>✅ 结果</h3><div id="resultContent"></div></div>
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</div>
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</div>
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<div class="panel code-section"><h3>💻 参考代码（Python）</h3><div id="codeArea"></div></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:[2,3,1,1,4], label:'示例1: [2,3,1,1,4]'},
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{input:[2,3,0,1,4], label:'示例2: [2,3,0,1,4]'},
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{input:[1,2,1,1,1], label:'示例3: [1,2,1,1,1]'},
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];
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const COLORS = ['#3b82f6','#8b5cf6','#f59e0b','#ef4444','#10b981','#06b6d4'];
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let nums, steps, stepCtrl;
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function buildSteps(arr) {
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nums = [...arr]; steps = [];
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let jumps = 0, curEnd = 0, farthest = 0;
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const segs = [];
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steps.push({stage:'init', msg:`初始化：jumps=0, 当前边界=0, 最远可达=0`, i:0, jumps, curEnd, farthest, segs:[]});
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for (let i = 0; i < arr.length - 1; i++) {
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farthest = Math.max(farthest, i + arr[i]);
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steps.push({stage:'reach', msg:`i=${i}: nums[${i}]=${arr[i]}，可达 i+${arr[i]}=${i+arr[i]}，最远可达=${farthest}`, i, jumps, curEnd, farthest, segs:JSON.parse(JSON.stringify(segs))});
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if (i === curEnd) {
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segs.push({start: jumps===0?0:segs[segs.length-1].end+1, end: i, color:COLORS[jumps%COLORS.length]});
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jumps++;
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curEnd = farthest;
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steps.push({stage:'jump', msg:`到达当前边界 i=${i}，跳跃！jumps=${jumps}，新边界=${curEnd}`, i, jumps, curEnd, farthest, segs:JSON.parse(JSON.stringify(segs))});
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}
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}
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// last segment
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if (segs.length===0 || segs[segs.length-1].end < nums.length-1) {
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segs.push({start: segs.length?segs[segs.length-1].end+1:0, end:nums.length-1, color:COLORS[jumps%COLORS.length]});
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}
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steps.push({stage:'done', msg:`完成！最少跳跃次数 = ${jumps}`, i:nums.length-1, jumps, curEnd, farthest, segs});
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}
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function render(step) {
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const s = steps[step];
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// segments visualization
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let viz = '<div style="margin-bottom:12px;">';
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// array with colored segments
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viz += '<div class="nums-line">';
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nums.forEach((v,i) => {
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const seg = s.segs.find(sg => i >= sg.start && i <= sg.end);
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let cls = 'default';
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if (s.stage !== 'init') {
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if (i === s.i) cls = 'active';
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}
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viz += `<span class="chip ${cls}" style="min-width:38px;${seg?'border-bottom:3px solid '+seg.color+';':''}">${v}</span>`;
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});
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viz += '</div>';
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// jump range bar
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if (s.segs.length > 0) {
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viz += '<div style="display:flex;height:28px;border-radius:6px;overflow:hidden;margin-top:8px;">';
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s.segs.forEach((sg,idx) => {
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const pct = ((sg.end - sg.start + 1) / nums.length * 100);
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viz += `<div class="seg" style="width:${pct}%;background:${sg.color};">第${idx+1}跳</div>`;
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});
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const covered = s.segs.reduce((a,s)=>a+s.end-s.start+1, 0);
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if (covered < nums.length) {
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viz += `<div class="seg" style="width:${(nums.length-covered)/nums.length*100}%;background:#e2e8f0;color:#94a3b8;">待跳</div>`;
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}
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viz += '</div>';
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}
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viz += '</div>';
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viz += `<div style="margin-top:8px;font-size:14px;color:#475569;">
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<b>jumps</b>=${s.jumps} <b>当前边界</b>=${s.curEnd} <b>最远可达</b>=${s.farthest}
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</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') {
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$('resultContent').innerHTML = `<div class="final-answer">最少跳跃次数 = <b>${s.jumps}</b></div>
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<div class="complexity">时间复杂度 O(n)，空间复杂度 O(1)</div>`;
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}
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$('hintText').textContent = s.msg;
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const stages = ['init→初始化','reach→可达范围','jump→跳跃','done→完成'];
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$('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}">${e.label}</option>`);
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buildSteps(examples[0].input);
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stepCtrl = new StepController({onStep:render});
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stepCtrl.setSteps(steps.map((_,i)=>i));
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$('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[+$('exampleSelect').value];
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$('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 jump(nums):
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jumps = cur_end = farthest = 0
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for i in range(len(nums) - 1):
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farthest = max(farthest, i + nums[i])
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if i == cur_end:
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jumps += 1
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cur_end = farthest
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return jumps`, {lang:'Python'});
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})();
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</script>
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</body></html>
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