136 lines
6.3 KiB
HTML
136 lines
6.3 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>099. 下一个排列 – 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>🟡 099. 下一个排列 <span class="badge medium">中等</span></h1>
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<p class="subtitle">分类：技巧 ｜ 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:[1,2,3], label:'示例1: [1,2,3]'},
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{input:[3,2,1], label:'示例2: [3,2,1]'},
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{input:[1,1,5], label:'示例3: [1,1,5]'},
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{input:[1,3,2], label:'示例4: [1,3,2]'},
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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];steps=[];const n=nums.length;
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steps.push({stage:'init',msg:'①找下降点 ②找交换目标 ③反转后缀',arr:[...nums],phase:0,i:-1,j:-1});
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let i=n-2;while(i>=0&&nums[i]>=nums[i+1])i--;
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if(i<0){steps.push({stage:'no_desc',msg:'降序=最大排列，直接反转',arr:[...nums],phase:1,i:-1,j:-1});}
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else{steps.push({stage:'found_desc',msg:`下降点: nums[${i}]=${nums[i]} < nums[${i+1}]=${nums[i+1]}`,arr:[...nums],phase:1,i,j:-1});
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let j=n-1;while(nums[j]<=nums[i])j--;steps.push({stage:'found_swap',msg:`交换目标: nums[${j}]=${nums[j]}`,arr:[...nums],phase:2,i,j});
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[nums[i],nums[j]]=[nums[j],nums[i]];steps.push({stage:'swap',msg:`交换→[${nums}]`,arr:[...nums],phase:2,i,j});}
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let left=i+1,right=n-1;while(left<right){[nums[left],nums[right]]=[nums[right],nums[left]];steps.push({stage:'reverse',msg:`反转: swap[${left}],[${right}]→[${nums}]`,arr:[...nums],phase:3,i,j:left,k:right});left++;right--;}
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steps.push({stage:'done',msg:`下一个排列[${nums}]`,arr:[...nums],phase:4,i:-1,j:-1});
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}
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function render(step) {
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const s=steps[step];const hl={};
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if(s.i>=0)hl[s.i]='orange';if(s.j>=0&&s.stage!=='reverse')hl[s.j]='purple';
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if(s.stage==='reverse'){if(s.j>=0)hl[s.j]='blue';if(s.k>=0)hl[s.k]='blue';}
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if(s.stage==='done'||s.stage==='reverse'){const ds=s.i>=0?s.i+1:0;for(let k=ds;k<s.arr.length;k++)if(!hl[k])hl[k]='green';}
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let viz=renderArray(s.arr,{highlights:hl});
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const phases=['①找下降点','②找交换','③反转','③反转','✅完成'];
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viz+=`<div style="margin-top:10px;"><b>阶段：</b>${phases[Math.min(s.phase,4)]}</div>`;
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$('vizArea').innerHTML=viz;$('detailContent').innerHTML='<div class="calc-block">'+s.msg+'</div>';
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if(s.stage==='done') $('resultContent').innerHTML=`<div class="final-answer">下一个排列=<b>[${s.arr}]</b></div>`;
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$('hintText').textContent=s.msg;
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const stages=['init→初始化','found_desc→下降点','found_swap→目标','swap→交换','reverse→反转','no_desc→无下降','done→完成'];
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$('pipeline').innerHTML=stages.map(x=>{const[k,l]=x.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=$('exampleSelect');examples.forEach((e,i)=>{sel.innerHTML+=`<option value="${i}">${e.label}</option>`;});
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$('inputArea').value='[1,2,3]';buildSteps(examples[0].input);
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stepCtrl=new StepController({onStep:render});stepCtrl.setSteps(steps.map((_,i)=>i));
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$('stepInfo').textContent='步骤 1 / '+steps.length;stepCtrl.onStep=(idx)=>{render(idx);$('stepInfo').textContent=`步骤 ${idx+1} / ${steps.length}`;};
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$('applyBtn').onclick=()=>{try{const a=JSON.parse($('inputArea').value);buildSteps(a);stepCtrl.setSteps(steps.map((_,i)=>i));render(0);}catch(e){alert('请输入合法JSON数组');}};
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$('exampleSelect').onchange=()=>{const e=examples[parseInt($('exampleSelect').value)];$('inputArea').value=JSON.stringify(e.input);buildSteps(e.input);stepCtrl.setSteps(steps.map((_,i)=>i));render(0);};
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$('prevBtn').onclick=()=>stepCtrl.prev();$('nextBtn').onclick=()=>stepCtrl.next();$('jumpBtn').onclick=()=>stepCtrl.jumpToEnd();
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$('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 nextPermutation(nums):
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i = len(nums) - 2
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while i >= 0 and nums[i] >= nums[i+1]:
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i -= 1
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if i >= 0:
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j = len(nums) - 1
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while nums[j] <= nums[i]:
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j -= 1
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nums[i], nums[j] = nums[j], nums[i]
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left, right = i + 1, len(nums) - 1
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while left < right:
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nums[left], nums[right] = nums[right], nums[left]
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left += 1; right -= 1`, {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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