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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>004. 移动零 – 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>🟢 004. 移动零 <span class="badge easy">简单</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: [0,1,0,3,12], label: '示例1: [0,1,0,3,12]'},
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{input: [0], label: '示例2: [0]'},
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{input: [1,0,2,0,3], label: '示例3: [1,0,2,0,3]'},
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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 = [];
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let slow = 0;
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steps.push({stage:'start', msg:'用快慢指针：slow 指向第一个可放非零元素的位置，fast 遍历数组', arr:[...nums], slow:0, fast:0});
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for (let fast = 0; fast < nums.length; fast++) {
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steps.push({stage:'check', msg:`fast=${fast}，nums[${fast}]=${nums[fast]} ${nums[fast]===0?'是零，跳过':'不是零，交换到前面'}`, arr:[...nums], slow, fast});
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if (nums[fast] !== 0) {
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if (slow !== fast) {
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[nums[slow], nums[fast]] = [nums[fast], nums[slow]];
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steps.push({stage:'swap', msg:`交换 nums[${slow}]=0 和 nums[${fast}]=${nums[slow]} → [${nums}]`, arr:[...nums], slow, fast});
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}
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slow++;
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steps.push({stage:'advance', msg:`slow 前进到 ${slow}`, arr:[...nums], slow, fast});
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}
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}
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steps.push({stage:'done', msg:`完成！所有非零元素已移到前面`, arr:[...nums], slow, fast:nums.length});
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}
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function render(step) {
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const s = steps[step];
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const hl = {};
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if (s.fast < s.arr.length) hl[s.fast] = 'orange';
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if (s.slow < s.arr.length) hl[s.slow] = 'blue';
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// mark placed non-zeros
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for (let i = 0; i < s.slow; i++) { if (s.arr[i] !== 0) hl[i] = 'green'; }
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let viz = renderArray(s.arr, {highlights: hl, pointers: {slow: s.slow, fast: s.fast}});
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$('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">结果：<b>[${s.arr}]</b></div>`;
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}
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$('hintText').textContent = s.msg;
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const stages = ['start→开始','check→检查','swap→交换','advance→前进','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 = '[0,1,0,3,12]';
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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 moveZeroes(nums):
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slow = 0
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for fast in range(len(nums)):
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if nums[fast] != 0:
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nums[slow], nums[fast] = nums[fast], nums[slow]
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slow += 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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