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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>085. 零钱兑换 – 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>🟡 085. 零钱兑换 <span class="badge medium">中等</span></h1>
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<p class="subtitle">分类：动态规划 ｜ 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: [1,2,5], amount: 11, label: '示例1: coins=[1,2,5], amount=11'},
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{input: [2], amount: 3, label: '示例2: coins=[2], amount=3'},
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{input: [1], amount: 0, label: '示例3: coins=[1], amount=0'},
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];
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let coins, amount, steps, stepCtrl;
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function buildSteps(c, amt) {
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coins = [...c]; amount = amt; steps = [];
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const dp = new Array(amt + 1).fill(Infinity);
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dp[0] = 0;
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steps.push({stage:'init', msg:'初始化 dp[0]=0，其余为 ∞', dp:[...dp], current:-1, bestCoin:-1, candidates:[]});
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for (let i = 1; i <= amt; i++) {
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let bestCoin = -1, bestVal = Infinity;
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const candidates = [];
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for (const coin of coins) {
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if (coin <= i) {
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const val = dp[i - coin] + 1;
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candidates.push({coin, prev: i - coin, val});
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if (val < bestVal) { bestVal = val; bestCoin = coin; }
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}
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}
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steps.push({stage:'try', msg:`计算 dp[${i}]：尝试所有硬币`, dp:[...dp], current:i, bestCoin:-1, candidates});
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dp[i] = bestVal;
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if (bestCoin > 0) {
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steps.push({stage:'fill', msg:`dp[${i}] = dp[${i-bestCoin}]+1 = ${dp[i-bestCoin]}+1 = ${bestVal}（选硬币 ${bestCoin}）`, dp:[...dp], current:i, bestCoin, candidates});
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} else {
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steps.push({stage:'fill', msg:`dp[${i}] = ∞（无法凑出）`, dp:[...dp], current:i, bestCoin:-1, candidates});
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}
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}
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steps.push({stage:'done', msg:dp[amt]===Infinity?`无法凑出金额 ${amt}`:`凑出金额 ${amt} 最少需要 ${dp[amt]} 枚硬币`, dp:[...dp], current:amt, bestCoin:-1, candidates:[]});
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}
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function render(step) {
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const s = steps[step];
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let viz = '<div style="margin-top:8px;"><b>金额轴 & dp 表：</b></div>';
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viz += '<div style="display:flex;flex-wrap:wrap;gap:4px;margin:8px 0;">';
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for (let i = 0; i <= amount; i++) {
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const cls = i === s.current ? (s.stage==='try'?'orange':'green') : 'default';
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const val = s.dp[i] === Infinity ? '∞' : s.dp[i];
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viz += `<span class="chip-group"><span class="chip ${cls}" style="min-width:36px;font-size:13px;">${val}</span><span class="chip-index">${i}</span></span>`;
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}
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viz += '</div>';
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viz += '<div style="margin-top:8px;"><b>硬币面额：</b></div>';
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viz += '<div style="display:flex;gap:6px;margin:4px 0;">';
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coins.forEach(c => {
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const isBest = c === s.bestCoin;
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const cls = isBest ? 'green' : 'default';
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viz += `<span class="chip ${cls}" style="border-radius:50%;min-width:36px;height:36px;">${c}</span>`;
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});
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viz += '</div>';
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if (s.candidates && s.candidates.length > 0) {
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viz += '<div style="margin-top:8px;"><b>候选：</b></div>';
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viz += '<div style="display:flex;gap:6px;flex-wrap:wrap;margin:4px 0;">';
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s.candidates.forEach(c => {
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const isBest = c.coin === s.bestCoin;
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const bg = isBest ? '#dcfce7' : '#f0f9ff';
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const bd = isBest ? '2px solid #16a34a' : '1px solid #cbd5e1';
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viz += `<span style="padding:4px 10px;background:${bg};border:${bd};border-radius:8px;font-size:13px;">用${c.coin} → dp[${c.prev}]+1=${c.val===Infinity?'∞':c.val}</span>`;
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});
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viz += '</div>';
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}
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$('vizArea').innerHTML = viz;
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$('detailContent').innerHTML = '<div class="calc-block">' + s.msg + '</div>';
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if (s.current >= 0 && s.dp[s.current] !== Infinity) {
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$('detailContent').innerHTML += `<div class="current-answer">dp[${s.current}] = <b>${s.dp[s.current]}</b></div>`;
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}
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if (s.stage === 'done') {
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if (s.dp[amount] === Infinity) {
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$('resultContent').innerHTML = '<div class="final-answer" style="border-color:#f87171;background:#fef2f2;">无法凑出该金额，返回 <b>-1</b></div>';
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} else {
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$('resultContent').innerHTML = `<div class="final-answer">最少需要 <b>${s.dp[amount]}</b> 枚硬币</div>`;
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}
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}
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$('hintText').textContent = s.msg;
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const stages = ['init→初始化','try→尝试','fill→填充','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 = 'coins=[1,2,5], amount=11';
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buildSteps(examples[0].input, examples[0].amount);
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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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const m = $('inputArea').value.match(/coins=\[([^\]]+)\].*amount=(\d+)/);
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if (!m) { alert('格式: coins=[1,2,5], amount=11'); return; }
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const c = m[1].split(',').map(Number);
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buildSteps(c, parseInt(m[2]));
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stepCtrl.setSteps(steps.map((_,i)=>i)); render(0); $('stepInfo').textContent = '步骤 1 / ' + steps.length;
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};
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$('exampleSelect').onchange = () => {
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const e = examples[parseInt($('exampleSelect').value)];
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$('inputArea').value = `coins=[${e.input}], amount=${e.amount}`;
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buildSteps(e.input, e.amount); 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(
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`def coinChange(coins, amount):\n` +
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` dp = [float('inf')] * (amount + 1)\n` +
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` dp[0] = 0\n` +
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` for i in range(1, amount + 1):\n` +
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` for coin in coins:\n` +
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` if coin <= i:\n` +
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` dp[i] = min(dp[i], dp[i - coin] + 1)\n` +
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` return dp[amount] if dp[amount] != float('inf') else -1`,
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{lang:'Python'}
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);
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})();
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</script>
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</body>
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</html>
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