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| 1 | +<!DOCTYPE html> |
| 2 | +<html lang="zh"> |
| 3 | +<head> |
| 4 | + <meta charset="UTF-8" /> |
| 5 | + <title>🔍 搜索插入位置可视化</title> |
| 6 | + <style> |
| 7 | + body { |
| 8 | + font-family: "Helvetica Neue", sans-serif; |
| 9 | + background-color: #f2f4f8; |
| 10 | + margin: 0; |
| 11 | + padding: 20px; |
| 12 | + } |
| 13 | + |
| 14 | + h1 { |
| 15 | + text-align: center; |
| 16 | + color: #333; |
| 17 | + } |
| 18 | + |
| 19 | + .container { |
| 20 | + max-width: 800px; |
| 21 | + margin: auto; |
| 22 | + background: #fff; |
| 23 | + padding: 20px; |
| 24 | + border-radius: 10px; |
| 25 | + box-shadow: 0 2px 10px rgba(0,0,0,0.1); |
| 26 | + } |
| 27 | + |
| 28 | + label { |
| 29 | + display: block; |
| 30 | + margin: 10px 0 5px; |
| 31 | + font-weight: bold; |
| 32 | + } |
| 33 | + |
| 34 | + input[type="text"], input[type="number"] { |
| 35 | + width: 100%; |
| 36 | + padding: 10px; |
| 37 | + font-size: 16px; |
| 38 | + margin-bottom: 15px; |
| 39 | + border: 1px solid #ccc; |
| 40 | + border-radius: 5px; |
| 41 | + } |
| 42 | + |
| 43 | + button { |
| 44 | + padding: 10px 20px; |
| 45 | + font-size: 16px; |
| 46 | + margin-top: 10px; |
| 47 | + border: none; |
| 48 | + background-color: #007bff; |
| 49 | + color: white; |
| 50 | + border-radius: 5px; |
| 51 | + cursor: pointer; |
| 52 | + } |
| 53 | + |
| 54 | + button:hover { |
| 55 | + background-color: #0056b3; |
| 56 | + } |
| 57 | + |
| 58 | + .array-box { |
| 59 | + display: flex; |
| 60 | + justify-content: center; |
| 61 | + flex-wrap: wrap; |
| 62 | + margin-top: 20px; |
| 63 | + } |
| 64 | + |
| 65 | + .array-item { |
| 66 | + width: 40px; |
| 67 | + height: 40px; |
| 68 | + margin: 5px; |
| 69 | + text-align: center; |
| 70 | + line-height: 40px; |
| 71 | + border-radius: 5px; |
| 72 | + background-color: #e0e0e0; |
| 73 | + font-weight: bold; |
| 74 | + } |
| 75 | + |
| 76 | + .left { |
| 77 | + background-color: #ffcc80 !important; |
| 78 | + } |
| 79 | + |
| 80 | + .mid { |
| 81 | + background-color: #90caf9 !important; |
| 82 | + } |
| 83 | + |
| 84 | + .right { |
| 85 | + background-color: #a5d6a7 !important; |
| 86 | + } |
| 87 | + |
| 88 | + .result { |
| 89 | + margin-top: 20px; |
| 90 | + font-size: 18px; |
| 91 | + font-weight: bold; |
| 92 | + text-align: center; |
| 93 | + } |
| 94 | + |
| 95 | + .nav { |
| 96 | + text-align: center; |
| 97 | + margin-top: 30px; |
| 98 | + } |
| 99 | + |
| 100 | + .nav a { |
| 101 | + text-decoration: none; |
| 102 | + color: #007bff; |
| 103 | + font-size: 16px; |
| 104 | + } |
| 105 | + |
| 106 | + .nav a:hover { |
| 107 | + text-decoration: underline; |
| 108 | + } |
| 109 | + |
| 110 | + .step { |
| 111 | + font-family: monospace; |
| 112 | + background: #f7f7f7; |
| 113 | + padding: 10px; |
| 114 | + margin-top: 10px; |
| 115 | + border-radius: 5px; |
| 116 | + overflow-x: auto; |
| 117 | + } |
| 118 | + </style> |
| 119 | +</head> |
| 120 | +<body> |
| 121 | + <div class="container"> |
| 122 | + <h1>🔍 搜索插入位置(二分查找可视化)</h1> |
| 123 | + |
| 124 | + <label for="arrayInput">输入有序数组(用逗号分隔):</label> |
| 125 | + <input type="text" id="arrayInput" value="1,3,5,6" /> |
| 126 | + |
| 127 | + <label for="targetInput">目标值:</label> |
| 128 | + <input type="number" id="targetInput" value="5" /> |
| 129 | + |
| 130 | + <button onclick="startVisualization()">开始查找</button> |
| 131 | + |
| 132 | + <div class="array-box" id="arrayDisplay"></div> |
| 133 | + <div class="result" id="resultText"></div> |
| 134 | + <div class="step" id="log"></div> |
| 135 | + |
| 136 | + <div class="nav"> |
| 137 | + <a href="index.html">← 返回首页</a> |
| 138 | + </div> |
| 139 | + </div> |
| 140 | + |
| 141 | + <script> |
| 142 | + function sleep(ms) { |
| 143 | + return new Promise(resolve => setTimeout(resolve, ms)); |
| 144 | + } |
| 145 | + |
| 146 | + async function startVisualization() { |
| 147 | + const input = document.getElementById("arrayInput").value; |
| 148 | + const target = parseInt(document.getElementById("targetInput").value); |
| 149 | + const arr = input.split(",").map(s => parseInt(s.trim())).filter(n => !isNaN(n)); |
| 150 | + const log = document.getElementById("log"); |
| 151 | + log.innerText = ""; |
| 152 | + |
| 153 | + if (arr.length === 0 || isNaN(target)) { |
| 154 | + alert("请正确输入数组和目标值!"); |
| 155 | + return; |
| 156 | + } |
| 157 | + |
| 158 | + const arrayDisplay = document.getElementById("arrayDisplay"); |
| 159 | + const resultText = document.getElementById("resultText"); |
| 160 | + arrayDisplay.innerHTML = ""; |
| 161 | + resultText.innerText = ""; |
| 162 | + |
| 163 | + let left = 0, right = arr.length - 1; |
| 164 | + |
| 165 | + while (left <= right) { |
| 166 | + renderArray(arr, left, right, Math.floor((left + right) / 2)); |
| 167 | + const mid = Math.floor((left + right) / 2); |
| 168 | + log.innerText += `left=${left}, mid=${mid}, right=${right}, value=${arr[mid]}\n`; |
| 169 | + |
| 170 | + await sleep(1000); |
| 171 | + |
| 172 | + if (arr[mid] === target) { |
| 173 | + resultText.innerText = `🎯 找到目标值,索引为 ${mid}`; |
| 174 | + return; |
| 175 | + } else if (arr[mid] < target) { |
| 176 | + left = mid + 1; |
| 177 | + } else { |
| 178 | + right = mid - 1; |
| 179 | + } |
| 180 | + } |
| 181 | + |
| 182 | + renderArray(arr, left, -1, -1); |
| 183 | + resultText.innerText = `➕ 未找到目标值,应插入索引为 ${left}`; |
| 184 | + } |
| 185 | + |
| 186 | + function renderArray(arr, left, right, mid) { |
| 187 | + const display = document.getElementById("arrayDisplay"); |
| 188 | + display.innerHTML = ""; |
| 189 | + |
| 190 | + arr.forEach((val, idx) => { |
| 191 | + const div = document.createElement("div"); |
| 192 | + div.className = "array-item"; |
| 193 | + if (idx === mid) div.classList.add("mid"); |
| 194 | + if (idx === left) div.classList.add("left"); |
| 195 | + if (idx === right) div.classList.add("right"); |
| 196 | + div.innerText = val; |
| 197 | + display.appendChild(div); |
| 198 | + }); |
| 199 | + } |
| 200 | + </script> |
| 201 | +</body> |
| 202 | +</html> |
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