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"translatedContent": "符合下列属性的数组 <code>arr</code> 称为 <strong>山脉数组</strong> :\n<ul>\n\t<li><code>arr.length >= 3</code></li>\n\t<li>存在 <code>i</code>(<code>0 < i < arr.length - 1</code>)使得:\n\t<ul>\n\t\t<li><code>arr[0] < arr[1] < ... arr[i-1] < arr[i] </code></li>\n\t\t<li><code>arr[i] > arr[i+1] > ... > arr[arr.length - 1]</code></li>\n\t</ul>\n\t</li>\n</ul>\n\n<p>给你由整数组成的山脉数组 <code>arr</code> ,返回任何满足 <code>arr[0] < arr[1] < ... arr[i - 1] < arr[i] > arr[i + 1] > ... > arr[arr.length - 1]</code> 的下标 <code>i</code> 。</p>\n\n<p> </p>\n\n<p><strong>示例 1:</strong></p>\n\n<pre>\n<strong>输入:</strong>arr = [0,1,0]\n<strong>输出:</strong>1\n</pre>\n\n<p><strong>示例 2:</strong></p>\n\n<pre>\n<strong>输入:</strong>arr = [0,2,1,0]\n<strong>输出:</strong>1\n</pre>\n\n<p><strong>示例 3:</strong></p>\n\n<pre>\n<strong>输入:</strong>arr = [0,10,5,2]\n<strong>输出:</strong>1\n</pre>\n\n<p><strong>示例 4:</strong></p>\n\n<pre>\n<strong>输入:</strong>arr = [3,4,5,1]\n<strong>输出:</strong>2\n</pre>\n\n<p><strong>示例 5:</strong></p>\n\n<pre>\n<strong>输入:</strong>arr = [24,69,100,99,79,78,67,36,26,19]\n<strong>输出:</strong>2\n</pre>\n\n<p> </p>\n\n<p><strong>提示:</strong></p>\n\n<ul>\n\t<li><code>3 <= arr.length <= 10<sup>4</sup></code></li>\n\t<li><code>0 <= arr[i] <= 10<sup>6</sup></code></li>\n\t<li>题目数据保证 <code>arr</code> 是一个山脉数组</li>\n</ul>\n\n<p> </p>\n\n<p><strong>进阶:</strong>很容易想到时间复杂度 <code>O(n)</code> 的解决方案,你可以设计一个 <code>O(log(n))</code> 的解决方案吗?</p>\n",
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