leetcode-problemset/leetcode-cn/originData/peak-index-in-a-mountain-array.json

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        "question": {
            "questionId": "882",
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            "categoryTitle": "Algorithms",
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            "title": "Peak Index in a Mountain Array",
            "titleSlug": "peak-index-in-a-mountain-array",
            "content": "<p>Let&#39;s call an array <code>arr</code> a <strong>mountain</strong>&nbsp;if the following properties hold:</p>\n\n<ul>\n\t<li><code>arr.length &gt;= 3</code></li>\n\t<li>There exists some <code>i</code> with&nbsp;<code>0 &lt; i&nbsp;&lt; arr.length - 1</code>&nbsp;such that:\n\t<ul>\n\t\t<li><code>arr[0] &lt; arr[1] &lt; ... arr[i-1] &lt; arr[i] </code></li>\n\t\t<li><code>arr[i] &gt; arr[i+1] &gt; ... &gt; arr[arr.length - 1]</code></li>\n\t</ul>\n\t</li>\n</ul>\n\n<p>Given an integer array <code>arr</code> that is <strong>guaranteed</strong> to be&nbsp;a mountain, return any&nbsp;<code>i</code>&nbsp;such that&nbsp;<code>arr[0] &lt; arr[1] &lt; ... arr[i - 1] &lt; arr[i] &gt; arr[i + 1] &gt; ... &gt; arr[arr.length - 1]</code>.</p>\n\n<p>&nbsp;</p>\n<p><strong>Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> arr = [0,1,0]\n<strong>Output:</strong> 1\n</pre>\n\n<p><strong>Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> arr = [0,2,1,0]\n<strong>Output:</strong> 1\n</pre>\n\n<p><strong>Example 3:</strong></p>\n\n<pre>\n<strong>Input:</strong> arr = [0,10,5,2]\n<strong>Output:</strong> 1\n</pre>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>3 &lt;= arr.length &lt;= 10<sup>4</sup></code></li>\n\t<li><code>0 &lt;= arr[i] &lt;= 10<sup>6</sup></code></li>\n\t<li><code>arr</code> is <strong>guaranteed</strong> to be a mountain array.</li>\n</ul>\n\n<p>&nbsp;</p>\n<strong>Follow up:</strong> Finding the <code>O(n)</code> is straightforward, could you find an <code>O(log(n))</code> solution?",
            "translatedTitle": "山脉数组的峰顶索引",
            "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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