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

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            "title": "Peak Index in a Mountain Array",
            "titleSlug": "peak-index-in-a-mountain-array",
            "content": "<p>You are given an integer <strong>mountain</strong> array <code>arr</code> of length <code>n</code> where the values increase to a <strong>peak element</strong> and then decrease.</p>\n\n<p>Return the index of the peak element.</p>\n\n<p>Your task is to solve it in <code>O(log(n))</code> time complexity.</p>\n\n<p>&nbsp;</p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<div class=\"example-block\">\n<p><strong>Input:</strong> <span class=\"example-io\">arr = [0,1,0]</span></p>\n\n<p><strong>Output:</strong> <span class=\"example-io\">1</span></p>\n</div>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<div class=\"example-block\">\n<p><strong>Input:</strong> <span class=\"example-io\">arr = [0,2,1,0]</span></p>\n\n<p><strong>Output:</strong> <span class=\"example-io\">1</span></p>\n</div>\n\n<p><strong class=\"example\">Example 3:</strong></p>\n\n<div class=\"example-block\">\n<p><strong>Input:</strong> <span class=\"example-io\">arr = [0,10,5,2]</span></p>\n\n<p><strong>Output:</strong> <span class=\"example-io\">1</span></p>\n</div>\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>5</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",
            "translatedTitle": "山脉数组的峰顶索引",
            "translatedContent": "<p>给定一个长度为&nbsp;<code>n</code>&nbsp;的整数 <strong>山脉&nbsp;</strong>数组&nbsp;<code>arr</code>&nbsp;，其中的值递增到一个&nbsp;<strong>峰值元素</strong>&nbsp;然后递减。</p>\n\n<p>返回峰值元素的下标。</p>\n\n<p>你必须设计并实现时间复杂度为 <code>O(log(n))</code> 的解决方案。</p>\n\n<p>&nbsp;</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>&nbsp;</p>\n\n<p><strong>提示：</strong></p>\n\n<ul>\n\t<li><code>3 &lt;= arr.length &lt;= 10<sup>5</sup></code></li>\n\t<li><code>0 &lt;= arr[i] &lt;= 10<sup>6</sup></code></li>\n\t<li>题目数据 <strong>保证</strong> <code>arr</code> 是一个山脉数组</li>\n</ul>\n",
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