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"translatedContent": "<p>把符合下列属性的数组 <code>arr</code> 称为 <strong>山脉数组</strong> :</p>\n\n<ul>\n\t<li><code>arr.length >= 3</code></li>\n\t<li>存在下标 <code>i</code>(<code>0 < i < arr.length - 1</code>),满足\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>给出一个整数数组 <code>arr</code>,返回最长山脉子数组的长度。如果不存在山脉子数组,返回 <code>0</code> 。</p>\n\n<p> </p>\n\n<p><strong>示例 1:</strong></p>\n\n<pre>\n<strong>输入:</strong>arr = [2,1,4,7,3,2,5]\n<strong>输出:</strong>5\n<strong>解释:</strong>最长的山脉子数组是 [1,4,7,3,2],长度为 5。\n</pre>\n\n<p><strong>示例 2:</strong></p>\n\n<pre>\n<strong>输入:</strong>arr = [2,2,2]\n<strong>输出:</strong>0\n<strong>解释:</strong>不存在山脉子数组。\n</pre>\n\n<p> </p>\n\n<p><strong>提示:</strong></p>\n\n<ul>\n\t<li><code>1 <= arr.length <= 10<sup>4</sup></code></li>\n\t<li><code>0 <= arr[i] <= 10<sup>4</sup></code></li>\n</ul>\n\n<p> </p>\n\n<p><strong>进阶:</strong></p>\n\n<ul>\n\t<li>你可以仅用一趟扫描解决此问题吗?</li>\n\t<li>你可以用 <code>O(1)</code> 空间解决此问题吗?</li>\n</ul>\n",
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