[LeetCode] 852. Peak Index in a Mountain Array 山形数组的顶峰坐标
Let's call an array `A` a *mountain* if the following properties hold: A.length >= 3 There exists some 0 < i < A.length ...
原文：[LeetCode] 941. Valid Mountain Array 验证山形数组
Given an array A of integers, return true if and only if it is a valid mountain array . Recall that A is a mountain array if and only if: A.length gt There exists someiwith lt i lt A.length such that ...
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