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Valid Mountain Array
Given an array of integers arr, return true if and only if it is a valid mountain array.
Given an array of integers arr, return true if and only if it is a valid mountain array.
Recall that arr is a mountain array if and only if:
Example 1
Input: arr = [2,1]
Output: false
Example 2
Input: arr = [3,5,5]
Output: false
Example 3
Input: arr = [0,3,2,1]
Output: true
Constraints
- 1 <= arr.length <= 10^4
- 0 <= arr[i] <= 10^4
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