0941. Valid Mountain Array
https://leetcode.com/problems/valid-mountain-array
Description
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:
arr.length >= 3
There exists some
i
with0 < i < arr.length - 1
such that:arr[0] < arr[1] < ... < arr[i - 1] < arr[i]
arr[i] > arr[i + 1] > ... > arr[arr.length - 1]
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 <= 104
0 <= arr[i] <= 104
ac
Last updated
Was this helpful?