941. Valid Mountain Array LeetCode Solution | Easy Approach

Minimum Cost to Merge Stones
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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.

Recall that arr is a mountain array if and only if:

  • arr.length >= 3
  • There exists some i with 0 < 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

Valid Mountain Array Solutions

Time: O(n)
Space: O(n)

C++

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Java

 
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