Find the Number of Subarrays Where Boundary Elements Are Maximum
You are given an array of positive integers nums.
You are given an array of positive integers nums.
Return the number of subarrays of nums, where the first and the last elements of the subarray are equal to the largest element in the subarray.
Example 1
Input: nums = [1,4,3,3,2]
Output: 6
Explanation: There are 6 subarrays which have the first and the last elements equal to the largest element of the subarray: Hence, we return 6.
Example 2
Input: nums = [3,3,3]
Output: 6
Explanation: There are 6 subarrays which have the first and the last elements equal to the largest element of the subarray: Hence, we return 6.
Example 3
Input: nums = [1]
Output: 1
Explanation: There is a single subarray of nums which is [ 1 ] , with its largest element 1. The first element is 1 and the last element is also 1. Hence, we return 1.
Constraints
- 1 <= nums.length <= 10^5
- 1 <= nums[i] <= 10^9
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