1063. Number of Valid Subarrays

Given an array A of integers, return the number of non-empty continuous subarrays that satisfy the following condition:

The leftmost element of the subarray is not larger than other elements in the subarray.

 

Example 1:

Input: 

[1,4,2,5,3]

Output: 

11

Explanation: 

There are 11 valid subarrays: [1],[4],[2],[5],[3],[1,4],[2,5],[1,4,2],[2,5,3],[1,4,2,5],[1,4,2,5,3].

Example 2:

Input: 

[3,2,1]

Output: 

3

Explanation: 

The 3 valid subarrays are: [3],[2],[1].

Example 3:

Input: 

[2,2,2]

Output: 

6

Explanation: 

There are 6 valid subarrays: [2],[2],[2],[2,2],[2,2],[2,2,2].

 

Note:

1. 1 <= A.length <= 50000
2. 0 <= A[i] <= 100000