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Solution: Number of Valid Subarrays

Explore how to efficiently count all valid contiguous subarrays in an integer array where the first element is less than or equal to others by using a monotonic increasing stack. Understand the algorithm steps, including stack operations and amortized time complexity, to solve this problem in linear time.

Statement

Given an integer array nums, count how many non-empty contiguous subarrays exist where the first element of each subarray is less than or equal to every other element within that subarray.

Note: A subarray is defined as a contiguous portion of an array.

Constraints:

  • 11 \leq nums.length 1000\leq 1000 ...