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Grokking the Coding Interview Patterns in Python

Solution: Number of Valid Subarrays

Understand how to efficiently count non-empty contiguous subarrays where the first element is less than or equal to all others by applying a monotonic increasing stack algorithm. Learn the step-by-step approach with amortized time complexity analysis and practice stack usage in coding interviews.

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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:

  • 1≤1 \leq nums.length ≤1000\leq 1000

  • 0≤0 \leq nums[i] ...