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Grokking the Coding Interview Patterns in C#

Solution: Number of Valid Subarrays

Explore how to implement a stack-based algorithm that counts all non-empty contiguous subarrays where the first element is the smallest within that subarray. Understand the use of a monotonic increasing stack, amortized time complexity, and memory management to solve this problem efficiently in C#.

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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] ...