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Grokking the Coding Interview Patterns in Go

Solution: Count Subarrays With Fixed Bounds

Explore how to solve the problem of counting fixed-bound subarrays in an array using a two-pointer technique. Understand tracking positions of minK, maxK, and invalid elements to compute valid subarrays efficiently in a single pass. This lesson strengthens your skills in array traversal and problem-solving with optimal time and space complexity.

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Statement

Given an integer array, nums, and two integers minK and maxK, return the number of fixed-bound subarrays.

A subarray in nums is called a fixed-bound subarray if it satisfies the following conditions:

  1. The smallest value in the subarray equals minK.

  2. The largest value in the subarray equals maxK.

Note: A subarray is a contiguous sequence of elements within an array.

Constraints:

  • 2 ...