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Grokking the Coding Interview Patterns

Solution: Subarray Sum Equals K

Explore how to determine the total number of contiguous subarrays whose sum equals a given value k by leveraging prefix sums and hash maps. Understand the step-by-step approach to track prefix sums' frequencies and efficiently compute valid subarrays in a single pass through the array.

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Statement

Given an array of integers nums and an integer k, determine the total number of subarrays whose sum is exactly equal to k.

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

Constraints:

  • 1≤1 \leq nums.length ≤2×104\leq 2 \times 10^4

  • −1000≤-1000 \leq ...