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Solution: Subarray Sum Equals K

Explore how to solve the problem of counting subarrays whose sums equal a target k by leveraging prefix sums and a hash map. This lesson helps you understand the algorithmic approach behind mapping prefix sum frequencies, enabling an efficient single-pass solution with attention to time and space complexity.

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:

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

  • 1000-1000 \leq ...