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Grokking the Coding Interview Patterns in Python

Solution: Subarray Sum Equals K

Understand how to determine the total number of subarrays whose sum equals a target value k by using prefix sums and a hash map to track frequencies. This lesson guides you through applying this strategy in linear time with efficient use of data structures.

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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 ...