Web Reference: Given an array of integers nums and an integer k, return the total number of subarrays whose sum equals to k. A subarray is a contiguous non-empty sequence of elements within an array. Jul 28, 2025 · To count subarrays with sum k, we use a hash map to store the frequency of prefix sums. At each index, we calculate the current prefix sum currSum and check if (currSum - k) exists in the map. The simplest approach is to consider every possible subarray and check if its sum equals k. For each starting index, we extend the subarray element by element, maintaining a running sum.
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