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Leetcode 560. Subarray Sum Equals K

Count the number of contiguous, non-empty subarrays whose elements sum to k. Because nums can include negatives (so two-pointer sliding window doesn't work), use cumulative prefix sums with a hash map of frequencies to count matching previous sums in O(n) time.

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Late September, 2025

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Early August, 2025

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Senior

Negative numbers OK, only need to return true if subarray sum exists else false

Mid July, 2025

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Leetcode 560. Subarray Sum Equals K

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