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Problems > Subarrays with Sum in a Band > Editorial

Subarrays with Sum in a Band — Solution & Editorial

Back to the Problem

'Sum in [LO, HI]' = (subarrays with sum ≤ HI) − (sum ≤ LO−1); each is a sliding window counting valid left endpoints per right endpoint (positivity makes the window monotone).

Complexity: O(N)