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Leetcode 523. Continuous Subarray Sum

Check whether any contiguous subarray of length ≥ 2 has a sum that's a multiple of k. This reduces to using prefix-sum modulo k and detecting repeated remainders (with index distance ≥ 2) to prove a subarray sum divisible by k.

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Early October, 2025

Meta

Senior

Interviewer allowed me to treat numbers as positive only, simplifying things

Late September, 2025

Meta

Mid-level

Late August, 2025

Meta

Mid-level

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Leetcode 523. Continuous Subarray Sum

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