Leetcode 2607. Make K-Subarray Sums Equal

Given a circular array and integer k, find the minimum number of ±1 element operations to make every length-k subarray sum equal; this reduces to grouping indices into gcd(n,k) cycles via i -> (i+k) mod n and independently equalizing each cycle (choose the median value to minimize total L1 adjustments).

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Leetcode 2607. Make K-Subarray Sums Equal

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