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Leetcode 2757. Generate Circular Array Values
Given an integer array and an integer k, produce a new array where each element is the sum of k consecutive elements around the original array (k>0 sums the next k elements, k<0 sums the previous |k| elements, k=0 yields 0), with indices wrapping circularly; solve efficiently using sliding-window or prefix-sum techniques to handle wraparound.
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