Leetcode 3321. Find X-Sum of All K-Long Subarrays II

For each k-length sliding window, compute the sum of elements that belong to the x most frequent values in that window (ties broken in favor of larger values). The core challenge is maintaining dynamic frequency counts and efficiently selecting the top-x frequent values as the window slides.

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Leetcode 3321. Find X-Sum of All K-Long Subarrays II

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