Leetcode 2991. Top Three Wineries

Given a dataset of wineries and their performance metrics (e.g., ratings or sales), return the top three wineries per group (such as region or year) ranked by an aggregate metric, handling ties deterministically. The challenge is computing per-group top‑k efficiently—typically via grouping and aggregation plus per-group ranking (window functions or heaps/selection algorithms).

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Leetcode 2991. Top Three Wineries

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