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Leetcode 1610. Maximum Number of Visible Points
Convert each point to its polar angle around your location (counting points at the exact location separately), sort these angles and handle the circular wrap (e.g., by duplicating angles +360°), then use a sliding window / two-pointer scan to find the maximum number of points within any angular interval of width = angle; expected O(n log n) for n up to 1e5.
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