For well-distributed points, nearest neighbor search is often near O(logn)O(\log n)O(logn) in practice. In the worst case (all points clustered tightly or along a line), it can degrade to O(n)O(n)O(n), but this is uncommon with typical spatial data.
在集上买东西，买不了吃亏，买不了上当，但明显贵的东西，一准儿得长心。
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Фото: U.S. Marine Corps / Lance Cpl. Tyler Forti