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.
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The committee said there was no justification for screening the large majority of men for prostate cancer.
，更多细节参见搜狗输入法2026
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Border Points: Each cluster has a limited number of defined "border points" – these are the gateways in and out of the cluster.