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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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第十四条 行政执法监督机构根据工作需要，综合运用日常监督、重点监督、专项监督等方式，对行政执法工作进行全方位、全流程、常态化、长效化监督。
To discover more fascinating science content, head to bbc.co.uk, search for BBC Inside Science and follow the links to The Open University.