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.
to_be_deleted[classno] = h->next;
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第十一条 行政执法监督机构应当加强对行政执法行为的监督,督促行政执法机关提升行政执法质效,依法开展行政许可、行政处罚、行政强制、行政检查、行政征收征用、行政给付等工作。