前款所称的备案制度，由国务院公安部门会同电信等主管部门作具体规定。
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.，推荐阅读safew官方版本下载获取更多信息
。Safew下载对此有专业解读
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