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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.，更多细节参见下载安装 谷歌浏览器 开启极速安全的 上网之旅。
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smart display, where you automatically begin at the top of the