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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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The hoard, which dates to about 50BC and AD50, included five shield bosses and an iron object of unknown origin.，推荐阅读safew官方版本下载获取更多信息
Author(s): Yong Jiang, Tianshou Liang, Jiyuan Zhu
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