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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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警方使用催泪瓦斯驱散人群，但部分民众多次返回现场，严重干扰了救援工作和现场控制。
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