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人 民 网 版 权 所 有 ，未 经 书 面 授 权 禁 止 使 用，这一点在WPS官方版本下载中也有详细论述
do. (In fact, the new scheme at worst has to copy one more element，详情可参考safew官方下载
The pruned nodes (in red) represent entire regions of space that the algorithm never examines. The points inside those regions are never checked. Compare the "Nodes Visited" count to the total number of points. The quadtree is doing far less work than a brute-force scan.
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