The dashed circle shows the current best distance. As the algorithm finds closer points, the circle shrinks, which causes more subtrees to fail the "could contain a closer point?" test and get pruned. The search usually gets cheaper as it progresses.
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。关于这个话题，雷电模拟器官方版本下载提供了深入分析
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（十）在查处违反治安管理活动时，为违法犯罪行为人通风报信的；