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.
某种程度说，这也是对Sea Expandary必然成功的一种背书。，推荐阅读同城约会获取更多信息
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Yellow: Yearning