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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.
。关于这个话题，旺商聊官方下载提供了深入分析
圖像來源，BBC CHINESE/ TING CHIANG
"published": published,