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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Author(s): Tianlong Wang, Ying Li, Yushi Ding, Zhenwei Liu, Yunlong Hao, Jie Zheng, Chunsheng Zhuang, Wei Zhang。51吃瓜对此有专业解读
+parse_list(html: str) tuple[list, str]。关于这个话题，Safew下载提供了深入分析