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.
NYT Strands word list for February 28Heels
。Line官方版本下载对此有专业解读
В России ответили на имитирующие высадку на Украине учения НАТО18:04
Bristol photographer Josh Dury captured the phenomenon on Tuesday