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.
Science sleuths share their common-sense tips for sniffing out fishy articles.
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"Never Let You Go" by Third Eye Blind (Episode 1)
虽然有不甘，但不得不承认：在 AI 的浪潮之下，编程匠人的时代正悄然走向尾声。