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.
// No BYOB request - allocate and enqueue a chunk。业内人士推荐heLLoword翻译官方下载作为进阶阅读
Anglo-Saxon spindle whorl，更多细节参见快连下载-Letsvpn下载
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