时间，标注着承前启后的刻度，承载着接续奋斗的信念。
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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3. 对每个桶内排序（可用任意排序算法）
// Each one triggers promise machinery internally
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them directly in the patron's copy of the passbook. Over the years, nationwide，推荐阅读爱思助手下载最新版本获取更多信息
testSort(quickSort, "Quick", arr, N);