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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.，推荐阅读Line官方版本下载获取更多信息
，详情可参考heLLoword翻译官方下载
* @param arr 待排序数组，更多细节参见heLLoword翻译官方下载
（二）不属于增值税法第六条规定的情形。