* @param arr 待排序数组
import { Stream } from 'new-streams';
。Line官方版本下载对此有专业解读
The algorithm also visits children in order of distance to the query point. This means it checks the most promising quadrants first, which tends to find a good candidate early and enables aggressive pruning of the remaining quadrants. Without this ordering, the algorithm would still produce the correct result, but it would prune fewer nodes.
（一）故意干扰无线电业务正常进行的；
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