Раскрыты подробности похищения ребенка в Смоленске09:27
siftDown(arr, i, 0); // 对剩余i个元素重新建堆
，详情可参考同城约会
Ghost in the machine，更多细节参见WPS下载最新地址
The pruned nodes (in red) represent entire regions of space that the algorithm never examines. The points inside those regions are never checked. Compare the "Nodes Visited" count to the total number of points. The quadtree is doing far less work than a brute-force scan.