The efficiency depends on the query size relative to the data distribution. A small query in a sparse region prunes almost everything. A query that covers the whole space prunes nothing (because every node overlaps), degenerating to a brute-force scan. The quadtree gives you the most benefit when your queries are spatially local, which is exactly the common case for map applications, game physics, and spatial databases.
然而，特朗普在這場演說中並未提出太多新政策。
，这一点在同城约会中也有详细论述
（三）为实施考试作弊行为，向他人非法出售、提供考试试题、答案的；
（三）强拿硬要或者任意损毁、占用公私财物的；