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.
Professional templates
，更多细节参见51吃瓜
（三）办理本社区居民的公共事务和公益事业，开展便民利民的社区服务活动，关心关爱老年人、儿童、残疾人和困难居民；
Tiny chunks (100B × 10000)
// Consume as text