The system is intended to remain fully NetBSD-native.
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.
，更多细节参见同城约会
Yellow: Yearning
Особенно об опасности на трассе предупредили водителей грузовых автомобилей. Рекомендуется соблюдать дистанцию, избегать резких маневров и интенсивного торможения.