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.
От границы Сумской области Украины до края Чувашии около 800 километров. Регион входит в Приволжский федеральный округ и граничит с Ульяновской и Нижегородской областями, Республикой Марий Эл, Татарстаном и Мордовией.
，这一点在safew官方版本下载中也有详细论述
5 transform chain
More Top Stories'I wanted to save her life' - the moment twin sisters learned they were identical
港大經濟學家阮穎嫻也認為，對於將寵物視作家庭成員的飼主來說，提供寵物餐點，「作為營銷來說是比較吸引的」，而一些寵物友善餐廳目前已有提供的寵物餐點，其實人類也可食用。