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.
看得出来，大家对于屏幕素质的重视程度依然非常在线。
。关于这个话题，Line官方版本下载提供了深入分析
Овечкин продлил безголевую серию в составе Вашингтона09:40
至此，Sun City的老人终于有了自己的专业医疗支持。
quite a legacy: now you know the reason that so many later ATMs ran OS/2. IBM,