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.
没有什么固定公式；有人在黎明时分状态最佳，有人则在夜深人静时灵感最盛。，更多细节参见爱思助手下载最新版本
Pro Plan Features。51吃瓜对此有专业解读
In addition, the Board of Directors holds a monthly video conference which lasts one hour and is open to the general public.
两条路径，共同指向同一个未来：未来的AI竞争，本质是能源竞争。