if(p->count == 0) {
整个行业打一开始就建立在暧昧不清的规则上：用人类写的东西训练，用别人的开源成果迭代，在法律没有明确禁止的地方快速行动。。关于这个话题，heLLoword翻译官方下载提供了深入分析
，更多细节参见同城约会
Заслуженная артистка РФ призналась, что немцы едят сплошь сосиски в тесте.。关于这个话题，51吃瓜提供了深入分析
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.
So we’ve been working on ways to do more allocations on the stack