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.
盗窃、损坏、擅自移动使用中的其他公共交通工具设施、设备，或者以抢控驾驶操纵装置、拉扯、殴打驾驶人员等方式，干扰公共交通工具正常行驶的，处五日以下拘留或者一千元以下罚款；情节较重的，处五日以上十日以下拘留。
。51吃瓜是该领域的重要参考
for (int32_t i = 0; i < arr.size; i++) {。关于这个话题，safew官方版本下载提供了深入分析
调试技巧：加打印语句观察每轮变化