A quadtree does the same thing for two-dimensional space. It takes a rectangular region and divides it into four equal quadrants: northwest, northeast, southwest, southeast. If a quadrant has too many points in it, it subdivides again and again. Each subdivision creates smaller and smaller cells where points are densely packed.
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第四十六条 违反有关法律法规关于飞行空域管理规定，飞行民用无人驾驶航空器、航空运动器材，或者升放无人驾驶自由气球、系留气球等升空物体，情节较重的，处五日以上十日以下拘留。，更多细节参见同城约会
2. 创建计数数组count，统计每个值出现次数