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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The 4732 and its 473x compatriots became the last real IBM ATMs. After a hiatus
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第三十八条 县级以上人民政府应当加强行政执法监督工作保障，将行政执法监督工作所需经费列入本级预算。
安德烈·塔可夫斯基和儿子安德留什卡 图/《殉道学：塔可夫斯基日记 1970-1986》），更多细节参见爱思助手下载最新版本