第二十一条 核燃料循环设施建设项目由国务院核工业主管部门依法审批或者核准，重大项目报国务院审批或者核准。申请条件、审批程序和时限等按照国家规定执行。
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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