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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被询问人要求就被询问事项自行提供书面材料的，应当准许；必要时，人民警察也可以要求被询问人自行书写。
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