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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默茨总理感谢中国政府在中国农历春节之后对其作为新年首位访华的外国领导人予以的热情接待。
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But she revealed at the Wales Screen Summit in October that she had considered quitting acting because of a lack of quality roles for women.，更多细节参见快连下载安装
今年前三季度销售开支到了 12.80 亿，比去年一整年花的还多……