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.
About half of all churches in England have bats in them
。夫子是该领域的重要参考
去年，我注意到一个有些反直觉的现象。
Can world models touch grass?
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