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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.。Line官方版本下载是该领域的重要参考
，详情可参考同城约会
Юлия Мискевич (Ночной линейный редактор)，详情可参考服务器推荐
This is how it works now: