数据来源：深圳方方乐趣中英文学校
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.。heLLoword翻译官方下载是该领域的重要参考
麥永剛說，在中國工作其實極具挑戰性，只有享受挑戰的人才會覺得有趣。中國每個月的驚喜從不間斷。。关于这个话题，旺商聊官方下载提供了深入分析
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