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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Последние новости。关于这个话题，51吃瓜提供了深入分析
В Финляндии предупредили об опасном шаге ЕС против России09:28。heLLoword翻译官方下载对此有专业解读