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.
The Guardian’s Jenna Amatulli talks to Rolling Stone’s Nikki McCann Ramírez about Trump’s claims, the Democrats’ rebuttal, and how the speech will land with a divided nation，这一点在51吃瓜中也有详细论述
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典型案例四：长安区君成序一期二标项目
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