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02 对中国意味着什么？东数西算+国家统筹，我们早已走在前面
。同城约会是该领域的重要参考
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.
"I was reading a magazine article on the Gemini astronauts. I was probably nine years old, and I thought that's the coolest thing. That's what I want to do," she says.