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有同乡的朋友,今年也是第一次举家外出围炉,因是临时决定,提前一周才打电话预订,七八家常去的餐馆早已满额,最后只得订一家生面孔。
,更多细节参见同城约会
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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Kind of ugly, but it would work. When the guess is small, you use a