This is the same idea behind binary search. In a sorted array, you compare against the middle element and eliminate half the remaining candidates. In a quadtree, you choose one of four quadrants and ignore the other three regions. Each level narrows the search space by a factor of four instead of two.
“在中国几千年的文明史上,帝王将相何其多,但在百姓头脑中留下记忆的也不过百来号人。”“青史留名与官阶并无本质联系,而是与做事相联系。”,详情可参考同城约会
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