Екатерина Щербакова (ночной линейный редактор)
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.，更多细节参见一键获取谷歌浏览器下载
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他们大多是社区里的退休居民，用无偿服务，既降低了医院的运营成本，也给老年患者带来了专属的温暖。