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.
到地方调研，习近平总书记常将地图放在手边，叮嘱各地“自觉打破自家‘一亩三分地’的思维定式，抱成团朝着顶层设计的目标一起做”。
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