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.
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Владимир Джабаровпервый зампредседателя комитета Совфеда по международным делам
Nicknamed the father of environmental justice, Robert Bullard argues that researchers in the field have more reason than ever to back up their work with action.