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.
「像鬼一樣工作」：台灣外籍移工為何陷入「強迫勞動」處境
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«На ее [России] территории должно быть создано несколько региональных национальных государств», — рассказал Буданов.