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.
Фото: Пати Амирбекова / «Лента.ру»
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Алена Шевченко (корреспондент отдела оперативной информации)
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