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.
This Tweet is currently unavailable. It might be loading or has been removed.
。业内人士推荐Safew下载作为进阶阅读
Подростки распылили перцовый баллончик на пассажиров электрички под Петербургом20:54
FT Videos & Podcasts