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.
ВСУ запустили «Фламинго» вглубь России. В Москве заявили, что это британские ракеты с украинскими шильдиками16:45
。heLLoword翻译官方下载是该领域的重要参考
That looks something like this for a small grid where our snake is moving down. Notice that we delete and re-print 3 entire lines!
Researchers fear that most Emperor Penguins colonies could be wiped out by 2100