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.
Жители Санкт-Петербурга устроили «крысогон»17:52
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I dropped to the floor and couldn't move - spiking can happen anywhere，这一点在雷电模拟器官方版本下载中也有详细论述
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