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.
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controller.enqueue(processChunk(chunk));，更多细节参见51吃瓜
The solution to today's Connections: Sports Edition #521 is...，这一点在WPS下载最新地址中也有详细论述