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.
第八十三条 有下列行为之一的，处十日以上十五日以下拘留，可以并处五千元以下罚款；情节较轻的，处五日以下拘留或者一千元以下罚款：
。im钱包官方下载是该领域的重要参考
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Two tunnels have been bored 1.8 miles (3km) under the Severn Estuary which will deliver 120,000 litres of water per second into the cooling system.