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.
重点区域示范，引领效应日益凸显
依法或者经批准、授权开展的，应当在活动实施五个工作日前向县级以上公安机关报告。法律、行政法规另有规定的，从其规定。。关于这个话题，Line官方版本下载提供了深入分析
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The core of OsmAnd's HH-Routing is an elegant two-level hierarchy built upon "area clusters."