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.
提效降本：从 T+1 到实时，构建统一数据湖，推荐阅读服务器推荐获取更多信息
，更多细节参见91视频
Trump eyes Venezuela visit – but obstacles to his oil plan remain，更多细节参见搜狗输入法下载
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