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.
对协商确定的事项，居民委员会应当及时组织实施或者监督落实；需要提交居民会议或者居民代表会议的，应当召集会议讨论决定。，推荐阅读同城约会获取更多信息
（一）行政执法人员资格、证件管理制度；，这一点在同城约会中也有详细论述
N-Closest Algorithm