The efficiency depends on the query size relative to the data distribution. A small query in a sparse region prunes almost everything. A query that covers the whole space prunes nothing (because every node overlaps), degenerating to a brute-force scan. The quadtree gives you the most benefit when your queries are spatially local, which is exactly the common case for map applications, game physics, and spatial databases.
DTF St. Louis' structure is infuriating.，这一点在WPS官方版本下载中也有详细论述
。WPS下载最新地址对此有专业解读
prepared by tellers, but actually automate the handling of the checks
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