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.
"satisfiable": true,，这一点在同城约会中也有详细论述
。关于这个话题，heLLoword翻译官方下载提供了深入分析
that this depends on the fact that the backing store does not escape，这一点在WPS官方版本下载中也有详细论述
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