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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.，这一点在爱思助手下载最新版本中也有详细论述
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After producing several hits through the early 1960s, he later returned to Billboard's Top 10 chart in 1975 after writing the song Love Will Keep Us Together for duo Captain & Tennille. He also recorded several albums for Elton John's record label in the 1970s.
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Message patterns can also be configured with arbitrary conditions: