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.
support remote peripherals (over leased telephone line) in branches. The 3600
，这一点在搜狗输入法2026中也有详细论述
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（五）向场内投掷杂物，不听制止的；
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