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.
Британский самолет-разведчик Boeing RC-135W Rivet Joint совершил полет над Черным морем в районе Крыма. Об этом сообщает РИА Новости, ссылаясь на анализ полетных данных.
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在互联网时代，这是搜索引擎与应用商店的世界，但在AI时代，它可能属于那个24小时贴身的AI硬件。