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.
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CPU - AMD Ryzen 7 PRO 7840U; 8 cores and 16 threads, base clock speed of 3.3 GHz with a maximum boost of 5.1 GHz
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Фото: Алексей Майшев / РИА Новости