Why does this matter?
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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‘Bridgerton’ Season 3 has the internet upset for all the wrong reasons
“A victory for life.” That was the triumphal message from Indigenous campaigners in the Brazilian Amazon this week after they staved off a threat to the Tapajós River by occupying a grain terminal operated by Cargill, the biggest privately owned company in the United States.