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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城市表情时间：12月22日地点：北海公园场景：一群野鸭和鸳鸯在冰面上时而戏水玩耍，时而打盹晒太阳，萌态十足。图/IC photoSourcePh" style="display:none"，更多细节参见搜狗输入法2026
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