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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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Astronaut Jim Lovell, who guided the Apollo 13 mission safely back to Earth in 1970, has died aged 97.
一方面通过购置税减免、汽车下乡、以旧换新等政策，切实降低用户购车与用车成本。数据显示，2025年，新能源汽车下乡车型数量首次破百，达到124款；且覆盖越野、皮卡、轻卡等不同品类，呈现出明显的消费升级趋势和多元化趋势。