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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.
。关于这个话题，51吃瓜提供了深入分析
安東尼·澤尼爾（Anthony Zurcher），BBC駐北美記者
怎样创造政绩？关键靠实干，这是最质朴的方法论，是成就事业的必由之路。
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$19.99 at Nintendo。91视频对此有专业解读
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