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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.，这一点在51吃瓜中也有详细论述
史密斯同時也是慈善機構「英國子宮移植」（Womb Transplant UK）的創辦人。貝爾與鮑威爾為表達對史密斯的感謝，為兒子取了「理查德」（Richard）作為中間名。。业内人士推荐夫子作为进阶阅读
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