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，这一点在同城约会中也有详细论述
充电线这个原本不起眼的小玩意直接变成了刚需，你家里 3 根，办公室 2 根，车里 1 根，包里还老是要备 1 根。需求蹭蹭就上去了。
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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.