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.
“我这次全程超过2500公里的驾驶里程，期间只有一次遇到了充电排队，而且也只等待了20分钟。”
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[그림책 속 그림 읽기]다 끝난듯 했는데 생각지않았던 일이… ‘엄마의 여행가방’，更多细节参见heLLoword翻译官方下载
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