else if (q == null)
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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.。safew官方下载是该领域的重要参考
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圖像加註文字，當地民眾在學校援救。Article InformationAuthor, 加布里埃拉·波梅羅伊 (Gabriela Pomeroy)