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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.
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换句话说，中国游艇产业过去之所以规模有限，并不是因为制造能力不足，而是因为需求土壤尚未形成。。safew官方版本下载是该领域的重要参考
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