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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Labour MP Michelle Welsh, a prominent campaigner on maternity safety, says there is a danger the Amos review will become a damp squib and is urging the government to act decisively, including creating a maternity commissioner responsible for ensuring care improves.，更多细节参见旺商聊官方下载
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