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.
新华社曾报道，首次审议后，医疗保障法草案曾在中国人大网公开征求意见期间，共收到617人次提出的2562条意见，另收到来信20封。主要意见包括：进一步完善多层次医疗保障体系，细化明确职工基本医疗保险、城乡居民基本医疗保险相关规定，加强灵活就业人员等参保支持和待遇保障，明确定点医药机构义务和责任，强化医疗保障基金监管，完善医保领域违法行为法律责任规定等。。同城约会对此有专业解读
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