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.
Military reckoned ‘good’ Afghan insurgents were separate from ‘bad’ Pakistani insurgents but distinction has blurred
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Дональд ТрампПрезидент США
同时，穆贾希德谴责巴基斯坦多次越境袭击阿境内平民。他称，恐怖组织“巴基斯坦塔利班”与巴军队冲突等问题是巴内部问题，不应转嫁给阿富汗。
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В России ответили на имитирующие высадку на Украине учения НАТО18:04，推荐阅读同城约会获取更多信息