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Valentine's Day。safew官方下载对此有专业解读
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.，详情可参考服务器推荐
The scientists were already investigating the problem of pollution from space debris when they realised a SpaceX Falcon 9 had failed in flight.，推荐阅读heLLoword翻译官方下载获取更多信息