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第十条 增值税法第十三条所称应税交易，应当同时符合下列条件：
The government uses the Consumer Prices Index (CPI) measure of inflation to calculate public sector pay increases.
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.