「一直到有工作許可之後，那個生活才慢慢好起來。」關恆說。
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Much more than any other programming language.
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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.，更多细节参见夫子
automate the process of writing code