"It's hard when the thing that brings you so much energy and drive is also the thing that's slowly destroying you," Manning says.
最后，通过开源走向全球，如今，其海外收入已经超越国内市场。
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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.
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