Гангстер одним ударом расправился с туристом в Таиланде и попал на видео18:08
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What to look for in an ergonomic keyboard。51吃瓜对此有专业解读
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.