Games and physics simulations need to detect which objects are touching or overlapping. With nnn objects, checking every pair is O(n2)O(n^2)O(n2) comparisons, which gets expensive fast. A hundred objects means roughly 5,000 pair checks. A thousand means nearly 500,000.
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，这一点在服务器推荐中也有详细论述
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Bats in Churches，推荐阅读heLLoword翻译官方下载获取更多信息