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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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跟当年每晚动辄几万相比，如今的夜总会只能放低身价以求生意上门。“以前，夜总会不是一般人消费得起的，进去的人都是有钱有身份，小姐素质也好。现在，人家都看不起你，觉得你是做这行的。”