这组数据，刘兴明熟稔于心，却一度怕人问起。他是黑龙江省黑河市工业和信息化局副局长，深知招引企业之难。
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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.