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还记得统计阶乘中因子3/5/7...的个数么?

Posted by tzkq at 2010-07-30 03:57:12 on Problem 3219
In Reply To:Re:为什么啊?? Posted by:bbo at 2009-04-18 10:54:34
有个简单的计算方法 n/c+n/c^2+n/c^3....

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