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一直看不懂题目,后来知道求N!末尾的0个数!按5的倍数递归:5,10,15,20,25。。。。。。那么N中有几个约数有5的,由C++取整,刚好是N/5的值!

Posted by ccut_38102011 at 2012-12-03 21:15:02 on Problem 1401


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