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Re:其实这道题可以用这个公式

Posted by 1106100205 at 2012-08-12 17:07:14 on Problem 1423
In Reply To:其实这道题可以用这个公式 Posted by:slp at 2010-09-14 22:34:35
> 其实这道题可以用这个公式
> tmp = sum( log10(i) ) 0<i<=n
> len(n!)=(int)(tmp)+1
> 打表即可过了...    500ms
> 公式的证明我还不会,求证明:

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