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参看了高德纳的《计算机程序设计艺术》才过了

Posted by redraiment at 2007-05-22 19:53:09 on Problem 1423 
第一卷里有个公式
n! = sqrt(2*π*n) * ((n/e)^n) * (1 + 1/(12*n) + 1/(288*n*n) + O(1/n^3))

π = acos(-1)
e = exp(1)

忽略无穷小 O(1/n^3)

接下来就很简单了。
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