文件名称:acm3
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两边取常用对数，即可算出log10(N!),向上取整即为N!的位数
-Take the common logarithm of both sides, can be calculated log10 (N!), rounding up is N! Digits
-Take the common logarithm of both sides, can be calculated log10 (N!), rounding up is N! Digits
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acm3.cpp