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euler phi本来就只考虑质数阿

Posted by frkstyc at 2005-04-23 14:33:02 on Problem 2407
In Reply To:Re:直接brute force就可以? Posted by:uni at 2005-04-23 14:30:28
> 恩,当然得开个平方了.
> 我是用质数算的.只考虑质数,

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