题目大意是不大于n的与n互质的数的个数。
用经典的欧拉函数来求就是了，phi(n)=n*∑(1-1/p)(p为n的质数因子)。
3018986 2008-08-02 23:26:46 Accepted 1906 FPC 00:00.00 408K IwfWcf
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