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原来如此，多谢~

Posted by waterine at 2006-11-22 10:18:57 on Problem 3090
In Reply To:Re:我就是用这种方法，也TLE的不行... Posted by:daizuyang at 2006-11-19 00:49:08 
> 用欧拉函数
> 比如与30互质的数为 30（1-1/2)(1-1/3)(1-1/5)=8
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