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Re:真的很帅，请路过的大牛能解释下其中的原理，先谢了！In Reply To:真的很帅，请路过的大牛能解释下其中的原理，先谢了！ Posted by:nothing828 at 2010-03-13 14:09:28 > for(int i = 2;i*i <= n;++i){
> if( n % i == 0 ){
> ans = ans - ans/i;
> while(n%i == 0){
> n /= i;
> }
> }
> }
> 有点像素数筛法，但具体原理还没有完全明白
ans/i是小于等于ans被i整除的数的个数..
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