碳酸钙的01妖精的博客

求单个数的欧拉函数longlong eular(longlong n){      longlong ans = n;     for(int i= 2;i*i <= n;i++)    {         if(n% i == 0)       {           ans -= ans/i;           while(n % i == 0) n /= i;       }}   ...

LightOJ-1370 Bi-shoe and Phi-shoe （筛法欧拉函数）Bamboo Pole-vault is a massively popular sport in Xzhiland. And Master Phi-shoe is a very popular coach for his success. He needs some bamboos for his student...