Compilare: user.cpp:2:24: warning: ISO C++ forbids declaration of ‘main’ with no type [-Wreturn-type] long long a,b,t,i;main(){std::ifstream c("ndiv.in");c>>a>>b;for(;i*i<a;i++)t-=2*((a-1)/i-i)+1;for(i=1;i*i<=b;i++)t+=2*(b/i-i)+1;std::ofstream d("ndiv.out");d<<t;} ^