Compilare: user.cpp:2:80: warning: ISO C++ forbids declaration of ‘main’ with no type [-Wreturn-type] std::ifstream f("cufar.in");long long s,t,n,x,k,o[1<<20],v[1<<20],i=1,j=2;main(){f>>t>>n;for(;i<=n;++i)f>>x>>k,v[x]=k;for(;j<=1e6;++j)if(!o[i])for(i=j;i<=1e6;i+=j)if(++o[i]==v[i])s+=j;std::ofstream("cufar.out")<<s;} ^