Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:2:162: error: ‘euclid’ was not declared in this scope std::ifstream f("euclid2.in");std::ofstream g("euclid2.out");int j(int a,int b){return(!a)?b:j(b%a,a);}int main(){int n,a,b;f>>n;while(n--){f>>a>>b;g<<euclid(a,b)<<'\n';}} ^