Eroare de compilare: user.cpp: In function ‘int perfect(long long int)’: user.cpp:11: error: ‘long long’ invalid for ‘y’ user.cpp: In function ‘int main()’: user.cpp:23: error: ‘long long’ invalid for ‘rez2’ user.cpp:27: error: call of overloaded ‘abs(long long int)’ is ambiguous /usr/include/c++/4.4/cmath:94: note: candidates are: double std::abs(double) /usr/include/c++/4.4/cmath:98: note: float std::abs(float) /usr/include/c++/4.4/cmath:102: note: long double std::abs(long double)