Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:3: error: ‘niv’ was not declared in this scope user.cpp:4: error: ‘citeste_graf’ was not declared in this scope user.cpp:5: error: ‘df’ was not declared in this scope user.cpp:7: error: ‘i’ was not declared in this scope user.cpp:7: error: ‘n’ was not declared in this scope user.cpp:11: error: ‘g’ was not declared in this scope user.cpp:12: error: ‘n’ was not declared in this scope user.cpp:17: error: ‘g’ was not declared in this scope user.cpp:2: warning: unused variable ‘x’ user.cpp:2: warning: unused variable ‘y’