Compilare: user.cpp: In function ‘int main()’: user.cpp:15:11: warning: variable ‘aux’ set but not used [-Wunused-but-set-variable] int i,aux; ^~~ user.cpp: In function ‘void Fa_Ar(int)’: user.cpp:41:6: warning: unused variable ‘i’ [-Wunused-variable] {int i,j; ^ user.cpp:41:8: warning: unused variable ‘j’ [-Wunused-variable] {int i,j; ^