Compilare: user.cpp: In function ‘int main()’: user.cpp:8:9: warning: unused variable ‘n’ [-Wunused-variable] int n,i,j,k=0; ^ user.cpp:8:11: warning: unused variable ‘i’ [-Wunused-variable] int n,i,j,k=0; ^ user.cpp:8:13: warning: unused variable ‘j’ [-Wunused-variable] int n,i,j,k=0; ^