Compilare: user.cpp: In function ‘int main()’: user.cpp:30:15: warning: unused variable ‘i’ [-Wunused-variable] int k,a,n,i,j,d,q,s=1; ^ user.cpp:30:17: warning: unused variable ‘j’ [-Wunused-variable] int k,a,n,i,j,d,q,s=1; ^ user.cpp:30:21: warning: unused variable ‘q’ [-Wunused-variable] int k,a,n,i,j,d,q,s=1; ^