Compilare: user.cpp: In function ‘int main()’: user.cpp:23:11: warning: unused variable ‘i’ [-Wunused-variable] int n,i,j,a,b,x,y,d=1; ^ user.cpp:23:13: warning: unused variable ‘j’ [-Wunused-variable] int n,i,j,a,b,x,y,d=1; ^ user.cpp:23:17: warning: unused variable ‘b’ [-Wunused-variable] int n,i,j,a,b,x,y,d=1; ^