Compilare: user.cpp: In function ‘int main()’: user.cpp:24:10: warning: unused variable ‘x’ [-Wunused-variable] int n,i,x,y,s=0,j,k,val; ^ user.cpp:24:12: warning: unused variable ‘y’ [-Wunused-variable] int n,i,x,y,s=0,j,k,val; ^ user.cpp:24:14: warning: unused variable ‘s’ [-Wunused-variable] int n,i,x,y,s=0,j,k,val; ^ user.cpp:24:22: warning: unused variable ‘val’ [-Wunused-variable] int n,i,x,y,s=0,j,k,val; ^