Compilare: user.cpp: In function ‘int main()’: user.cpp:47:11: warning: unused variable ‘xi’ [-Wunused-variable] int n,xi,yi,m,j,i,s; ^ user.cpp:47:14: warning: unused variable ‘yi’ [-Wunused-variable] int n,xi,yi,m,j,i,s; ^ user.cpp:47:23: warning: unused variable ‘s’ [-Wunused-variable] int n,xi,yi,m,j,i,s; ^ user.cpp: In function ‘void lee()’: user.cpp:40:9: warning: ‘s’ may be used uninitialized in this function [-Wmaybe-uninitialized] g<<s; ^