Compilare: user.cpp: In function ‘int lee(int, int)’: user.cpp:45:14: warning: unused variable ‘xx’ [-Wunused-variable] int k,ok,xx,yy,h,i,j,l,nr; ^ user.cpp:45:17: warning: unused variable ‘yy’ [-Wunused-variable] int k,ok,xx,yy,h,i,j,l,nr; ^ user.cpp:45:26: warning: unused variable ‘l’ [-Wunused-variable] int k,ok,xx,yy,h,i,j,l,nr; ^ user.cpp:45:28: warning: unused variable ‘nr’ [-Wunused-variable] int k,ok,xx,yy,h,i,j,l,nr; ^ user.cpp:68:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^