Compilare: user.c: In function ‘bfs’: user.c:36:13: warning: array subscript has type ‘char’ [-Wchar-subscripts] x=zx+dx[i]; ^ user.c:37:13: warning: array subscript has type ‘char’ [-Wchar-subscripts] y=zy+dy[i]; ^ user.c: In function ‘main’: user.c:54:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("rover.in","r",stdin); ^ user.c:55:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("rover.out","w",stdout); ^