Compilare: user.c: In function ‘main’: user.c:8:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("zaharel.in","r",stdin); ^ user.c:9:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("zaharel.out","w",stdout); ^ user.c:10:10: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&m); ^ user.c:13:14: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %c",&x,&y,&c); ^ user.c:21:15: warning: ‘yy’ may be used uninitialized in this function [-Wmaybe-uninitialized] fr[xx][yy]=-1; ^ user.c:21:15: warning: ‘xx’ may be used uninitialized in this function [-Wmaybe-uninitialized]