Compilare: user.c: In function ‘main’: user.c:29:13: warning: array subscript has type ‘char’ [-Wchar-subscripts] a[i]=a[x]+dl[card]; ^ user.c:30:13: warning: array subscript has type ‘char’ [-Wchar-subscripts] b[i]=b[x]+dc[card]; ^ user.c:11:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("casa.in","r",stdin); ^ user.c:12:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("casa.out","w",stdout); ^ user.c:13:10: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&q); ^ user.c:18:14: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.c:21:18: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %c",&x,&card); ^ user.c:72:14: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&m); ^ user.c:80:22: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&f[i][j]); ^