Compilare: user.c: In function ‘main’: user.c:19:7: warning: array subscript has type ‘char’ [-Wchar-subscripts] du[i] = 1 + du[p[v[i] + 1]]; ^ user.c:23:7: warning: array subscript has type ‘char’ [-Wchar-subscripts] dc[i] = 1 + dc[p[v[i] - 1]]; ^ user.c:9:9: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &n); ^ user.c:11:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &v[i]); ^