Compilare: user.c: In function ‘main’: user.c:81:13: warning: array subscript has type ‘char’ [-Wchar-subscripts] fprintf(out, "%d %d %d %d %d %d\n", a[ind1[2]], ^ user.c:82:49: warning: array subscript has type ‘char’ [-Wchar-subscripts] a[ind1[1]], ^ user.c:83:49: warning: array subscript has type ‘char’ [-Wchar-subscripts] a[ind1[0]], ^ user.c:84:49: warning: array subscript has type ‘char’ [-Wchar-subscripts] a[ind2[2]], ^ user.c:85:49: warning: array subscript has type ‘char’ [-Wchar-subscripts] a[ind2[1]], ^ user.c:86:49: warning: array subscript has type ‘char’ [-Wchar-subscripts] a[ind2[0]]); ^ user.c:42:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d %d\n", &N, &S); ^ user.c:46:15: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &a[i]); ^