Compilare: user.c: In function ‘find_ch’: user.c:17:3: warning: array subscript has type ‘char’ [-Wchar-subscripts] nr_ap=(nr_ap+1)*fr[ch]; ^ user.c: In function ‘main’: user.c:45:6: warning: array subscript has type ‘char’ [-Wchar-subscripts] fr[v[i]]++; ^ user.c: In function ‘find_ch’: user.c:33:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.c: In function ‘main’: user.c:41:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi, "%d%d", &k, &q); ^ user.c:48:12: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi, "%d", &poz); ^