Compilare: user.c: In function ‘main’: user.c:52:3: warning: array subscript has type ‘char’ [-Wchar-subscripts] ult[s[0][lun[0]]] = 0; ^ user.c:57:5: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(ult[s[i][0]] == -1){ ^ user.c:62:7: warning: array subscript has type ‘char’ [-Wchar-subscripts] len[i] = len[ult[s[i][0]]] + 1; ^ user.c:63:7: warning: array subscript has type ‘char’ [-Wchar-subscripts] prec[i] = ult[s[i][0]]; ^ user.c:65:5: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(ult[s[i][lun[i]]] == -1 || ^ user.c:66:8: warning: array subscript has type ‘char’ [-Wchar-subscripts] (ult[s[i][lun[i]]] != -1 && len[ult[s[i][lun[i]]]] < len[i])) ^ user.c:66:8: warning: array subscript has type ‘char’ [-Wchar-subscripts] user.c:67:7: warning: array subscript has type ‘char’ [-Wchar-subscripts] ult[s[i][lun[i]]] = i; ^ user.c:30:9: warning: ‘nl’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(nl){ ^