Compilare: user.c: In function 'suffix_sort': user.c:17: warning: array subscript has type 'char' user.c:21: warning: array subscript has type 'char' user.c: In function 'solve': user.c:103: warning: suggest parentheses around + or - inside shift user.c:123:5: warning: no newline at end of file user.c: In function 'suffix_sort': user.c:14: warning: 'j' may be used uninitialized in this function