/in/foo.cc: In function 'int main()':
/in/foo.cc:35:16: warning: array subscript has type 'char' [-Wchar-subscripts]
   nxt[fst[cy[i]]] = i;
                ^
/in/foo.cc:36:12: warning: array subscript has type 'char' [-Wchar-subscripts]
   fst[cy[i]] = i;
            ^
/in/foo.cc:39:12: warning: array subscript has type 'char' [-Wchar-subscripts]
   cur[cy[i]] = i;
            ^
/in/foo.cc:41:16: warning: array subscript has type 'char' [-Wchar-subscripts]
   t = cur[cx[i]];
                ^
/in/foo.cc:42:12: warning: array subscript has type 'char' [-Wchar-subscripts]
   cur[cx[i]] = nxt[t];
            ^