/in/foo.cc: In function 'void ins(int)':
/in/foo.cc:17:20: warning: array subscript has type 'char' [-Wchar-subscripts]
   if(!tr[k][dy[B[i]]])tr[k][dy[B[i]]]=++cnt,f[cnt]=k;
                    ^
/in/foo.cc:17:36: warning: array subscript has type 'char' [-Wchar-subscripts]
   if(!tr[k][dy[B[i]]])tr[k][dy[B[i]]]=++cnt,f[cnt]=k;
                                    ^
/in/foo.cc:18:18: warning: array subscript has type 'char' [-Wchar-subscripts]
   k=tr[k][dy[B[i]]];
                  ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:45:22: warning: array subscript has type 'char' [-Wchar-subscripts]
   now=tr[now][dy[A[i]]];k=now;
                      ^