/in/foo.cc: In member function 'void Trie::build()':
/in/foo.cc:57:29: error: invalid types 'int[int]' for array subscript
      if(end[Next[fail[now][i]][i]])
                             ^
/in/foo.cc:58:21: error: invalid types 'int[int]' for array subscript
       end[Next[now[i]]] = 1;
                     ^