View Compilation Error

0_0_28005074_5346.cpp: In member function 'void AC_Automaton::newnode()':
0_0_28005074_5346.cpp:25:12: error: return-statement with a value, in function returning 'void' [-fpermissive]
     return sz;
            ^
0_0_28005074_5346.cpp: In member function 'void AC_Automaton::insert(char*, int)':
0_0_28005074_5346.cpp:32:55: error: void value not ignored as it ought to be
       if (!trie[now][(int)s[i]]) trie[now][(int)s[i]] = newnode();
                                                       ^