View Compilation Error

0_0_21571649_27311.cpp: In member function 'void Link_Cut_Tree::Link(int, int)':
0_0_21571649_27311.cpp:98:35: error: return-statement with a value, in function returning 'void' [-fpermissive]
   if(Judge(u,v))return puts("-1"),0;
                                   ^
0_0_21571649_27311.cpp: In member function 'void Link_Cut_Tree::Cut(int, int)':
0_0_21571649_27311.cpp:102:36: error: return-statement with a value, in function returning 'void' [-fpermissive]
   if(!Judge(u,v))return puts("-1"),0;
                                    ^
0_0_21571649_27311.cpp: In member function 'void Link_Cut_Tree::Modify(int, int, int)':
0_0_21571649_27311.cpp:108:36: error: return-statement with a value, in function returning 'void' [-fpermissive]
   if(!Judge(u,v))return puts("-1"),0;
                                    ^