View Compilation Error

0_0_38401243_23683.cpp:64:11: error: 'Node' was not declared in this scope
 bool cmp (Node x, Node y) {
           ^
0_0_38401243_23683.cpp:64:19: error: 'Node' was not declared in this scope
 bool cmp (Node x, Node y) {
                   ^
0_0_38401243_23683.cpp:64:25: error: expression list treated as compound expression in initializer [-fpermissive]
 bool cmp (Node x, Node y) {
                         ^
0_0_38401243_23683.cpp:64:27: error: expected ',' or ';' before '{' token
 bool cmp (Node x, Node y) {
                           ^