View Compilation Error

0_0_18112884_18296.cpp:14:10: error: 'node' was not declared in this scope
 bool cmp(node a,node b)
          ^
0_0_18112884_18296.cpp:14:17: error: 'node' was not declared in this scope
 bool cmp(node a,node b)
                 ^
0_0_18112884_18296.cpp:14:23: error: expression list treated as compound expression in initializer [-fpermissive]
 bool cmp(node a,node b)
                       ^
0_0_18112884_18296.cpp:15:1: error: expected ',' or ';' before '{' token
 {
 ^