View Compilation Error

0_0_25397925_7640.cpp: In function 'bool cmp(node, node)':
0_0_25397925_7640.cpp:18:22: error: expected primary-expression before '.' token
   return a.num>b.num;.
                      ^
0_0_25397925_7640.cpp:19:1: error: expected unqualified-id before '}' token
 }
 ^