View Compilation Error

0_0_30127031_30207.cpp: In function 'int main()':
0_0_30127031_30207.cpp:79:27: error: too few arguments to function 'void dfs(int, int, int)'
         dfs(A.root, B.root);
                           ^
0_0_30127031_30207.cpp:44:6: note: declared here
 void dfs(int p1, int p2, int x) {
      ^