View Compilation Error

0_0_17340707_4807.cpp: In function 'int dfs(tire*, tire*)':
0_0_17340707_4807.cpp:37:26: error: 'flag' was not declared in this scope
      if(!dfs(p1->l,p2->l,flag)) return 0;
                          ^
0_0_17340707_4807.cpp:38:26: error: 'flag' was not declared in this scope
      if(!dfs(p1->r,p2->r,flag)) return 0;
                          ^
0_0_17340707_4807.cpp: In function 'int main()':
0_0_17340707_4807.cpp:66:28: error: too many arguments to function 'int dfs(tire*, tire*)'
         dfs(root,root2,flag);
                            ^
0_0_17340707_4807.cpp:34:5: note: declared here
 int dfs(tire *p1,tire *p2){
     ^