View Compilation Error

0_0_25486833_15570.cpp: In function 'int main()':
0_0_25486833_15570.cpp:101:21: error: too many arguments to function 'void dfs(int)'
         dfs(root , 0);
                     ^
0_0_25486833_15570.cpp:69:6: note: declared here
 void dfs(int u)
      ^