View Compilation Error

0_0_13529207_11728.cpp: In function 'int main()':
0_0_13529207_11728.cpp:135:28: error: no matching function for call to 'DP::dfs(int, int)'
             power.dfs(1, -1);
                            ^
0_0_13529207_11728.cpp:135:28: note: candidate is:
0_0_13529207_11728.cpp:89:10: note: void DP::dfs(int)
     void dfs(int u)
          ^
0_0_13529207_11728.cpp:89:10: note:   candidate expects 1 argument, 2 provided