View Compilation Error

0_0_37880741_17271.cpp: In function 'void dfs(int, int)':
0_0_37880741_17271.cpp:18:15: error: two or more data types in declaration of 'V'
  for(int auto V : G[x]){
               ^
0_0_37880741_17271.cpp:19:6: error: 'V' was not declared in this scope
   if(V == f) 
      ^
0_0_37880741_17271.cpp:21:7: error: 'V' was not declared in this scope
   dfs(V, x);
       ^