View Compilation Error

0_0_37449894_18703.cpp: In function 'void dfs(int)':
0_0_37449894_18703.cpp:15:12: error: expected unqualified-id before '[' token
  for (auto [v, w] : e[u])
            ^
0_0_37449894_18703.cpp:15:12: error: expected ';' before '[' token
0_0_37449894_18703.cpp:15:13: error: 'v' was not declared in this scope
  for (auto [v, w] : e[u])
             ^
0_0_37449894_18703.cpp:15:16: error: 'w' was not declared in this scope
  for (auto [v, w] : e[u])
                ^
0_0_37449894_18703.cpp: In lambda function:
0_0_37449894_18703.cpp:15:19: error: expected '{' before ':' token
  for (auto [v, w] : e[u])
                   ^
0_0_37449894_18703.cpp: In function 'void dfs(int)':
0_0_37449894_18703.cpp:15:19: error: expected ';' before ':' token
0_0_37449894_18703.cpp:15:19: error: expected primary-expression before ':' token
0_0_37449894_18703.cpp:15:19: error: expected ')' before ':' token
0_0_37449894_18703.cpp:15:19: error: expected primary-expression before ':' token