View Compilation Error

0_0_37836103_24823.cpp: In function 'void dfs(int, int)':
0_0_37836103_24823.cpp:37:13: error: expected unqualified-id before '[' token
   for (auto [w, v] : e[x])
             ^
0_0_37836103_24823.cpp:37:13: error: expected ';' before '[' token
0_0_37836103_24823.cpp:37:14: error: 'w' was not declared in this scope
   for (auto [w, v] : e[x])
              ^
0_0_37836103_24823.cpp:37:17: error: 'v' was not declared in this scope
   for (auto [w, v] : e[x])
                 ^
0_0_37836103_24823.cpp: In lambda function:
0_0_37836103_24823.cpp:37:20: error: expected '{' before ':' token
   for (auto [w, v] : e[x])
                    ^
0_0_37836103_24823.cpp: In function 'void dfs(int, int)':
0_0_37836103_24823.cpp:37:20: error: expected ';' before ':' token
0_0_37836103_24823.cpp:37:20: error: expected primary-expression before ':' token
0_0_37836103_24823.cpp:37:20: error: expected ')' before ':' token
0_0_37836103_24823.cpp:37:20: error: expected primary-expression before ':' token