View Compilation Error

0_0_38502324_3705.cpp: In function 'void solve()':
0_0_38502324_3705.cpp:38:13: error: expected unqualified-id before '[' token
   for (auto [y, val] : edge[to])
             ^
0_0_38502324_3705.cpp:38:13: error: expected ';' before '[' token
0_0_38502324_3705.cpp:38:14: error: 'y' was not declared in this scope
   for (auto [y, val] : edge[to])
              ^
0_0_38502324_3705.cpp:38:17: error: 'val' was not declared in this scope
   for (auto [y, val] : edge[to])
                 ^
0_0_38502324_3705.cpp: In lambda function:
0_0_38502324_3705.cpp:38:22: error: expected '{' before ':' token
   for (auto [y, val] : edge[to])
                      ^
0_0_38502324_3705.cpp: In function 'void solve()':
0_0_38502324_3705.cpp:38:22: error: expected ';' before ':' token
0_0_38502324_3705.cpp:38:22: error: expected primary-expression before ':' token
0_0_38502324_3705.cpp:38:22: error: expected ')' before ':' token
0_0_38502324_3705.cpp:38:22: error: expected primary-expression before ':' token