View Compilation Error

0_0_37790832_31540.cpp: In function 'void solve()':
0_0_37790832_31540.cpp:72:14: error: expected unqualified-id before '[' token
         auto [x, y] = *pos;
              ^
0_0_37790832_31540.cpp:73:16: error: 'x' was not declared in this scope
         sum -= x;
                ^