View Compilation Error

0_0_37849064_16755.cpp: In function 'void solve()':
0_0_37849064_16755.cpp:53:14: error: expected unqualified-id before '[' token
         auto [x, y] = a[i];
              ^
0_0_37849064_16755.cpp:54:37: error: 'x' was not declared in this scope
         b[(i - 1) * 4 + 1] = (node){x - 1, y};
                                     ^
0_0_37849064_16755.cpp:54:44: error: 'y' was not declared in this scope
         b[(i - 1) * 4 + 1] = (node){x - 1, y};
                                            ^