View Compilation Error

0_0_38967890_27568.cpp: In function 'void Dijkstra()':
0_0_38967890_27568.cpp:8:11: error: request for member 'second' in 'pos.std::pair<long long int, long long int>::second', which is of non-class type 'long long int'
    8 | #define y second
      |           ^~~~~~
0_0_38967890_27568.cpp:43:34: note: in expansion of macro 'y'
   43 |             if(dis[to]>dis[pos.y.y]+a){
      |                                  ^
0_0_38967890_27568.cpp:8:11: error: request for member 'second' in 'pos.std::pair<long long int, long long int>::second', which is of non-class type 'long long int'
    8 | #define y second
      |           ^~~~~~
0_0_38967890_27568.cpp:44:35: note: in expansion of macro 'y'
   44 |                 dis[to]=dis[pos.y.y]+a;
      |                                   ^