answer.code: In function ‘void dij()’:
answer.code:111:39: error: template argument 1 is invalid
  111 |     priority_queue <data, vector <data>, greater<data>> pq;
      |                                       ^
answer.code:111:39: error: template argument 2 is invalid
answer.code:111:50: error: template argument 1 is invalid
  111 |     priority_queue <data, vector <data>, greater<data>> pq;
      |                                                  ^~~~
answer.code:111:54: error: template argument 1 is invalid
  111 |     priority_queue <data, vector <data>, greater<data>> pq;
      |                                                      ^~
answer.code:111:54: error: template argument 2 is invalid
answer.code:111:54: error: template argument 3 is invalid
answer.code:112:8: error: request for member ‘push’ in ‘pq’, which is of non-class type ‘int’
  112 |     pq.push({0, h});
      |        ^~~~
answer.code:114:16: error: request for member ‘empty’ in ‘pq’, which is of non-class type ‘int’
  114 |     while (!pq.empty())
      |                ^~~~~
answer.code:116:26: error: request for member ‘top’ in ‘pq’, which is of non-class type ‘int’
  116 |         double dist = pq.top().first;
      |                          ^~~
answer.code:117:22: error: request for member ‘top’ in ‘pq’, which is of non-class type ‘int’
  117 |         point p = pq.top().second;
      |                      ^~~
answer.code:118:12: error: request for member ‘pop’ in ‘pq’, which is of non-class type ‘int’
  118 |         pq.pop();
      |            ^~~
answer.code:132:24: error: request for member ‘push’ in ‘pq’, which is of non-class type ‘int’
  132 |                     pq.push({d[x][y], {x, y}});
      |                        ^~~~
answer.code: In function ‘int main()’:
answer.code:154:12: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
  154 |     freopen("J.INP", "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~