View Compilation Error

0_0_38809735_9931.cpp: In function 'int bfs()':
0_0_38809735_9931.cpp:46:33: error: 'PII' was not declared in this scope
   46 |                                 PII t = qg.front(); qg.pop();
      |                                 ^~~
0_0_38809735_9931.cpp:47:41: error: 't' was not declared in this scope
   47 |                                 int x = t.x, y = t.y;
      |                                         ^
0_0_38809735_9931.cpp:6:11: error: 'second' was not declared in this scope
    6 | #define y second
      |           ^~~~~~
0_0_38809735_9931.cpp:48:47: note: in expansion of macro 'y'
   48 |                                 if (!check(x, y, tim)) continue;
      |                                               ^
0_0_38809735_9931.cpp:6:11: error: 'second' was not declared in this scope
    6 | #define y second
      |           ^~~~~~
0_0_38809735_9931.cpp:51:64: note: in expansion of macro 'y'
   51 |                                         int a = x + dx[k], b = y + dy[k];
      |                                                                ^