View Compilation Error

0_0_39689450_551.cpp:57:9: error: 'pair' does not name a type
   57 | typedef pair<int, int> pii;
      |         ^~~~
0_0_39689450_551.cpp:58:9: error: 'array' does not name a type
   58 | typedef array<int, 3> a3;
      |         ^~~~~