View Compilation Error

0_0_39341022_5576.cpp:6:9: error: 'vector' does not name a type
    6 | typedef vector<int> vec;
      |         ^~~~~~
0_0_39341022_5576.cpp:7:9: error: 'pair' does not name a type
    7 | typedef pair<int,int> pii;
      |         ^~~~