View Compilation Error

0_0_39543249_3102.cpp:12:1: error: 'vector' does not name a type
   12 | vector<int> rec;
      | ^~~~~~
0_0_39543249_3102.cpp: In function 'int main()':
0_0_39543249_3102.cpp:26:17: error: 'rec' was not declared in this scope
   26 |                 rec.clear();
      |                 ^~~