View Compilation Error

0_0_38798696_32348.cpp: In function 'int main()':
0_0_38798696_32348.cpp:17:9: error: 'vector' was not declared in this scope
   17 |         vector<int> a;
      |         ^~~~~~
0_0_38798696_32348.cpp:3:1: note: 'std::vector' is defined in header '<vector>'; did you forget to '#include <vector>'?
    2 | #include <algorithm>
  +++ |+#include <vector>
    3 | using namespace std;
0_0_38798696_32348.cpp:4:13: error: expected primary-expression before 'long'
    4 | #define int long long
      |             ^~~~
0_0_38798696_32348.cpp:17:16: note: in expansion of macro 'int'
   17 |         vector<int> a;
      |                ^~~
0_0_38798696_32348.cpp:21:17: error: 'a' was not declared in this scope
   21 |                 a.push_back(num);
      |                 ^
0_0_38798696_32348.cpp:27:17: error: 'a' was not declared in this scope
   27 |                 a.push_back(num);
      |                 ^
0_0_38798696_32348.cpp:48:25: error: 'a' was not declared in this scope
   48 |                 cout << a[begin];
      |                         ^