View Compilation Error

0_0_39681719_22490.c:2:1: error: unknown type name 'using'
    2 | using namespace std;
      | ^~~~~
0_0_39681719_22490.c:2:17: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'std'
    2 | using namespace std;
      |                 ^~~