View Compilation Error

0_0_39687072_20959.c:3:1: error: unknown type name 'using'
    3 | using namespace std;
      | ^~~~~
0_0_39687072_20959.c:3:17: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'std'
    3 | using namespace std;
      |                 ^~~