View Compilation Error

0_0_38919644_27243.c:4:1: error: unknown type name 'using'
    4 | using namespace std;
      | ^~~~~
0_0_38919644_27243.c:4:17: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'std'
    4 | using namespace std;
      |                 ^~~