コンパイルエラー

./Main.c:2:1: error: unknown type name 'using'
    2 | using namespace std;
      | ^~~~~
./Main.c:2:17: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'std'
    2 | using namespace std;
      |                 ^~~
./Main.c:3:1: error: unknown type name 'using'
    3 | using namespace atcoder;
      | ^~~~~
./Main.c:3:17: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'atcoder'
    3 | using namespace atcoder;
      |                 ^~~~~~~
./Main.c:5:15: error: expected '=', ',', ';', 'asm' or '__attribute__' before '<' token
    5 | typedef vector<int> vi;
      |               ^
./Main.c:6:15: error: expected '=', ',', ';', 'asm' or '__attribute__' before '<' token
    6 | typedef vector<long long> vl;
      |               ^
./Main.c:7:15: error: expected '=', ',', ';', 'asm' or '__attribute__' before '<' token
    7 | typedef vector<vector<int>> vvi;
      |               ^
./Main.c:8:15: error: expected '=', ',', ';', 'asm' or '__attribute__' before '<' token
    8 | typedef vector<vector<long long>> vvl;
      |               ^
./Main.c:9:13: error: expected '=', ',', ';', 'asm' or '__attribute__' before '<' token
    9 | typedef pair<int,int> P;
      |             ^
./Main.c: In function 'main':
./Main.c:14:3: error: 'cin' undeclared (first use in this function)
   14 |   cin >> n;
      |   ^~~
./Main.c:14:3: note: each undeclared identifier is reported only once for each function it appears in
./Main.c:17:3: error: 'cout' undeclared (first use in this function)
   17 |   cout << x << "\n";
      |   ^~~~