Hello WOrld in C

#include <iostream>
#include <vector>
using namespace std;
int main()
{
    using MyVector = vector<int>;
    MyVector vectorA( 1 );
    cout << vectorA.size() << " " << vectorA[0] << endl;
    MyVector vectorB( 1, 10 );
    cout << vectorB.size() << " " << vectorB[0] << endl;
    MyVector vectorC(1,22);
    cout << vectorC.size() << " " << vectorC[0] << endl;
    return 0;
}