#include <iostream>

#include <vector>

#include <algorithm>

using namespace std;

​

int main() {

  vector<int> numbers = {1, 7, 3, 5, 9, 2};

  copy(numbers.begin(), numbers.begin() + 3, numbers.begin() + 3);

  for (int number : numbers) {

    cout << number << " ";

  }

  return 0;

}

​