#include <iostream>

#include <vector>

#include <algorithm>

using namespace std;

​

int main() {

  vector<int> numbers1 = {1, 4, 9, 16};

  vector<int> numbers2 = {2, 4, 6, 8};

  vector<int> merged(8);

  merge(numbers1.begin(), numbers1.end(), numbers2.begin(), numbers2.end(), merged.begin());

  for (int item : merged) {

    cout << item << " ";

  }

  return 0;

}

​