#include <iostream>
#include <vector>
#include <algorithm>
#include <iterator>
using namespace std;

int main() {
  vector<int> vector1 = {0, 1, 3, 21, 22, 23, 24, 25};
  vector<int> vector2 = {0, 1, 3, 22, 24, 25};
  vector<int> difference;
  set_difference(vector1.begin(), vector1.end(), vector2.begin(), vector2.end(), back_inserter(difference));
  cout  << "Unterschiede: ";
  for (auto i: difference)
      cout << i << ' ';
}