#include <iostream>

#include <vector>

#include <algorithm>

using namespace std;

​

bool less_than_10(int value) {

  return value < 10;

}

​

int main() {

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

  if (all_of(numbers.begin(), numbers.end(), less_than_10)) {

    cout << "All of the numbers are less than 10";

  } else {

    cout << "Some numbers are not less than 10";

  }

  return 0;

}

​