#include <iostream>

#include <vector>

#include <algorithm>

using namespace std;

​

int main() {

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

  sort(numbers.begin(), numbers.end());

  auto it = lower_bound(numbers.begin(), numbers.end(), 4);

  if (it != numbers.end()) {

    cout << *it << " is the first value at or above 4";

  } else {

    cout << "No elements found at or above the lower bound";

  }

  return 0;

}

​