#include <iostream>

#include <vector>

using namespace std;

​

int main() {

  vector<string> cars = {"Volvo", "BMW", "Ford", "Mazda"};

  cout << "Size before: " << cars.size() << "\n";

  cars.clear();

  cout << "Size after: " << cars.size() << "\n";

  return 0;

}

​