int main()
{
    // ...
    auto employee_less_than = [] (const Employee& lhs, const Employee& rhs)
    		{
      			return lhs.get_balance() < rhs.get_balance();
    		};
    std::vector<Employee> employees_sorted;
    // ...
    int total_funds /* = ... */;
    std::sort(employees_sorted.begin(), employees_sorted.end(), employee_less_than);
    for (auto& e : employees_sorted) {
        if (e.get_salary() <= total_funds) {
            total_funds -= e.get_salary();
            e.pay_salary();
        }
    }
    // ...
}