text: #pragma once
  
  #include <string>
  using namespace std;
  // Predefined list of structures from a task description
  struct Date {
      int year, month, day;
  };
  
  struct Time {
      int hours, minutes;
  };
  
  struct AirlineTicket {
      string from;
      string to;
      string airline;
      Date departure_date;
      Time departure_time;
      Date arrival_date;
      Time arrival_time;
      int price;
  };
  