#include <iostream>
#include <string>
using namespace std;


struct Carpool
{
  string groupMembers[5];
  int people;
  Time arrival;
}

Carpool combineCarpool(Carpool car1, Carpool car2);

int main(){

}

Carpool combineCarpool(Carpool car1, Carpool car2)
{
    Carpool ret;
    if(car1.people + car2.people < 5){
        ret.people = 0;
        return ret;
    }
    ret.people = car1.people + car2.people;
    for(int i = 0; i <= 5; i++){
      if(i < car1.groupMembers.size()){
        ret.groupMembers[i] = car1.groupMembers[i]
      }
      else{
        ret.groupMembers[i] = car2.groupMembers[i -car1.groupMembers.size()]
      }
    }
    ret.arrival = earlier(car1.arrival, car2.arrival);
}
___________________________________
#include <iostream>
#include <string>
using namespace std;


class Carpool
{
  public:
    string groupMembers[5];
    int people;
    Time arrival;
    Carpool combineCarpool(Carpool car2);
  void combineCarpool(Carpool car1, Carpool car2);
  Carpool(string g[], int p, Time a){
    for(int i = 0; i < g.size(); i++){
        groupMembers[i] = g[i];
    }
    people = p;
    arrival = a;
  }
  Carpool(){
    groupMembers = {};
    people = -1;
    arrival = {-1, -1};
  }
}

int main(){

}

void Carpool::combineCarpool(Carpool car2)
{
    //Carpool ret;
    if(people + car2.people < 5){
        people = 0;
        return;
    }
    people += car2.people;
    for(int i = groupMembers.size(); i <= 5; i++){
        groupMembers[i] = car2.groupMembers[i - groupMembers.size()]
      }
    }
    arrival = earlier(arrival, car2.arrival);
}