private static void RemoveSortedCard(List <TravelCard> cardsList, TravelCard card, Dictionary <string, string> departureToDestination,
Dictionary <string, string> destinationToDeparture)
{
cardsList.Remove(card);
departureToDestination.Remove(card.DeparturePoint);
destinationToDeparture.Remove(card.DestinationPoint);
}
public static List <TravelCard> SortTravelCards(List <TravelCard> cardsList2)
{
List <TravelCard> cardsList = new List <TravelCard>(cardsList2);
TravelCard[] sortedList = new TravelCard[cardsList.Count];
var departureToDestination = cardsList.ToDictionary(card => card.DeparturePoint, card => card.DestinationPoint);
var destinationToDeparture = cardsList.ToDictionary(card => card.DestinationPoint, card => card.DeparturePoint);
int leftIndex = 0;
int rightIndex = cardsList.Count - 1;
int i = 0;
while (cardsList.Count > 0)
{
foreach (TravelCard card in cardsList)
{
if (!destinationToDeparture.ContainsKey(card.DeparturePoint))
{
sortedList[leftIndex] = card;
RemoveSortedCard(cardsList, card, departureToDestination, destinationToDeparture);
leftIndex++;
break;
}
if (!departureToDestination.ContainsKey(card.DestinationPoint))
{
sortedList[rightIndex] = card;
RemoveSortedCard(cardsList, card, departureToDestination, destinationToDeparture);
rightIndex--;
break;
}
}
i++;
}
return(sortedList.ToList());
}