public void ReplaceCard(AbstractCombinatoricsPuzzleCard card)
{
if (card != null && DeadCards.Contains(card))
{
Deck.Add(card);
DeadCards.Remove(card);
}
}
public AbstractCombinatoricsPuzzleCard DrawCard()
{
AbstractCombinatoricsPuzzleCard card = null;
if (Deck.Count > 0)
{
lock (Deck)
{
card = Deck[0];
Deck.Remove(card);
DeadCards.Insert(0, card);
}
}
return(card);
}
/// <summary>
/// Richard Durstenfeld version of Fisher–Yates shuffle -- To shuffle an array a of n elements(indices 0..n-1):
/// for i from n−1 downto 1 do
/// j ← random integer such that 0 ≤ j ≤ i
/// exchange a[j] and a[i]
/// </summary>
private void Shuffle()
{
lock (Deck)
{
AbstractCombinatoricsPuzzleCard tempCard = null;
for (int index = Deck.Count - 1; index > 0; index--)
{
int random = Random.Next(0, index + 1);
if (index != random)
{
tempCard = Deck[index];
Deck[index] = Deck[random];
Deck[random] = tempCard;
}
}
}
}
