Question

我正在尝试生成扑克牌的所有不同组合，如下所述：

但我一直卡住了。当在上面的URL上尝试NickLarsen的C＃答案时，我在第49行遇到了未处理的异常错误。（https://stackoverflow.com/a/3832781/689881）

我想要的是非常简单：生成所有卡片组合并在简单的.txt文件中一次打印一行

另外，我实际上想要所有7张卡组合（而不是5张）。例如，前两行可能如下所示：

2c2d2h2s3c3d3h
2c2d2h2s3c3d3s

我如何实现这一目标？速度并不重要。

以下是来自NickLarsen（我的修改）的代码失败：

using System;
using System.Collections.Generic;
using System.Linq;

namespace ConsoleApplication20
{
struct Card
{
    public int Suit { get; set; }
    public int Rank { get; set; }
}

class Program
{
    static int ranks = 13;
    static int suits = 4;
    static int cardsInHand = 7;

    static void Main(string[] args)
    {
        List<Card> cards = new List<Card>();
        //cards.Add(new Card() { Rank = 0, Suit = 0 });
        int numHands = GenerateAllHands(cards);

        Console.WriteLine(numHands);
        Console.ReadLine();
    }

    static int GenerateAllHands(List<Card> cards)
    {
        if (cards.Count == cardsInHand) return 1;

        List<Card> possibleNextCards = GetPossibleNextCards(cards);

        int numSubHands = 0;

        foreach (Card card in possibleNextCards)
        {
            List<Card> possibleNextHand = cards.ToList(); // copy list
            possibleNextHand.Add(card);
            numSubHands += GenerateAllHands(possibleNextHand);
        }

        return numSubHands;
    }

    static List<Card> GetPossibleNextCards(List<Card> hand)
    {
        int maxRank = hand.Max(x => x.Rank);

        List<Card> result = new List<Card>();

        // only use ranks >= max
        for (int rank = maxRank; rank < ranks; rank++)
        {
            List<int> suits = GetPossibleSuitsForRank(hand, rank);
            var possibleNextCards = suits.Select(x => new Card { Rank = rank, Suit = x });
            result.AddRange(possibleNextCards);
        }

        return result;
    }

    static List<int> GetPossibleSuitsForRank(List<Card> hand, int rank)
    {
        int maxSuit = hand.Max(x => x.Suit);

        // select number of ranks of different suits
        int[][] card = GetArray(hand, rank);

        for (int i = 0; i < suits; i++)
        {
            card[i][rank] = 0;
        }

        int[][] handRep = GetArray(hand, rank);

        // get distinct rank sets, then find which ranks they correspond to
        IEnumerable<int[]> distincts = card.Distinct(new IntArrayComparer());

        List<int> possibleSuits = new List<int>();

        foreach (int[] row in distincts)
        {
            for (int i = 0; i < suits; i++)
            {
                if (IntArrayComparer.Compare(row, handRep[i]))
                {
                    possibleSuits.Add(i);
                    break;
                }
            }
        }

        return possibleSuits;
    }

    class IntArrayComparer : IEqualityComparer<int[]>
    {
        #region IEqualityComparer<int[]> Members

        public static bool Compare(int[] x, int[] y)
        {
            for (int i = 0; i < x.Length; i++)
            {
                if (x[i] != y[i]) return false;
            }

            return true;
        }

        public bool Equals(int[] x, int[] y)
        {
            return Compare(x, y);
        }

        public int GetHashCode(int[] obj)
        {
            return 0;
        }

        #endregion
    }

    static int[][] GetArray(List<Card> hand, int rank)
    {
        int[][] cards = new int[suits][];
        for (int i = 0; i < suits; i++)
        {
            cards[i] = new int[ranks];
        }

        foreach (Card card in hand)
        {
            cards[card.Suit][card.Rank] = 1;
        }

        return cards;
    }
}
}

Answer 1

这是因为您已注释掉//cards.Add(new Card() { Rank = 0, Suit = 0 });。您的cards列表为空，而您的代码找不到空数组的max - 这是可预测的。

Answer 2

我参加派对有点晚了，但有相同的需求（5张扑克牌）。另外在Nick Larsen的工作（看似不完美，因为我也得到了错误的数字）回答另一个线程，只需添加一个方法来获取卡的名称（我相信有人可以更优雅地做到这一点，但它有效）：

    static string GetCardName(Card card)
    {
        string cardName;
        string cardFace;
        string cardSuit;

        switch (card.Rank)
        {
            case 0:
                cardFace = "2";
                break;
            case 1:
                cardFace = "3";
                break;
            case 2:
                cardFace = "4";
                break;
            case 3:
                cardFace = "5";
                break;
            case 4:
                cardFace = "6";
                break;
            case 5:
                cardFace = "7";
                break;
            case 6:
                cardFace = "8";
                break;
            case 7:
                cardFace = "9";
                break;
            case 8:
                cardFace = "10";
                break;
            case 9:
                cardFace = "J";
                break;
            case 10:
                cardFace = "Q";
                break;
            case 11:
                cardFace = "K";
                break;
            default:
                cardFace = "A";
                break; 
        }

        switch (card.Suit)
        {
            case 0:
                cardSuit = "H";
                break;
            case 1:
                cardSuit = "D";
                break;
            case 2:
                cardSuit = "S";
                break;
            default:
                cardSuit = "C";
                break;
        }

        cardName = cardFace + cardSuit;

        return cardName;
    }

然后，在for循环中使用它，这样你就可以打印出来或者你需要的东西：

    static void Main(string[] args)
    {
        List<Card> cards = new List<Card>();
        cards.Add(new Card() { Rank = 0, Suit = 0 });
        int numHands = GenerateAllHands(cards);
        int counter = 0;

        Console.WriteLine(numHands);
        Console.WriteLine(possibleHands.Count);

        foreach (Hand hand in possibleHands)
        {
            counter += 1;

            foreach (Card card in hand.Cards)
            {
                hand.HandString += GetCardName(card) + " ";
            }

            hand.HandString = hand.HandString.Trim();
        }

        Console.ReadLine();
    }

Answer 3

这在大约3秒钟内完成为什么要将它们写到文本文件中您可以比从文件中读取的更快地生成它们

    public void PokerHands7from52()
    {
        for (byte i = 0; i < 52; i++)
            Debug.WriteLine("rank " + i % 13 + "  suite " + i / 13);

        Stopwatch sw = new Stopwatch();
        sw.Start();
        int counter = 0;
        for (int i = 51; i >= 6; i--)
        {
            for (int j = i - 1; j >= 5; j--)
            {
                for (int k = j - 1; k >= 4; k--)
                {
                    for (int m = k - 1; m >= 3; m--)
                    {
                        for (int n = m - 1; n >= 2; n--)
                        {
                            for (int p = n - 1; p >= 1; p--)
                            {
                                for (int q = p - 1; q >= 0; q--)
                                {
                                    // the 7 card are i, j, k, m, n, p, q
                                    counter++;
                                    if (counter % 10000000 == 0)
                                        Debug.WriteLine(counter.ToString("N0") + " " + sw.ElapsedMilliseconds.ToString("N0"));
                                }
                            } 
                        }

                    }
                }
            }
        }
        sw.Stop();
        System.Diagnostics.Debug.WriteLine("counter " + counter.ToString("N0") + "  should be 133,784,560");
        System.Diagnostics.Debug.WriteLine("sw " + sw.ElapsedMilliseconds.ToString("N0"));
    }
}

生成扑克牌的所有不同的7张牌组合？

3 个答案: