10分でコーディング

[どうでもよいこと]10分コーディング | Ryuzee.com
１０分でコーディング｜プログラミングに自信があるやつこい！！


問題読むのに2分ちょい、問題解くのに5分ちょいでした。

⊂（＾ω＾）⊃ ｾﾌｾﾌ!!

class Cards
{
    public string[] Deal(int numPlayers, string deck)
    {
        int count = deck.Length - deck.Length % numPlayers;
        string[] result = new string[numPlayers];

        for (int i = 0; i < numPlayers; i++)
        {
            result[i] = string.Empty;
        }

        int playerIndex = 0;
        for (int i = 0; i < count; i++)
        {
            result[playerIndex] += deck[i];
            playerIndex++;
            if (numPlayers == playerIndex)
            {
                playerIndex = 0;
            }
        }
        return result;
    }
}


終了後に、リファクタリングもしてみました。
yield return による、順序のオブジェクト化が面白いかもです。

class Cards
{
    public string[] Deal(int numPlayers, string deck)
    {
        string trimmedDeck = this.TrimDeck(deck, numPlayers);
        string[] hands = this.CreateInitialHands(numPlayers);

        IEnumerator<int> order = this.CreateDealOrder(numPlayers);
        foreach (char card in trimmedDeck)
        {
            order.MoveNext();
            hands[order.Current] += card;
        }
        return hands;
    }

    private string TrimDeck(string deck, int numPlayers)
    {
        int needlessCount = deck.Length % numPlayers;
        int needCount = deck.Length - needlessCount;
        return deck.Substring(0, needCount);
    }

    private string[] CreateInitialHands(int numPlayers)
    {
        string[] hands = new string[numPlayers];
        for (int i = 0; i < numPlayers; i++)
        {
            hands[i] = string.Empty;
        }
        return hands;
    }

    private IEnumerator<int> CreateDealOrder(int numPlayers)
    {
        const int startIndex = 0;
        int currentIndex = startIndex;
        while (true)
        {
            yield return currentIndex;

            int incrementedIndex = currentIndex + 1;
            currentIndex = (incrementedIndex < numPlayers) ? incrementedIndex : startIndex;
        }
    }
}
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