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【C#】全排列和组合算法

作者:岸珂 / 发布于2016/9/9/ 673

/// <summary>
/// 对数组进行组合操作，选取selectCount个元素进行组合
/// </summary>
/// <param name="lsArray">即将进行组合操作的数组</param>
/// <param name="selectCount">选取的元素的个数</param>
static void Combination(List<string> lsArray, int selectCount)
{
    int totolcount = lsArray.Count;
    int[] currectselect = new int[selectCount];
    int last = selectCount - 1;
    for (int i = 0; i < selectCount; i++)
    {
        currectselect[i] = i;
    }
    while (true)
    {
        for (int i = 0; i < selectCount; i++)
        {
            Console.Write(" {0} ", lsArray[currectselect[i]]);
        }
        Console.WriteLine();
        if (currectselect[last] < totolcount - 1)
        {
            currectselect[last]++;
        }
        else
        {
            int pos = last;
            while (pos > 0 && currectselect[pos - 1] == currectselect[pos] - 1)
            {
                pos--;
            }
            if (pos == 0) return;
            currectselect[pos - 1]++;
            for (int i = pos; i < selectCount; i++)
            {
                currectselect[i] = currectselect[i - 1] + 1;
            }
        }
    }
}
 排列算法(递归):

/// <summary>
/// 对数组进行全排列
/// </summary>
/// <param name="lsArray">要进行全排列的数组</param>
/// <param name="begin">进行全排列的开始下标</param>
/// <param name="end">进行全排列的结束下标</param>
static void array(List<string> lsArray, int begin, int end)
{
    if (begin == end)
    {
        for (int i = 0; i <= end; i++)
            Console.Write(" {0} ", lsArray[i]);
        Console.WriteLine();
    }
    for (int i = begin; i <= end; i++)
    {
        Swap(lsArray, begin, i);
        array(lsArray, begin + 1, end);
        Swap(lsArray, begin, i);
    }
}
 
/// <summary>
/// 交换数组中的下标为x,y的值
/// </summary>
/// <param name="lsArray">该数组</param>
/// <param name="x"></param>
/// <param name="y"></param>
static void Swap(List<string> lsArray, int x, int y)
{
    string t = lsArray[x];
    lsArray[x] = lsArray[y];
    lsArray[y] = t;
}

试试其它关键字

　全排列　　组合　

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