求助一个排列组合的算法问题(在线等,立结贴)

Question

我现在有11个数字,我要任选其中的8个数字做排列组合,两两不相同,现在我要把这8个数字的排列组合全部列举出来,如
0102030405060708,010203040506070809.....1110090807060504,总计有11*10*9*8*7*6*5*4/(1*2*3*4*5*6*7*8)=165种排列组合,求算法

Answer 1

http://www.cnblogs.com/rogerwei/archive/2010/11/18/1880336.html

Answer 2

http://blog.csdn.net/happy09li/article/details/7715858

Answer 3

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;namespace ConsoleApplication1
{
    class Program
    {        static void Main(string[] args)
        {
            foreach (string item in BeginCombo().Select(x => string.Join("", x.Select(y => y.ToString().PadLeft(2, '0')))))
                Console.WriteLine(item);
        }        static IEnumerable<IEnumerable<int>> BeginCombo()
        {
            return Enumerable.Range(1, 11).SelectMany(x => Combo(new int[] { x }, Enumerable.Range(1, 11).Where(y => y > x)));
        }        static IEnumerable<IEnumerable<int>> Combo(IEnumerable<int> current, IEnumerable<int> element)
        {
            if (current.Count() < 8)
                return element.SelectMany(x => Combo(current.Concat(new int[] { x }), Enumerable.Range(1, 11).Where(y => y > x)));
            else
                return new List<IEnumerable<int>> { current };
        }
    }
}0102030405060708
0102030405060709
0102030405060710
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Press any key to continue . . .