ÊýѧÅÅÁÐ×éºÏËã·¨ P(N,M) C(N,M)

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace ConsoleApplication32
{
class Program
{

static int s = 0;
static void Main(string[] args)
{
Console.WriteLine("ÊäÈëÒªÅÅÁеÄÊý×Ö");
string strs = Console.ReadLine();
List<string> list = new List<string>();
int a = 5;
Console.WriteLine("ÊäÈëÒªÅÅÁеĸöÊý");
int b = Int32.Parse(Console.ReadLine());
Compages(strs, "", list, b);
Console.WriteLine("_______________________________________");
for (int i = 0; i < list.Count; i++)
{
Console.WriteLine(list[i]);
}
Console.WriteLine("¹²£º"+s+"¸ö");
Console.Read();
}
/// <summary>
/// ÊýѧÅÅÁÐËã·¨P(N,M)
/// </summary>
/// <param name="num">ÐèÒªÅÅÁеÄ×Ö·û´®</param>
/// <param name="curnum"></param>
/// <param name="list">ÅÅÁгöµÄ×Ö·û´®¼¯ºÏ</param>
/// <param name="n">ÐèÒªÅÅÁеĸöÊý</param>
public static void Compute( string num,string curnum,List<string> list,int n)
{
for (int i = 0; i < num.Length; i++)
{
curnum+= num[i].ToString();
if (curnum.Length == n)
{
list.Add(curnum);
s++;
}
else
{
string temp = num.Remove(i, 1);
Compute(temp,curnum,list,n);
}
curnum = curnum.Remove(curnum.Length - 1, 1);
}
}
/// <summary>
/// Êýѧ×éºÏËã·¨ C(n,m)
/// </summary>
/// <param name="num">Òª×éºÏµ