头疼了，大神快来帮我

这个我记得是概率问题0v0 有公式的 但是我不记得了呐

一年多过去了没人帮我

/// <summary>
/// 队员
/// </summary>
class Member
{
public readonly string Name;
public Member(string name)
{
Name = name;
}
//可能的对手
private List<Member> possibleRivals = new List<Member>(3);
public void InitPossibleRivals(Member[] team)
{
possibleRivals.AddRange(team);
if(team.Length == 1)
{
Rival = team[0];
}
}
//public List<Member> PossobleRivals
//{
// get
// {
// return possibleRivals;
// }
//}
//最终对手
private Member rival;
public Member Rival
{
get
{
return rival;
}
set
{
rival = value;
//让可能的对手排除自己
foreach(Member m in possibleRivals)
{
if (m.Name == value.Name) continue;
m.Exclue(this,false);
}
//清理可能的对手列表，只剩下最终对手了
possibleRivals.Clear();
possibleRivals.Add(value);
//你的对手是他，那么他的对手自然就是你了
if(value.Rival == null)
value.Rival = this;
}
}
//排除掉某个对手
public void Exclue(Member other)
{
Exclue(other, true);
}
private void Exclue(Member other,bool flag)
{
if (possibleRivals.Remove(other) && flag)
other.Exclue(this);//你的对手不是他，那么他的对手自然也不会是你
if (possibleRivals.Count == 1 && rival == null)//可能的对手只剩下一个，那么他就是最终对手了
{
Rival = possibleRivals[0];
}
}
}
class Program
{
static void Main(string[] args)
{
Member[] teamJia = new Member[] { new Member("A"), new Member("B"), new Member("C") };
Member[] teamYi = new Member[] { new Member("X"), new Member("Y"), new Member("Z") };
//初始化甲队队员的可能对手名单，为乙队
foreach (Member m in teamJia)
m.InitPossibleRivals(teamYi);
//初始化乙队队员的可能对手名单，为甲队
foreach (Member m in teamYi)
m.InitPossibleRivals(teamJia);
teamJia[0].Exclue(teamYi[0]);//A不和X比
teamJia[2].Exclue(teamYi[0]);//C不和X比
teamJia[2].Exclue(teamYi[2]);//C不和Z比
foreach(Member m in teamJia)
{
Console.WriteLine("{0} VS {1}", m.Name, m.Rival.Name);
}
Console.ReadKey();
}
}