using System;

using System.Collections.Generic;

using System.Linq;

public class Program

    {

        static string[] PGs = { "song", "roy", "wei", "dazzle", "trista", "tony" };

        static string[] SAs = { "helen", "sandra" ,"lihuei"};

        static string[] QAs = { "candy" };

​

        public static void Main(string[] args)

        {

            string[] All = PGs.Concat(SAs).Concat(QAs).ToArray();

            List<string> Positive = new List<string>();

            List<string> Negative = new List<string>();

​

            bool isMatched = false;

​

            //重複抽、抽到符合規則

            while (!isMatched)

            {

                if (RandomMember(All, ref Positive, ref Negative))

                    isMatched = true;

            }

            var posResult = "正辯方:";

            var negResult = "反辯方:";

            foreach (var item in Positive)

            {

                posResult += item + " ";

            }

            foreach (var item in Negative)

            {

                negResult += item + " ";

            }

            Console.WriteLine(posResult);

            Console.WriteLine(negResult);

        }

​

        /// <summary>

        /// 電腦選土豆，確保至少每組都有PG+SA且人數平均

        /// </summary>

        public static bool RandomMember(string[] allMembers , ref List<string> positive, ref List<string> negative)

        {

            Random ran = new Random();

            positive = new List<string>();

            negative = new List<string>();

            foreach (string s in allMembers)

            {

                var side = ran.Next(2);

                if (side == 0)

                    positive.Add(s);

                else

                    negative.Add(s);

            }

​

            if (positive.Intersect(PGs).Count() > 0 && positive.Intersect(SAs).Count() > 0

                && negative.Intersect(PGs).Count() > 0 && negative.Intersect(SAs).Count() > 0

                && negative.Count()== positive.Count())

                return true;

            else

                return false;

        }

    }