集合，ArrayList

            Console.Write("请输入人数：");
            int renshu = int.Parse(Console.ReadLine());
         ArrayList chengji = new ArrayList();
            if (renshu >= 5)
            {
                for (int h = 1; h <= renshu; h++)
                {
                    Console.Write("请输入第" + h + "个人成绩");
                    chengji.Add(int.Parse(Console.ReadLine()));
                }
                chengji.Sort();
                foreach (int a in chengji) 
                {
                    Console.Write(a+" ");
                }
                
                int he = 0;
                for (int i = 0; i <= renshu - 1; i++)
                {
                    he = he + (int)chengji[i];
                }
                double pj = (he - (int)chengji[0] - (int)chengji[1] - (int)chengji[renshu - 2] -(int)chengji[renshu - 1] / (renshu - 4));
                Console.Write("去掉两个最低分"+chengji[0]+"，"+chengji[1]+"去掉两个最高分"+chengji[renshu - 2]+"，"+chengji[renshu - 1]+"最后的成绩是："+pj);

            }
            else
            {
                Console.WriteLine("您输入的人数要大于等于5！！！");
            }
            Console.ReadLine();