新建一个控制台程序， 规则：相邻两个数进行比较，重复循环判断

        static List<int> list = new List<int>() { 72, 83, 54, 59, 30, 31, 78, 2, 77, 82, 84, 85, 86, 89, 90 };
        static void Main(string[] args)
        {
            int temp = 0;
            for (int i = 0; i < list.Count; i++)
            {
                for (int j = 1; j < list.Count; j++)
                {
                    if (list[j] > list[i])
                    {
                        temp = list[j];
                        list[i] = list[j];
                        list[j] = temp;
                    }
                }
            }
            Console.Write(temp);
            Console.ReadLine();
        }