24 点实现代码

    class Program
    {
        static List<int> sort = new List<int>();
        static int[] intSort = new int[4];
        static int[] array = new int[] { 1, 3, 5, 9 };
        static bool[] arrayBool = new bool[4];//生成 记录表
        static void Main(string[] args)
        {
            for (int j = 0; j < 2; j++)
            {
                random1();
                //24点小游戏
                //step1.生成数的全排
                GenerateAllSort();
                for (int i = 0; i < array.Length; i++)
                {
                    Console.Write(array[i]);
                }
                Console.WriteLine();
                Computer();
            }
            Console.Read();
        }
        private static void random1()
        {
            for (int i = 0; i < array.Length; i++)
            {
                array[i] = GenerateRandomInteger(1, 10);
            }
        }
        /// <summary>
        /// Returns an random interger number within a specified rage
        /// </summary>
        /// <param name="min">Minimum number</param>
        /// <param name="max">Maximum number</param>
        /// <returns>Result</returns>
        public static int GenerateRandomInteger(int min = 0, int max = int.MaxValue)
        {
            var randomNumberBuffer = new byte[10];
            new RNGCryptoServiceProvider().GetBytes(randomNumberBuffer);
            return new Random(BitConverter.ToInt32(randomNumberBuffer, 0)).Next(min, max);
        }
        /// <summary>
        /// 计算24点
        /// </summary>
        private static void Computer()
        {
            string[] comstr = new string[] { "+", "-", "*", "*" };
            int t = 4;
            for (int w = 0; w < sort.Count / 4; w++)
            {
                int pp = w * 4;
                int[] pp1 = new int[4];
                sort.CopyTo(pp, pp1, 0, pp1.Length);
                for (int i = 0; i < t; i++)
                {
                    for (int j = 0; j < t; j++)
                    {
                        for (int q = 0; q < t; q++)
                        {
                            string one = comstr[i];
                            string tow = comstr[j];
                            string three = comstr[q];
                            if (CCC(comstr[q], CCC(comstr[j], CCC(comstr[i], pp1[0], pp1[1]), pp1[2]), pp1[3]) == 24)
                            {
                                Console.Write("找到了:	");
                                Console.WriteLine("((({0}{1}{2}){3}{4}){5}{6})=24", pp1[0], one, pp1[1], tow, pp1[2], three, pp1[3]);
                            }
                        }
                    }
                }
            }
        }
        private static int CCC(string str, int first, int second)
        {
            int result = 0;
            switch (str)
            {
                case "+": result = first + second; break;
                case "-": result = first - second; break;
                case "*": result = first * second; break;
                case "/": result = first / second; break;
            }
            return result;
        }
        private static void GenerateAllSort(int step = 0)
        {
            if (step == 4)
            {
                sort.AddRange(intSort);
                return;
            }
            for (int i = 0; i < 4; i++)
            {
                if (!arrayBool[i])
                {
                    intSort[step] = array[i];
                    arrayBool[i] = true;
                    GenerateAllSort(step + 1);
                    arrayBool[i] = false;
                }
            }

        }
    }