洗牌算法
private void Permute<T>(List<T> array)
        {
            Random random = new Random();
            for (int i = 1; i < array.Count; i++)
            {
                Swap<T>(array, i, random.Next(0, i));
            }
        }

        private void Swap<T>(List<T> array, int indexA, int indexB)
        {
            T temp = array[indexA];
            array[indexA] = array[indexB];
            array[indexB] = temp;
        }