改良版冒泡，暂时没有猜测logN

static void bubble_sort(int[] unsorted)
        {
            for (int i = 0; i < unsorted.Length; i++)
            {
                for (int j = i; j < unsorted.Length; j++)
                {
                    if (unsorted[i] > unsorted[j])
                    {
                        int temp = unsorted[i];
                        unsorted[i] = unsorted[j];
                        unsorted[j] = temp;
                    }
                }
            }
        }

        static void Main(string[] args)
        {
            int[] x = { 6, 2, 4, 1, 5, 9 };
            bubble_sort(x);
            foreach (var item in x)
            {
                Console.WriteLine(item);
            }
            Console.ReadLine();
        }