一数列笔试题目

说去下面数列的规律，并编程实现：

1

23

312

1231

23123

312312

1231231

大体想了下，应该会有更简洁的算法：

 

代码

public static void Main(string[] args)
        {
            int a=1;
            int b=1;
            
            for(int i=1; i<=7; i++)
            {
                if(b>3)
                {
                    b=1;
                }
                a=b;
                
                for(int j=1; j<=i; j++)
                {
                    
                    if(a>3)
                    {
                        a=1;
                    }
                    Console.Write(a);
                    a++;
                }
                
                b++;
                Console.WriteLine();
            }
            Console.WriteLine("Press any key to continue...");
            Console.ReadKey(true);
        }