“伯爵说”序列如下：1,11,21,1211,111221, …。其1读作one 1或者11。11读作two 1s或者21。21读作one 2, one 1或者1211。

输入格式

多组输入，读到文件结束。每组输入给定一个整数 n(1≤n≤30)。

输出格式

输出第 n 个序列。注意，整数序列以字符串的形式表示。

样例输入

6
样例输出

312211

花了很长时间做出来，思路一直不对，在网上也没找的很好的解法。思路在下面

try: 
    while True:
        x = int(input())
        A = [1]
        b = 0
        B = []
        C = []
        if x > 1:
            for j in range(x-1):
                for i in A:
                    try:
                        if B[b] == i:
                            C[b] = C[b] + 1
                        else:
                            b = b + 1
                            B.append(i)
                            C.append(1)
                    except SyntaxError:
                        pass
                    except IndexError:
                        B.append(i)
                        C.append(1)
                A = []
                b = 0
                for g, h in zip(C, B):
                    A.append(str(g))
                    A.append(str(h))
                B = []
                C = []
            print("".join(A))
            A = [1]
            b = 0
            B = []
            C = []
        else:
            print('1')
            A = [1]
            b = 0
            B = []
            C = []        
except EOFError:
    pass

做出来后又花了一会时间试着用函数了写出来。

def Ji_Shu(up_list):  # 计数函数，元素存入val__A，次数存入count_A。
    new_val = 0
    val__A = []
    count_A = []
    for i in up_list:
        try:     # 尝试判断新取出的元素是不是和之前的一样，出错就会跳到第二个except。
            if val__A[new_val] == i:  #count_A计相同元素个数
                count_A[new_val] = count_A[new_val] + 1
            else:    #把新元素添加到val__A,并count_A也添加 1
                new_val = new_val + 1
                val__A.append(i)
                count_A.append(1)
        except SyntaxError:  # 暂时没找到能去掉报错这一步的办法
            pass
        except IndexError:     #把新元素添加到val__A,并count_A也添加 1
            val__A.append(i)
            count_A.append(1)
    return val__A, count_A

def Shu_Shu(val__A, count_A):  # 数数函数，结果存入up_list
    up_list = []
    for a, b in zip(count_A, val__A):
        up_list.append(str(a))
        up_list.append(str(b))
    return up_list


def main(): 
    try:  # 判断是否空字符
        while True:
            x = int(input())
            up_list = [1]
            if x == 1:
                print('1')
            else:
                for j in range(x-1):
                    val__A, count_A = Ji_Shu(up_list)
                    up_list = Shu_Shu(val__A, count_A)
                print("".join(up_list))
    except EOFError:
        pass

if __name__ == '__main__':
    main()