Chapter 6-1. Use the function to find the sum of special a-string series (10 points)

Given two positive integers a and n not exceeding 9, the function fn (a, n) is required to find the sum of a + aa + aaa ++ ⋯ + aa ⋯ aa (n a), and fn must return the sum of the sequence

Function interface definition:

fn(a,n)
其中 a 和 n 都是用户传入的参数。 a 的值在[1, 9]范围；n 是[1, 9]区间内的个位数。函数须返回级数和 

 

Sample referee test procedure:

/* 请在这里填写答案 */
		 
a,b=input().split()
s=fn(int(a),int(b))
print(s)

 

Sample input:

Here is a set of inputs. E.g:

2 3

 

Sample output:

The corresponding output is given here. E.g:

246

1  # using a special string function evaluation and the number of columns 
2  # the Author: cnRick 
. 3  # Time: 2020-4-10 
. 4  DEF Fn (a, n-):
 . 5      Result = 0
 . 6      str_a = STR (a)
 . 7      for I in Range ( 1, n + 1 ):
 8          result = result + int (str_a * i)
 9      return result