PTA (daily question) 7-71 character trapezoid

Use from m To n The numeric characters of form a character ladder .

Input format :
First enter a positive integer T, Number of groups representing test data , And then there was T Group test data . Each set of test data input 2 It's an integer m、n（1≤m≤n≤9）.

Output format :
For each group of test data , Output a with n-m+1 Yes , By digital m…n Trapezoidal arrangement , The length of each line is ：m,m+1,m+2,……,n, The numbers in each line are m,m+1,m+2,……,n.

sample input :

1
3 6

sample output :

333
4444
55555
666666

Code ：

# import math
#
# t = int(input())
# for i in range(t):
# m, n = map(int, input().split())
# for i in range(m, n+1):
# result = i
# for j in range(1, i):
# result += i*int(math.pow(10, j))
# print(result)

t = int(input())
for i in range(t):
    m, n = map(int, input().split())
    for i in range(m, n+1):
        result = str(i)
        for j in range(1, i):
            result += str(i)
        print(result)