I have been solving this problem from past no. of days?

But I have no clue neither I understand the editorial.

https://www.hackerrank.com/challenges/special-multiple/problem

```
You are given an integer N. Can you find the least positive integer X made up of only 9's and 0's, such that, X is a multiple of N?
Update
X is made up of one or more occurences of 9 and zero or more occurences of 0.
Input Format
The first line contains an integer T which denotes the number of test cases. T lines follow.
Each line contains the integer N for which the solution has to be found.
Output Format
Print the answer X to STDOUT corresponding to each test case. The output should not contain any leading zeroes.
Constraints
1 <= T <= 104
1 <= N <= 500
Sample Input
3
5
7
1
Sample Output
90
9009
9
Explanation
90 is the smallest number made up of 9's and 0's divisible by 5. Similarly, you can derive for other cases.
```