Digit DP - Magic Number

#1

I am not able to understand the use of modulo in this ques. Like how will it maintain the uniqueness ? Or what is the use of m ?

#2

We need that condition na which says divisible by m. Please go through the problem statement again.
https://codeforces.com/problemset/problem/628/D
We are building the number digit by digit and maintaining mod side by side to know if condition is being satisfied or not.

#3

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