undefined_error_'s blog

Yet Another Multiple Problem
By undefined_error_, history, 7 years ago, In English

I am trying to solve it for a while but didn't come up with a efficient idea. Any hints would be great. Problem Link: https://uva.onlinejudge.org/external/16/1653.pdf Thanks :)

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7 years ago, hide # |
 
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You can solve this in O(N) using BFS.

Let your state be (current_mod, has_digit).

Start with state (0, false), and any transition to an allowed digit is ((current_mod * 10 + allowed_digit) % n, true). Iterate on allowed digits in ascending order.

Now you need the minimum path from (0, false) to (0, true).

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