looool's blog

By looool, 13 years ago, In English

I am not able to send messages, when i am sending it, it is going as blank messages :( Please advice.

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By looool, 13 years ago, In English
can someone explain how to do this problem http://codeforces.me/contest/134/problem/B
i used dfs that resulted in TLE, number theory tag is given at hints, but i am not able to understand how to do it ?

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