Help with a problem

Revision en1, by nitr0gen, 2020-09-20 17:31:16

Can anyone please explain this problem: https://mirror.codeforces.com/contest/1405/problem/B

The tutorial is so bad explained and I don't get it.

Thanks.

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en1 English nitr0gen 2020-09-20 17:31:16 171 Initial revision (published)