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Discussion of Problem 2018. The Debut Album

what is the meaning of this problem?
Posted by Abbos Bo'kaboyev 21 Nov 2018 16:55
I am not able to understand the problem fully. In the first test  why 221 or 122  are not included. But 212 is included.
If somebody got this problem, please explain
Re: what is the meaning of this problem?
Posted by ViktYusk 24 Nov 2018 19:14
In the example, good albom can't contain two 2 together, because 2 > b = 1.