Which algorithm does INOI 2019 problem 2(Interesing sequences) use?

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What is the basic outline of algorithm to be used in Interesting Sequences, INOI-19 Q.No 2 ? Thanks in advanced :smiley:

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Ever tried searching for the editorial on this forum? Search all topics under editorial category, with inoiprac tag. You may view them here Topics tagged inoiprac

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Thanks man.