Chef and the Cards

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There are N cards placed in a row, where every card has two numbers written on it, one on the top and one on the bottom. The numbers are between 1 and N (both inclusive). Every number is written on the top of exactly one card, and on the bottom of exactly one card as well. Chef wants to rearrange the cards, such that the length of the longest common contiguous subsequence between the sequence for

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solution.cppC++17

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