Longest Palindrome

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*Farzi Coder* wants to give a nice Christmas present to his brother. For that he has brought **N** pairs of letters where each letter is either 'a' or 'b'. So, the possible pairs are "aa", "ab", "ba" or "bb". Now, *Farzi Coder*'s brother loves palindromes. So, he decided to concatenate some of the pairs (possibly all or none) and form a palindrome. He wants the longest such palindrome possible. If

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solution.cppC++17

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