Chef with Palindromes

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Nowadays Chef is in love with palindromes. He solved many problems related to palindromes, but he got stuck in one problem while solving .And he wants you to solve this problem now. Given a sequence of letters, how many more would have to be added, at least so that some permutation of this sequence formed a palindrome. You need to determine the minimum number of characters to be inserted in the in

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solution.cppC++17

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