[Quick Idea] Longest palindrome

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Describe the idea https://leetcode.com/problems/longest-palindrome/description/

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Post - https://blog.seancoughlin.me/mastering-leetcode-crafting-the-longest-palindrome-from-mixed-letters Write - c5255986977b5f5c627720bec4c532047b4e268b Categorize - 4f93fa4f78c74499b67cef5298c9a36a7ce98966