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Oct 29, 2025
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| ### step1 | ||
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| * 最初、与えられた文字列の substring の中で最長の文字列を返すのかと思って 10 分くらい考えながら書いていた。途中で問題設定が違っているのに気付いたのでやり直し |
| int longestPalindrome(string s) { | ||
| std::unordered_map<char, int> char_to_frequency; | ||
| bool has_odd_frequency = false; | ||
| int palindrome_length = 0; |
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409. Longest Palindrome
https://leetcode.com/problems/longest-palindrome/