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g0401_0500.s0409_longest_palindrome.readme.md Maven / Gradle / Ivy

409\. Longest Palindrome

Easy

Given a string `s` which consists of lowercase or uppercase letters, return _the length of the **longest palindrome**_ that can be built with those letters.

Letters are **case sensitive**, for example, `"Aa"` is not considered a palindrome here.

**Example 1:**

**Input:** s = "abccccdd"

**Output:** 7

**Explanation:** One longest palindrome that can be built is "dccaccd", whose length is 7.

**Example 2:**

**Input:** s = "a"

**Output:** 1

**Explanation:** The longest palindrome that can be built is "a", whose length is 1.

**Constraints:**

*   `1 <= s.length <= 2000`
*   `s` consists of lowercase **and/or** uppercase English letters only.