Longest Palindrome from Characters — C# Coding Problem
Difficulty: easy | Category: string
Problem Description
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.
Examples
Example 1
Input: s = "abccccdd"
Output: 7
Explanation: One of the longest palindromes: "dccaccd" (length 7).
Example 2
Input: s = "a"
Output: 1