Easy

Quiz

#409 Longest Palindrome

APPROACH

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.

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.

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What is the optimal approach for this problem?