409. Longest Palindrome

Description

Given a string which consists of lowercase or uppercase letters, find the length of the longest palindromes that can be built with those letters.

This is case sensitive, for example "Aa" is not considered a palindrome here.

Note: Assume the length of given string will not exceed 1,010.

Example 1:

Input:
"abccccdd"

Output:
7

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

Tags: Math, String

求2数之和

用哈希表统计每个字符出现的次数判断奇偶性：若字符出现次数为偶数，则肯定能够组成回文串，计入累加器若为奇数，添加个数-1并计入累加器，并且标记存在中心字符

思路2 ```go

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