Python | Leetcode Python题解之第409题最长回文串
题目：
题解：
class Solution:
def longestPalindrome(self, s: str) -> int:
ans = 0
count = collections.Counter(s)
for v in count.values():
ans += v // 2 * 2
if ans % 2 == 0 and v % 2 == 1:
ans += 1
return ans