Solution.java

class Solution {
    public boolean canPermutePalindrome(String s) {
        Map<Character, Integer> cnt = new HashMap<>();
        for (int i = 0; i < s.length(); ++i) {
            cnt.merge(s.charAt(i), 1, Integer::sum);
        }
        int sum = 0;
        for (int v : cnt.values()) {
            sum += v & 1;
        }
        return sum < 2;
    }
}