LC1366. Rank Team by Votes

class Solution {
    public String rankTeams(String[] votes) {
        Map<Character, int[]> map = new HashMap();
        int l = votes[0].length();
        for (String v : votes) {
            for (int i = 0; i < l; ++i) {
                map.putIfAbsent(v.charAt(i), new int[l]);
                map.get(v.charAt(i))[i]++;
            }
        }
        
        List<Character> list = new ArrayList<>(map.keySet());
        Collections.sort(list, (a, b) -> {
            for (int i = 0; i < l; ++i) {
                if (map.get(a)[i] != map.get(b)[i]) {
                    return map.get(b)[i] - map.get(a)[i];
                }
            }
            return a - b;
        });
        
        StringBuilder sb = new StringBuilder();
        for (char c : list) {
            sb.append(c);
        }
        
        return sb.toString();
    }
}