240503 영단어 암기는 괴로워

public static void main(String[] args) throws Exception {
	BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
	StringBuilder sb = new StringBuilder();
	StringTokenizer st = new StringTokenizer(br.readLine());
	
	int n = Integer.parseInt(st.nextToken());
	int m = Integer.parseInt(st.nextToken());
	
	PriorityQueue<Map.Entry<String, Integer>> pq = new PriorityQueue<>(new Comparator<Map.Entry<String, Integer>>() {
		@Override
		public int compare(Map.Entry<String, Integer> o1, Map.Entry<String, Integer> o2) {
			if (o1.getValue() < o2.getValue()) {
				return 1;
			} else if (o1.getValue() > o2.getValue()) {
				return -1;
			}
			else if(o1.getKey().length() < o2.getKey().length()){
				return 1;
			}
			else if(o1.getKey().length() > o2.getKey().length()){
				return -1;
			}
			return o1.getKey().compareTo(o2.getKey());
		}
	});

	Map<String, Integer> words = new HashMap<>();
	for (int i = 0; i < n; i++) {
		String str = br.readLine();
		if (str.length() >= m) {
			words.put(str, words.getOrDefault(str, 0) + 1);
		}
	}

	pq.addAll(words.entrySet());

	while (!pq.isEmpty()) {
		sb.append(pq.poll().getKey()).append('\n');
	}

	System.out.println(sb);
}

출처:https://www.acmicpc.net/problem/20920