解法：简单语法题

package com.sky;import java.util.*;public class Test1 {public static void main(String[] args) {Scanner sc = new Scanner(System.in);int N = sc.nextInt();int M = sc.nextInt();List<String> words = new ArrayList<>(N);for (int i = 0; i < N; i++) {String word = sc.next();words.add(word);}Comparator<String> customComparator = (s1, s2) -> {boolean s1Contains = s1.contains("PDD");boolean s2Contains = s2.contains("PDD");if (s1Contains && !s2Contains) {return -1;} else if (!s1Contains && s2Contains) {return 1;} else {return s1.compareTo(s2);}};Collections.sort(words, customComparator);for (int i = 0; i < M; i++) {System.out.println(words.get(i));}}
}