题解 | #查找兄弟单词#

import java.util.*;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        while (in.hasNext()) {
            int size = in.nextInt();
            List<String> list = new ArrayList<>(size);
            for (int i = 0; i < size; i++) {
                list.add(in.next());
            }
            String des = in.next();
            int k = in.nextInt();

            char[] desChars = des.toCharArray();
            Arrays.sort(desChars);//字典排序 方便对比
            for (int i = list.size() - 1; i >= 0; i--) {//倒序遍历，防止删除越界
                String s = list.get(i);
                if (s.equals(des) || s.length() != des.length()) {
                    list.remove(i);
                } else {
                    char[] chars = s.toCharArray();
                    Arrays.sort(chars);
                    if (!Arrays.equals(desChars, chars)) {
                        list.remove(i);
                    }
                }
            }
            System.out.println(list.size());
            if (k >= 1 && k < list.size()) {
                Collections.sort(list);
                System.out.println(list.get(k-1));
            }

        }
    }
}