题解 | #查找兄弟单词#

import java.util.Arrays;
import java.util.Scanner;

// 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.hasNextLine()) {
            String line = in.nextLine();
            print(line);
        }
    }

    private static void print(String line) {
        String[] arr = line.split("\\s+");
        int num = Integer.parseInt(arr[0]);
        int k = Integer.parseInt(arr[arr.length - 1]);
        String x = arr[arr.length - 2];
        String[] arr1 = Arrays.copyOfRange(arr, 1, 1 + num);
        Arrays.sort(arr1);
        int count = 0;
        String res = "";
        for (int i = 0; i < arr1.length; i++) {
            // 长度一致，并且x中的字母在arr[i]中必须都有,且和x不相等
            String s = arr1[i];
            String x1 = sortString(x);

            if (s.length() == x.length() && !x.equals(s)) {
                if (x1.equals(sortString(s)) && ++count == k) {
                    res = s;
                }
            }
        }
        System.out.println(count);
        System.out.println(res);
    }

    private static String sortString(String s) {
        char[] chars = s.toCharArray();
        Arrays.sort(chars);
        return String.valueOf(chars);
    }
}