题解 | #数据分类处理#

import java.util.Scanner;
import java.util.Arrays;
import java.util.Map;
import java.util.HashMap;
import java.util.List;
import java.util.ArrayList;

// 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);
        // 注意 hasNext 和 hasNextLine 的区别
        while (in.hasNext()) { // 注意 while 处理多个 case
            String[] strI = in.nextLine().split(" ");
            int count = in.nextInt();
            Map<Integer, Integer> map = new HashMap<>();
            for (int i = 0; i < count; i++) {
                map.put(in.nextInt(), 0);
            }
            int[] rArray = new int[map.size()];
            int k = 0;
            for (int temp : map.keySet()) {
                rArray[k] = temp;
                k = k + 1;
            }
            Arrays.sort(rArray);
            String[] RArray = new String[map.size()];
            for (int i = 0; i < map.size(); i++) {
                RArray[i] = rArray[i] + "";
            }
            System.out.println(findDate(strI, RArray));
        }
    }
    public static String findDate(String[] strI, String[] rArray) {
        List<List<Integer>> list = new ArrayList<>();
        for (int j = 0; j < rArray.length; j++) {
            List<Integer> tempList = new ArrayList<>();
            tempList.add(j);
            for (int i = 1; i < strI.length; i++) {
                if (strI[i].contains(rArray[j])) {
                    tempList.add(i - 1);
                }
            }
            list.add(tempList);
        }
        StringBuffer sb1 = new StringBuffer();
        int count = 0;
        for (List tempList : list) {
            if (tempList.size() >= 2) {
                String Ri = rArray[(int)tempList.get(0)];
                int count1 =  tempList.size() - 1;
                sb1.append(" ").append(Ri).append(" ").append(count1);
                for (int i = 1; i < tempList.size(); i++) {
                    sb1.append(" ").append((int)tempList.get(i)).append(" ").append(strI[(int)tempList.get(i) + 1]);
                }
                count = count + count1 * 2 + 2;
            }      
        }
        StringBuffer sb = new StringBuffer();
        sb.append(count).append(sb1);
        return sb.toString();
    }
}