用了集合，早知道用数组了

import java.util.*;


public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int in = scanner.nextInt();
        List<String> iList = new ArrayList<>();

        for (int j = 0; j < in; j++) {
            iList.add(scanner.next());
        }

        int rn = scanner.nextInt();
        Set<Integer> rSet = new TreeSet<>();

        for (int i = 0; i < rn; i++) {
            // 去重
            rSet.add(scanner.nextInt());
        }

        LinkedHashMap<String, List<Map<Integer, String>>> linkedHashMap = new LinkedHashMap<>();
        Map<String, Integer> countMap = new LinkedHashMap<>();

        int total = 0;

        Iterator<Integer> iterator = rSet.iterator();
        // 遍历R
        while (iterator.hasNext()){
            Integer r = iterator.next();
            int count = 0;

            List<Map<Integer, String>> mapList = new ArrayList<>();
            // 遍历I
            for (int i = 0; i < iList.size(); i++) {
                if (iList.get(i).contains(r + "")) {
                    HashMap<Integer, String> map = new HashMap<>(1);
                    // 添加索引以及对应的数据
                    map.put(i,iList.get(i));
                    mapList.add(map);
                    count++;
                    total += 2;
                }
            }
            if (!mapList.isEmpty()){
                linkedHashMap.put(r + "",mapList);
            }
            // 数字对应在I的出现次数
            if (count > 0){
                countMap.put(r + "",count);
            }
        }
        // R的数量*2相当于有一个是R，有一个是R在I中的次数 + 所有下标加具体数据的数量
        total = countMap.entrySet().size() * 2 + total;

        StringBuilder stringBuilder = new StringBuilder();
        // 遍历统计次数的map
        for (Map.Entry<String, Integer> entry : countMap.entrySet()) {
            String rStr = entry.getKey();
            stringBuilder.append(rStr + " " + entry.getValue() + " ");
            List<Map<Integer, String>> mapList = linkedHashMap.get(rStr);
            for (Map<Integer, String> map : mapList) {
                Map.Entry<Integer, String> next = map.entrySet().iterator().next();
                stringBuilder.append(next.getKey() + " " + next.getValue() + " ");
            }
        }
        // 注意删除末尾的多余空格
        System.out.println(total + " " + stringBuilder.deleteCharAt(stringBuilder.length() - 1));

    }
}