题解 | #数据分类处理#

import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner fzhinput = new Scanner(System.in);
        int num,sum=0;

        int inum = fzhinput.nextInt();
        ArrayList<String> inumxl = new ArrayList<>();
        for(int i=0; i<inum; i++){
            inumxl.add(fzhinput.next());
        }
        int rnum = fzhinput.nextInt();
        Set<Integer> rset = new HashSet<>();
        for(int i=0; i<rnum; i++){
            rset.add(fzhinput.nextInt());
        }
        ArrayList<Integer> rnumxl = new ArrayList<>(rset);
        Collections.sort(rnumxl);

        ArrayList<String> result = new ArrayList<>();
        
        for(int r : rnumxl){
            ArrayList<String> syandi = new ArrayList<>();
            num=0;
            for(int i=0;i<inumxl.size();i++){
                if(inumxl.get(i).contains(Integer.toString(r))){
                    syandi.add(i+" "+inumxl.get(i));
                    num++;
                }
            }
            if(num>0){
                result.add(r+" "+num);
                result.addAll(syandi);
                sum += 2+syandi.size()*2;
                
            }
        }
        System.out.print(sum+" ");
        for(String sc:result){
            System.out.print(sc+" ");
        }
    }
}