5 打印选课学生名单 (25分)

10 5
ZOE1 2 4 5
ANN0 3 5 2 1
BOB5 5 3 4 2 1 5
JOE4 1 2
JAY9 4 1 2 5 4
FRA8 3 4 2 5
DON2 2 4 5
AMY7 1 5
KAT3 3 5 4 2
LOR6 4 2 4 1 5

1 4
ANN0
BOB5
JAY9
LOR6
2 7
ANN0
BOB5
FRA8
JAY9
JOE4
KAT3
LOR6
3 1
BOB5
4 7
BOB5
DON2
FRA8
JAY9
KAT3
LOR6
ZOE1
5 9
AMY7
ANN0
BOB5
DON2
FRA8
JAY9
KAT3
LOR6
ZOE1

#include<iostream>
#include<algorithm>
#include<vector>
 
using namespace std;
 
int N, K;
vector<string> course[2501];
 
int main(){
	scanf("%d %d", &N, &K);
	for(int i = 0; i < N; i++){
		char name[5];
		scanf("%s", name);
		int C;
		scanf("%d", &C);
		for(int j = 0; j < C; j++){
			int num;
			scanf("%d", &num);
			course[num].push_back(name);
		}
	}
	for(int i = 1; i <= K; i++){
		printf("%d %d\n", i, course[i].size());
		sort(course[i].begin(), course[i].end());
		for(int j = 0; j < course[i].size(); j++){
			printf("%s\n", course[i][j].c_str());
		}
	}
	return 0;
}

#include<iostream>
#include<map>
#include<set>
#include<string>
using namespace std;
int main(){
    int a,b;
    scanf("%d %d",&a,&b);
    map<int,set<string>> mp;
    for(int i=0;i<a;i++){
        char s[5];
        int k;
        int n;
        //s.resize(5);
        scanf("%s",s);
        scanf("%d",&k);
        while(k-->0){
            scanf("%d",&n);
            mp[n].insert(s);
        }
    }
    for(int i=1;i<=b;i++){
        if(mp[i].size()>=0){
            printf("%d %d\n",i,mp[i].size());
            for(auto it = mp[i].begin();it != mp[i].end(); it++){
                //cout<<*it<<endl;
                printf("%s\n",it->c_str());
            }
        }
    }
    return 0;
}