【1】1047 Student List for Course（25 分）

思路：無

#include<cstdio>
#include<iostream>
#include<algorithm>
#include<vector>
#include<cstring>
#define MAX1 40001
#define MAX2 2501
using namespace std;
char name[MAX1][5];
vector<int> cr[MAX2];
bool cmp(int a,int b){
	return strcmp(name[a],name[b])<0;
}
int main()
{
	int N,K,m,nb;
	scanf("%d%d",&N,&K);
	for(int i=0;i<N;i++){
		scanf("%s%d",name[i],&m);
		for(int j=0;j<m;j++){
			scanf("%d",&nb);
			cr[nb].push_back(i);
		}
	}
	for(int i=1;i<=K;i++){
		printf("%d %d\n",i,cr[i].size());
		sort(cr[i].begin(),cr[i].end(),cmp);
		for(int j=0;j<cr[i].size();j++) printf("%s\n",name[cr[i][j]]);
	}
	return 0;
 }