学步园

#include <cstdio>
#include <cstring>
#include <iostream>
using namespace std;
#define MAX 1001
int Map[MAX][MAX];//图
int link[MAX];//匹配
int vis[MAX];//标记
int m;
int dfs(int x){
    for(int i = 0;i < m;i++){
        if(Map[x][i] && vis[i] == 0){
            vis[i] = 1;
            if(link[i] == -1 || dfs(link[i])){
                link[i] = x;
                return 1;
            }
        }
    }
    return 0;
}
int main(){
    int k,stu,num;
    char a,b,c;
    while(~scanf("%d",&m)){
        memset(Map,0,sizeof(Map));
        memset(link,-1,sizeof(link));
        for(int i = 0;i < m;i++){
            scanf("%d: (%d)",&num,&k);
            for(int j = 0;j < k;j++){
                scanf("%d",&stu);
                Map[num][stu] = 1;
            }
        }
        /*for(int i = 0;i < m;i++){
            for(int j = 0;j < m;j++)
                cout<<Map[i][j];
            cout<<endl;
        }*/
        int ans = 0;
        for(int i = 0;i < m;i++){
            memset(vis,0,sizeof(vis));
            if(dfs(i)) ans++;
        }
        printf("%d\n",m - ans / 2);
    }
    return 0;
}