直接模板

#include <iostream>
#include <cstring>
#include <queue>
#include <vector>
#include <map>
#include <cstdio>
#include <stdio.h>
#include <algorithm>
#include <string>
#define N 23541
using namespace std;
int t[305][305];
int girl[305],boy[305];
int visit[305];
int num,p,n,student,istud;
int dfs(int u)
{
    for(int i=1;i<=n;i++)
    {
        if(t[u][i]&&!visit[i])
        {
            visit[i]=1;
            if(boy[i]==0||dfs(boy[i]))
            {
                girl[u]=i;
                boy[i]=u;
                return 1;
            }
        }
    }
    return 0;
}
bool maxmatch()
{
    memset(girl,0,sizeof(girl));
    memset(boy,0,sizeof(boy));
    for(int i=1;i<=p;i++)
    {
        if(girl[i]==0)
        {
            memset(visit,0,sizeof(visit));
            if(dfs(i)==0)
               return false;
        }
    }
    return true;
}
int main()
{

    cin>>num;
    while(num--)
    {
        memset(t,0,sizeof(t));
        cin>>p>>n;
        for(int i=1;i<=p;i++)
        {
            cin>>student;
            while(student--)
            {
                cin>>istud;
                t[i][istud]=1;
            }
        }
        if(maxmatch()) cout<<"YES"<<endl;
        else cout<<"NO"<<endl;
    }
    return 0;
}