Poj_2239 Selecting Courses -二分图裸题

/************************************************
Author        :DarkTong
Created Time  :2016/7/31 15:38:05
File Name     :Poj_2339.cpp
*************************************************/

//#include <bits/stdc++.h>
#include <cstdio>
#include <cstring>
using namespace std;
#define max(a, b) a>b?a:b
const int maxn = 300+10;
int w[maxn][maxn], Left[maxn], n, m;
bool used[maxn];
bool match(int j)
{
    for(int i=1;i<=n;++i)if(w[i][j]&&!used[i])
    {
        used[i]=true;
        if(!Left[i]||match(Left[i]))
        {
            Left[i]=j;
            return true;
        }
    }
    return false;
}
int hungary()
{
    int res=0;
    memset(Left, 0, sizeof(Left));
    for(int i=1;i<=m;++i)
    {
        memset(used, 0, sizeof(used));
        if(match(i)) res++;
    }
    return res;
}

int main()
{
    int T, cas=1;
    while(scanf("%d", &m)==1)
    {
        memset(w, 0, sizeof(w));

        int p, q, t;
        for(int i=1;i<=m;++i)
        {
            scanf("%d", &t);
            for(int j=1;j<=t;++j)
            {
                scanf("%d%d", &p, &q);
                w[(p-1)*12+q][i]=1;
                n = max((p-1)*12+q, n);
            }
        }
        printf("%d\n", hungary());

    }

    return 0;
}