[poj] 3041 Asteroids

#include<cstdio>
#include<cstring>
#define N 510
using namespace std;
int edge[N][N],n,m,lover[N],ans;
bool vis[N];

bool find(int x)
{
    for (int i=1;i<=n;i++)
    if (edge[x][i] && !vis[i])
    {
        vis[i]=1;
        if (!lover[i] || find(lover[i]))v
        {
        lover[i]=x;
        return 1;
        }
    }
    return 0;
}

int main()
{
    scanf("%d%d",&n,&m);
    for (int i=1,a,b;i<=m;i++)
    {
    scanf("%d%d",&a,&b);
    edge[a][b]=1;
    }
    for (int i=1;i<=n;i++)
    {
    memset(vis,0,sizeof(vis));
    if (find(i)) ans++;
    }
    printf("%d\n",ans);
    return 0;
}