算是补档？
cogs14裸二分图模板

#include <iostream>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <algorithm>
#include <vector>
#include <queue>

using namespace std;
const int maxn=200;

vector<int > g[maxn];
void addedge(int from,int to)
{
    g[from].push_back(to);
    g[to].push_back(from);
}
int match[maxn];
bool book[maxn];

bool dfs(int v)
{
    //本身的结点不标为true
    for(unsigned i=0;i<g[v].size();i++)
    {
        int u=g[v][i];
        if(book[u]==false)
        {
            book[u]=true;
            if(match[u]==0 || dfs(match[u]))
            {
                match[u]=v;
                match[v]=u;
                return true;
            }
        }
    }
    return false;
}

int main()
{
    freopen("flyer.in","r",stdin);
    freopen("flyer.out","w",stdout);
    int n,m;
    scanf("%d%d",&n,&m);
    int from;
    int to;
    while(scanf("%d%d",&from,&to)==2)
    {
        addedge(from,to);
    }
    int ans=0;
    for(int i=1;i<=n;i++)
    {
        if(match[i]==0)
        {
            memset(book,0,sizeof(book));
            if(dfs(i))
            {
                ans++;
            }
        }
    }
    printf("%d\n",ans);
    return 0;
}