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| #include<cstdio>
#include<cstring>
using namespace std;
const int maxn=500+10;
struct Max_Match
{
int n;
bool g[maxn][maxn];
bool vis[maxn];
int left[maxn];
void init(int n)
{
this->n=n;
memset(g,0,sizeof(g));
memset(left,-1,sizeof(left));
}
bool match(int u)
{
for(int v=1;v<=n;v++)if(g[u][v] && !vis[v])
{
vis[v]=true;
if(left[v]==-1 || match(left[v]))
{
left[v]=u;
return true;
}
}
return false;
}
int solve()
{
int ans=0;
for(int i=1;i<=n;i++)
{
memset(vis,0,sizeof(vis));
if(match(i)) ans++;
}
return ans;
}
}MM;
int main()
{
int n,k;
scanf("%d%d",&n,&k);
MM.init(n);
while(k--)
{
int u,v;
scanf("%d%d",&u,&v);
MM.g[u][v]=true;
}
printf("%d\n",MM.solve());
return 0;
}
|
