原来ac的代码91分？？？？

#include<iostream>
#include<cstring>
using namespace std;
int n1,n2,m,cnt,sum,e[1001][1001];
int mat[10001],book[10001];
int dfs(int u)
{
    for(int i=1;i<=n2;i++)
    {
        if(book[i]==0&&e[u][i]==1)
        {
            book[i]=1;
            if(mat[i]==0||dfs(mat[i]))
            {
                mat[i]=u;
                return 1;
            }
        }
    }
    return 0;
}
int main()
{
    cin>>n1>>n2>>m;
    for(int i=1;i<=m;i++)
    {
        int t1,t2;
        cin>>t1>>t2;
        if(t2>m||t1>m) continue;
        e[t1][t2]=1;
        e[t2][t1]=1;
    }
    memset(mat,0,sizeof(mat));
    for(int i=1;i<=n1;i++)
    {
        memset(book,0,sizeof(book));
        if(dfs(i)) sum++;
    }
    cout<<sum<<endl;
    return 0;
}