hdu 2063 匈牙利算法

http://acm.hdu.edu.cn/showproblem.php?pid=2063

男女配对最大数

匈牙利算法模板

#include <cstdio>
#include <cstdlib>
#include <cmath>
#include <cstring>
#include <string>
#include <queue>
#include <map>
#include <iostream>
#include <algorithm>
using namespace std;
#define RD(x) scanf("%d",&x)
#define RD2(x,y) scanf("%d%d",&x,&y)
#define RD3(x,y,z) scanf("%d%d%d",&x,&y,&z)
#define clr0(x) memset(x,0,sizeof(x))
#define eps 1e-9
const double pi = acos(-1.0);
typedef long long LL;
const int modo = 1e9 + 7;
const int maxn = 1005;
int mp[maxn][maxn],link[maxn];
bool used[maxn];
bool find(int x,int n)
{
    for(int i = 0;i <= n;++i){
        if(mp[x][i] && !used[i]){
            used[i] = 1;
            if(!link[i] || find(link[i],n)){
                link[i] = x;
                return true;
            }
        }
    }
    return false;
}
int main() {
    int k,m,n,x,y;
    while(RD3(k,m,n) == 3){
        clr0(mp);
        while(k--){
            RD2(x,y);
            mp[x][y] = 1;
        }
        clr0(used),clr0(link);
        int ans = 0;
        for(int i = 1;i <= m;++i){
            clr0(used);
            if(find(i,n))
                ans++;
        }
        printf("%d\n",ans);
    }

    return 0;
}