模版-匈牙利算法

模版-匈牙利算法

#include <cstdio>
#include <cstring>
#include <iostream>

const int Maxn = 100005;

struct EDGE {
	int v, next;
} e[Maxn << 2];

int head[Maxn], tot = 1;
bool vis[Maxn];
int p[Maxn];

void add(int u, int v) {
	e[tot].v = v;
	e[tot].next = head[u];
	head[u] = tot++;
}

bool match(int x) {
	for (int i = head[x]; i; i = e[i].next) {
		int v = e[i].v;
		if (!vis[v]) {
			vis[v] = true;
			if (p[v] == 0 || match(p[v])) {
				p[v] = x;
				return true;
			}
		}
	}
	return false;
}

int main() {
	int n, m, ne;
	scanf("%d %d %d", &n, &m, &ne);
	int u, v;
	for (int i = 0; i < ne; i++) {
		scanf("%d %d", &u, &v);
		add(u, v);
	}
	int res = 0;
	for (int i = 1; i <= n; i++) {
		memset(vis, 0,sizeof vis);
		res += match(i);
	}
	printf("%d", res);

​	return 0;

}