poj1161

简单的。。。一遍。。。

#include<stdio.h>
#define N 30000+5
int n,m,ans;//n个人，m个团体
int father[N];
int sum[N];

int find_f(int x){
	if(father[x]==x)
		return x;
	else
	{
		father[x]=find_f(father[x]);
	}
	return father[x];
}

void u(int x,int y){
	int fx,fy;
	fx=find_f(x);
	fy=find_f(y);
	if(fx==fy)
		return ;
	if(sum[fx]>=sum[fy]){
		father[fy]=fx;
		sum[fx]+=sum[fy];
	}
	else{
		father[fx]=fy;
		sum[fy]+=sum[fx];
	}
	return ;
}


int main(){
	int i,j,k,t;
	int groupnum,first,next;
	while(scanf("%d%d",&n,&m),n+m){
		for(i=0;i<n;i++){
			father[i]=i;
			sum[i]=1;
		}
		ans=0;

		while(m--){
			scanf("%d",&groupnum);
			scanf("%d",&first);
			for(i=0;i<groupnum-1;i++){
				scanf("%d",&next);
				u(first,next);
			}
		}

		/*for(i=0;i<n;i++){
			if(find_f(i)==find_f(0))
				ans++;
		}

		printf("%d\n",ans);*/
		printf("%d\n",sum[find_f(0)]);//注释里的方法也可以
	}
	return 0;
}

　　

AC