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AC代码 500ms#include<cstdio>
#include<iostream>
using namespace std;
const int maxn=31000;
int pre[maxn],a[maxn],num[maxn];
int find(int x)
{
int r=x;
while(r!=pre[r])
r=pre[r];
int i=x,j;
while(pre[i]!=r)
{
j=pre[i];
pre[i]=r;
i=j;
}
return r;
}
void join(int x,int y)
{
int fx=find(x),fy=find(y);
if(fx!=fy)
{
pre[fx]=fy;
num[fy]+=num[fx];
num[fx]=0;
}
}
int main()
{
int n,m,k;
while(~scanf("%d%d",&n,&m),n+m)
{
for(int i=0; i<n; i++)
pre[i]=i,num[i]=1;;
while(m--)
{
scanf("%d",&k);
for(int i=1; i<=k; i++)
{
scanf("%d",&a[i]);
for(int j=1; j<i; j++)
{
join(a[i],a[j]);
}
}
}
printf("%d\n",num[find(0)]);
}
return 0;
}
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