POJ 1611 The Suspects

#include <stdio.h>
int a[30005];
int find1(int f)
{
while(a[f]!=f)
{
f=a[f];
}
return f;
}
int main()
{
int n,m;
while(scanf("%d%d",&n,&m),n||m)
{
int i,ans=0;
for(i=0; i<n; i++)
{
a[i]=i;
}
int t,x,y,x1,y1;
for(i=0; i<m; i++)
{
scanf("%d",&t);
scanf("%d",&x);
t--;
while(t--)
{
scanf("%d",&y);
a[find1(y)]=a[find1(x)];
}
}
for(i=0; i<n; i++)
{
int tm=find1(a[0]);
if(find1(a[i])==tm)
{
ans++;
}
}
printf("%d\n",ans);
}
return 0;
}