#include <iostream>
#include <cstdio>
const int maxn = 30000 + 5;
using namespace std;
int father[maxn],rank[maxn];
void init( int n )
{
for ( int i = 0; i < n; i++)
{
father[i] = i;
rank[i] = 1;
}
}
int findSet( int n )
{
if(father[n] != n)
father[n] = findSet(father[n]);
return father[n];
}
void Union( int a, int b )
{
int x = findSet( a );
int y = findSet( b );
if( x == y ) return ;
if( rank[x] >= rank[y] )
{
father[y] = x;
rank[x] += rank[y];
}
else
{
father[x] = y;
rank[y] += rank[x];
}
}
int main()
{
int m, n, count, temp, first;
while( ~scanf("%d%d", &n, &m ) && n )
{
init(n);
while( m-- )
{
scanf("%d%d", &count, &first );
for( int i = 1; i < count ;i ++)
{
scanf("%d", &temp);
Union( first, temp );
}
}
printf("%d\n",rank[findSet(0)]);
}
return 0;
}
posted on 2010-07-29 07:09
Vontroy 阅读(222)
评论(0) 编辑 收藏 引用 所属分类:
并查集 、
POJ