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急需有人帮我看看1611并查集,为什么会超时啊#include<iostream>
using namespace std;
int parent[30001],num[30001],root1,root2;
void set(int i)
{
parent[i]=i;
num[i]=1;
}
int find(int a)
{
if(parent[a]==a) return a;
parent[a]=find(parent[a]);
return parent[a];
}
void uni(int a,int b)
{
root1=find(a);
root2=find(b);
if(root1==root2) return;
if(num[root1]>=num[root2])
{
parent[root2]=root1;
num[root1]+=num[root2];
}
else
{
parent[root1]=root2;
num[root2]+=num[root1];
}
}
int main()
{
int first,next,i,j,m,n,k;
while(1)
{ cin>>m>>n;
if(m+n==0) break;
for(i=0;i<m;i++)
set(i);
for(j=0;j<n;j++)
{
cin>>k;
cin>>first;
for(int z=1;z<k;z++)
{
cin>>next;
uni(first,next);
}
}cout<<num[find(0)];
}
return 0;
}
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