FRIENDS OF FRIENDS SPOJ SOLUTION

 "FACEFRND" SPOJ SOLUTION
#include<bits/stdc++.h>
#include<set>
#include<vector>
using namespace std;
int main()
{
 set<int> s;
 vector<int> v;
 int n,i;
 cin>>n;
 while(n--)
{
 int x;
 cin>>x;
 v.push_back(x);
 int m;
 cin>>m;
 while(m--)
  {
  cin>>x;
  s.insert(x);
  }
 }
for(i=0;i<v.size();i++)
s.erase(v[i]);
cout<<s.size();
return 0;
}



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