Problems
Sets Union
памагити
include <bits/stdc++.h>
using namespace std; int main(){ int n,k,x; cin>>n; set<int>t; for (int i=0;i<n;i++){ cin>>k; for (int j=0;j<k;j++){ cin>>x; t.insert(x); } } cout<<t.size(); }
include <iostream>
include <vector>
include <set>
using namespace std;
int main() { int n; cin>>n; set<int>st; for(int i=0; i<n; i++) { int a; cin>>a; for(int j=0; j<a; j++) { int k; cin>>k; st.insert(k); } }
cout<<st.size();
return 0;
}