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  1. #include <bits/stdc++.h>
  2. #include <unordered_set>
  3. using namespace std;
  4. int main() {
  5.     ios_base::sync_with_stdio(false);
  6.     int t, n;
  7.     cin >> t;
  8.     while (t--) {
  9.         cin >> n;
  10.         unordered_set<int> set, possible, curr;
  11.         int temp = n;
  12.         int x;
  13.         vector<int> p;
  14.         while (temp--) {
  15.             cin >> x;
  16.             p.clear();
  17.             int y;
  18.             for (int i = 0; i < x; i++) {
  19.                 cin >> y;
  20.                 p.push_back(y);
  21.                 set.insert(p[i]);
  22.                 curr.insert(p[i]);
  23.             }
  24.             for (auto itr : set) {
  25.                 if (curr.find(itr) == curr.end()) {
  26.                     possible.insert(itr);
  27.                 }
  28.             }
  29.             curr.clear();
  30.         }
  31.         for (int i = 0; i < x; i++) {
  32.             possible.insert(p[i]);
  33.         }
  34.         int c = 0;
  35.         for (auto itr : possible) {
  36.             if (c == n)
  37.                 break;
  38.             cout << itr << " ";
  39.         }
  40.         cout << endl;
  41.     }
  42.     return 0;
  43. }
  44.  
Success #stdin #stdout 0.01s 5396KB
comments (?)
stdin
copy 
3
3
4
1 2 4 8
3
2 9 1
2
1 4
2
2
1 2
2
2 1
4
4
1 2 3 4
1
1
1
4
1
3
stdout
copy 
1 2 8 9 4 
1 2 
1 2 4 3
https://ideone.com/Y28r2l
language:
C++14 (gcc 8.3)
created:
1 year ago
visibility:
public

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