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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. void solve() {
  5.     int n;
  6.     int m;
  7.     cin >> n >> m;
  8.  
  9.     vector<vector<int>> folders(n);
  10.     vector<int> page_counts(m + 1, 0);
  11.  
  12.     for (int i = 0; i < n; ++i) {
  13.         int li;
  14.         cin >> li;
  15.         folders[i].resize(li);
  16.         for (int j = 0; j < li; ++j) {
  17.             cin >> folders[i][j];
  18.             page_counts[folders[i][j]]++;
  19.         }
  20.     }
  21.  
  22.     for (int i = 1; i <= m; ++i) {
  23.         if (page_counts[i] == 0) {
  24.             cout << "NO" << endl;
  25.             return;
  26.         }
  27.     }
  28.  
  29.     vector<bool> is_essential(n, false);
  30.     for (int i = 0; i < n; ++i) {
  31.         for (int page : folders[i]) {
  32.             if (page_counts[page] == 1) {
  33.                 is_essential[i] = true;
  34.                 break;
  35.             }
  36.         }
  37.     }
  38.  
  39.     vector<bool> pages_covered(m + 1, false);
  40.     int non_essential_count = 0;
  41.     for (int i = 0; i < n; ++i) {
  42.         if (is_essential[i]) {
  43.             for (int page : folders[i]) {
  44.                 pages_covered[page] = true;
  45.             }
  46.         } else {
  47.             non_essential_count++;
  48.         }
  49.     }
  50.  
  51.     for (int i = 1; i <= m; ++i) {
  52.         if (!pages_covered[i]) {
  53.             cout << "NO" << endl;
  54.             return;
  55.         }
  56.     }
  57.  
  58.     if (non_essential_count >= 2) {
  59.         cout << "YES" << endl;
  60.     } else {
  61.         cout << "NO" << endl;
  62.     }
  63. }
  64.  
  65. int main() {
  66.     ios_base::sync_with_stdio(false);
  67.     cin.tie(NULL);
  68.  
  69.     int test_cases;
  70.     cin >> test_cases;
  71.     while (test_cases--) {
  72.         solve();
  73.     }
  74.  
  75.     return 0;
  76. }
Success #stdin #stdout 0.01s 5320KB
comments (?)
stdin 
6
3 2
2 1 2
1 1
1 2
4 10
3 1 2 3
2 4 5
1 6
4 7 8 9 10
2 5
4 1 2 3 4
4 1 2 3 4
5 5
5 1 2 3 4 5
5 1 2 3 4 5
5 1 2 3 4 5
5 1 2 3 4 5
5 1 2 3 4 5
5 10
4 1 2 3 4
5 1 2 5 6 7
5 2 6 7 8 9
4 6 7 8 9
2 9 10
5 5
1 1
1 2
1 3
2 4 5
1 5
stdout 
NO
NO
NO
NO
NO
NO
https://ideone.com/d5WcQB
language:
C++ (gcc 8.3)
created:
15 days ago
visibility:
public

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