1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
#include <bits/stdc++.h>
#define int long long

using namespace std;

signed main(){
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  int k, n_1; cin >> k >> n_1;
  vector<vector<int>> D(k);
  map<int, map<int, int>> D2;
  D[0] = vector<int> (n_1);
  
  for(int i=1; i<k; i++){
    int x; cin >> x;
    D[i] = vector<int> (x);
    for(auto &d : D[i]){
      cin >> d;
      d--;
    }
  }

  int res = 0;
  for(int day = k-1; day>=0; day--){
    int this_day_res=0;
    for(int i=0; i<D[day].size(); i++){
      this_day_res+=max(1LL, D2[day][i]);
      D2[day-1][D[day][i]]+=max(1LL, D2[day][i]);
    }
    res = max(res, this_day_res);
  }
  cout << res << '\n';
}