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
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
#include <bits/stdc++.h>                                                        
using namespace std;                                                            


int main()
{
    ios_base::sync_with_stdio(0);                                               
    cin.tie(0);                                                                 
    cout.tie(0);     
    
    int k,n, odp;
    vector<vector<int>> spotkania;
    vector<vector<int>> osoby;
    
    odp = 1;
    
    cin>>k>>n;
    spotkania.resize(k+1);
    osoby.resize(k+1);
    spotkania[1].resize(n+1,0);
    spotkania[1][0] = n;
    osoby[1].resize(n+1,0);
    osoby[1][0] = n;
    if (k == 1)
        odp = n;
    else 
    {
        for (int i = 2; i<k+1; i++){
            cin>>n;
            spotkania[i].resize(n+1,-1);
            spotkania[i][0] = n;
            osoby[i].resize(n+1,0);
            osoby[i][0] = n;
            int j = 1;
            
            while (j!=n+1) {
                cin >> spotkania[i][j];
                j++;
            }
        }
    }
        
    /*for (int i = 1;  i < spotkania.size();i++){
        cout<<i<<" |  ";
        for (int j = 0; j< spotkania[i].size(); j++)
            cout<<spotkania[i][j]<<" ";
        cout<<'\n';
    }*/       

    for (int i = osoby.size() -1; i>0; i--){
        int akt_osoby = 0;
        for (int j = 1; j < osoby[i].size();j++){
            int s = spotkania[i][j];
            if ( s != 0){
                if (osoby[i][j] > 0)
                    osoby[i-1][s] += osoby[i][j];
                else
                    osoby[i-1][s] +=  1; 
            }
            if (osoby[i][j] == 0)
                akt_osoby ++;
            else
                akt_osoby +=osoby[i][j];
        }
        if (odp < akt_osoby)
            odp = akt_osoby;
        
    }    
    
    /*
    cout<<'\n'<<"**********   osoby ***********"<<'\n'<<'\n';
    
    for (int i = 1;  i < osoby.size();i++){
        cout<<i<<" |  ";
        for (int j = 0; j< osoby[i].size(); j++)
            cout<<osoby[i][j]<<" ";
        cout<<'\n';
    }
    */
    
    //cout<<'\n'<<"**********   odp   ***********"<<'\n';
    cout<<odp<<'\n';
    
        
    return 0;
}