Submission #1039138

#	Time	Username	Problem	Language	Result	Execution time	Memory
1039138		n3rm1n	Political Development (BOI17_politicaldevelopment)	C++17	4 / 100	131 ms	34392 KiB

politicaldevelopment

#include<bits/stdc++.h>
#define endl '\n'
using namespace std;
const int MAXN = 5005;
void speed()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
}
int n, k;
vector < int > g[MAXN];
int m;
int ok = 0, a[MAXN][MAXN];
int used[MAXN];
void dfs(int beg, int p)
{
    used[beg] = 1;
    for (auto nb: g[beg])
    {
        if(used[nb] && a[p][nb] && a[nb][beg])ok = 1;
        if(used[nb])continue;
        dfs(nb, beg);
    }
}
void read()
{
    cin >> n >> k;
    for (int i = 0; i < n; ++ i)
    {
        int cnt;
        cin >> cnt;
        m += cnt;
        while(cnt --)
        {
            int x;
            cin >> x;
            a[i][x] = 1;
            g[i].push_back(x);
        }
    }
    if(k == 1)
    {
        cout << 1 << endl;
        exit(0);
    }
    if(k == 2)
    {
        if(m)cout << 2 << endl;
        else cout << 1 << endl;
        exit(0);
    }
    if(k == 3)
    {
        int ans = 1;
        if(m)ans = 2;
        for (int i = 0; i < n; ++ i)
        {
            memset(used, 0, sizeof(used));
            dfs(i, -1);

        }
        if(ok)ans = 3;
        cout << ans << endl;
    }
}
int main()
{
    speed();

    read();
    return 0;
}

• Subtask 1: 4 / 4
• Subtask 2: 0 / 12
• Subtask 3: 0 / 23
• Subtask 4: 0 / 38
• Subtask 5: 0 / 23