Submission #1306200

#	Time	Username	Problem	Language	Result	Execution time	Memory
1306200		thecrazycandy	Political Development (BOI17_politicaldevelopment)	C++20	0 / 100	3105 ms	253120 KiB

politicaldevelopment

#include <bits/stdc++.h>
//#pragma GCC optimize("Ofast")
//#pragma GCC target("avx,avx2,fma")
using namespace std;
#define ll long long
#define sped_up ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
#define rall(v) (v).rbegin(), (v).rend()
#define all(v) (v).begin(), (v).end()
#define pb push_back
#define S second
#define F first
const ll INF = (ll)1e9 + 1, INFL = (ll)1e18 + 1;
const ll mod = (ll)1e9 + 7, MAXN = (ll)5e3 + 1;
vector <ll> g[MAXN];
ll c[MAXN][MAXN];
bool check[MAXN];
bool used[MAXN];
bool nw[MAXN];
void dfs (ll v) {
    ll ok = 1;
    for (auto i : g[v]) {
        if (nw[i]) ok = 0;
    }
    nw[v] = ok;
    used[v] = 1;
    check[v] |= ok;
    for (auto i : g[v]) {
        if (!used[i]) {
            dfs(i);
        }
    }
}
int main() {
    sped_up;
    ll n, k;
    cin >> n >> k;
    ll mx = 0;
    for (int i = 1; i <= n; i++) {
        ll a;
        cin >> a;
        for (int j = 1; j <= a; j++) {
            ll b;
            cin >> b;
            c[i][b + 1] = 1;
        }
    }
    for (int i = 1; i <= n; i++) {
        for (int j = 1; j <= n; j++) {
            if (c[i][j] == 0) g[i].pb(j);
        }
    }
    for (int i = 1; i <= n; i++) {
        if (!check[i]) {
            dfs(i);
            ll cnt = 0;
            for (int j = 1; j <= n; j++) {
                cnt += nw[j];
                used[j] = 0, nw[j] = 0;
            }
            mx = max(mx, cnt);
        }
    }
    cout << mx;
}

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