Submission #700996

#	Time	Username	Problem	Language	Result	Execution time	Memory
700996		Kahou	Bosses (BOI16_bosses)	C++14	100 / 100	657 ms	680 KiB

bosses

#include<bits/stdc++.h>
using namespace std;
#define F first
#define S second
#define endl '\n'
#define mk make_pair
typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;

const int inf = 1e9 + 50;
const int N = 5e3 + 50;
int n, d[N];
vector<int> adj[N];

void solve(){
	cin >> n;
	for (int u = 1; u <= n; u++) {
		int k;
		cin >> k;
		for (int i = 1; i <= k; i++) {
			int v;
			cin >> v;
			adj[v].push_back(u);
		}
	}
	ll ans = inf;
	queue<int> q;
	for (int s = 1; s <= n; s++) {
		for (int u = 1; u <= n; u++) d[u] = inf;
		d[s] = 1;
		q.push(s);
		while (q.size()) {
			int u = q.front();
			q.pop();
			for (int v:adj[u]) {
				if (d[u]+1 < d[v]) {
					d[v] = d[u]+1;
					q.push(v);
				}
			}
		}
		ll sm = 0;
		for (int u = 1; u <= n; u++) {
			sm += d[u];
		}
		ans = min(ans, sm);
	}
	cout << ans << endl;
}

int main() {
	ios::sync_with_stdio(0), cin.tie(0);
	solve();
	return 0;
}

• Subtask 1: 22 / 22
• Subtask 2: 45 / 45
• Subtask 3: 33 / 33