Submission #973841

#	Time	Username	Problem	Language	Result	Execution time	Memory
973841		Halym2007	Bosses (BOI16_bosses)	C++17	100 / 100	936 ms	1252 KiB

bosses

#include <bits/stdc++.h>
using namespace std;
const int N = 5e3 + 5;
#define ll long long
#define pb push_back
#define sz size()

ll n, sub[N], vis[N];
vector <int> v[N], p[N];

void solve (int x, int pr) {
	for (int i : p[x]) {
		if (i == pr) continue;
		solve (i, x);
		sub[x] += sub[i];
	}
	sub[x]++;
}


ll root(int x) {
	queue <int> q;
	for (int i = 1; i <= n; ++i) {
		vis[i] = 0;
		sub[i] = 0;
		p[i].clear();
	}
	q.push(x);
	vis[x] = 1;
	while (!q.empty()) {
		int x = q.front();
		q.pop();
		for (int i : v[x]) {
			if (vis[i]) continue;
			p[x].pb (i);
			vis[i] = 1;
			q.push(i);
		}
	}
	for (int i = 1; i <= n; ++i) {
		if (!vis[i]) return -1;
	}
	solve (x, -1);
	ll ret = 0;
	for (int i = 1; i <= n; ++i) {
		ret += sub[i];
	}
	return ret;
}


int main () {
//	freopen ("input.txt", "r", stdin);
	cin >> n;
	for (int i = 1; i <= n; ++i) {
		int k;
		cin >> k;
		while (k--) {
			ll x;
			cin >> x;
			v[x].pb (i);
		}
	}
	ll jog = 1e18;
	for (int i = 1; i <= n; ++i) {
		ll jj = root (i);
		if (~jj) {
			jog = min (jog, jj);
		}
	}
	cout << jog;
}

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