Submission #46546

#	Time	Username	Problem	Language	Result	Execution time	Memory
46546		ista2000	Bosses (BOI16_bosses)	C++17	67 / 100	1575 ms	1856 KiB

bosses

#include <bits/stdc++.h>
using namespace std;
#define int long long int

vector< vector<int> > v, g;
vector<int> a;
int n;

void dfs(int u, int p)
{
	a[u] = 1;
	for(int i: g[u])
		if(i!=p)
			dfs(i, u), a[u]+=a[i];
}

int bfs(int r)
{
	queue< pair<int, int> > q;
	q.push(make_pair(r, r));
	g.clear();
	g.resize(n);
	a.clear();
	a.resize(n);
	vector<int> vis(n);
	while(!q.empty())
	{
		int cur = q.front().first;
		int curp = q.front().second;
		q.pop();
		if(vis[cur])continue;
		vis[cur] = 1;
		g[cur].push_back(curp);
		g[curp].push_back(cur);
		for(int i: v[cur])
			q.push(make_pair(i, cur));
	}
	bool done = true;
	for(int i = 0;i<n;i++)
		if(!vis[i])
			done = false;
	if(!done)return INT_MAX;
	dfs(r, r);
	return accumulate(a.begin(), a.end(), 0ll);
}

#undef int
int main()
{
#define int long long int
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);

	cin>>n;
	v.resize(n);
	for(int i = 0;i<n;i++)
	{
		int k;
		cin>>k;
		for(int j = 0;j<k;j++)
		{
			int x;
			cin>>x;
			x--;
			v[x].push_back(i);
		}
	}
	int ans = INT_MAX;
	for(int i = 0;i<n;i++)
		ans = min(ans, bfs(i));
	cout<<ans<<endl;

	return 0;
}

• Subtask 1: 22 / 22
• Subtask 2: 45 / 45
• Subtask 3: 0 / 33