Submission #79522

#	Time	Username	Problem	Language	Result	Execution time	Memory
79522		combi1k1	Bosses (BOI16_bosses)	C++14	67 / 100	1567 ms	1120 KiB

bosses

#include<bits/stdc++.h>

using namespace std;

#define int long long
#define X   first
#define Y   second

const int   N   = 5e3 + 1;

vector<int> g[N];
int n, p[N];
int nCh[N];
bool vis[N];

signed main()   {
	ios_base::sync_with_stdio(0);
	cin.tie(0); cout.tie(0);
	
	cin >> n;
	
	for(int i = 1 ; i <= n ; ++i)   {
		int s;  cin >> s;
		while(s--)  {
			int x;  cin >> x;
			g[x].push_back(i);
		}
	}
	
	int ans = 1e18;
	
	for(int i = 1 ; i <= n ; ++i)   {
		memset(vis,0,sizeof vis);
		memset(p,0,sizeof p);
		queue<int>  q;  q.push(i);
		vis[i] = 1;
		while(q.size()) {
			int u = q.front();  q.pop();
			for(int v : g[u])
				if(!vis[v]) {
					p[v] = u;
					q.push(v);
					vis[v] = 1;
				}
		}
		
		bool ch = 1;
		for(int j = 1 ; j <= n ; ++j)   ch &= vis[j];
		if (!ch)    continue;
		
		int cur = 0;
		
		function<void(int)> dfs = [&](int u)    {
			nCh[u] = 1;
			for(int v : g[u])
				if (p[v] == u)  {
					dfs(v);
					nCh[u] += nCh[v];
				}
			cur += nCh[u];
		};  dfs(i);
		
		ans = min(ans,cur);
	}
	
	cout << ans << endl;
}

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