Submission #1089945

#	Time	Username	Problem	Language	Result	Execution time	Memory
1089945		Nurislam	Bosses (BOI16_bosses)	C++17	100 / 100	581 ms	824 KiB

bosses

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

#define pb push_back
#define ff first
#define ss second
#define all(x) x.begin(),x.end()
#define rall(x) x.rbegin(),x.rend()
#define int long long


template <class F, class _S>
bool chmin(F &u, const _S &v){
	bool flag = false;
	if ( u > v ){
		u = v; flag |= true;
	}
	return flag;
}

template <class F, class _S>
bool chmax(F &u, const _S &v){
	bool flag = false;
	if ( u < v ){
		u = v; flag |= true;
	}
	return flag;
}

const int N = 1e6+50, inf = 1e9;
//int mod = 998244353
//int mod = 1000000007;
//mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
//#define rnd(l, r) uniform_int_distribution <int> (l, r)(rng)


void solve(){
	int n;cin >> n;
	vector<vector<int>> g(n+1);
	for(int i = 1; i <= n; i++){
		int sz;cin >> sz;
		while(sz--){
			int to;
			cin >> to;
			g[to].pb(i);
		}
	}
	
	int ans = inf;
	auto bfs = [&](int x){
		queue<int> q;q.push(x);
		vector<int> d(n+1, inf);d[x] = 1;
		
		while(q.size()){
			auto ps = q.front();q.pop();
			for(int to:g[ps]){
				if(chmin(d[to], d[ps] + 1)){
					q.push(to);
				}
			}
		}
		
		int res = 0;
		for(int i = 1; i <= n; i++)chmin(res += d[i], inf);
		chmin(ans, res);
	};
	
	for(int i = 1; i <= n; i++)bfs(i);
		
	cout << ans << '\n';
}

 
signed main(){
	ios_base::sync_with_stdio(false);
	cin.tie(nullptr);
	cout.tie(nullptr);
	int tt = 1;
	//cin >> tt;
	while(tt--){
		solve();
	}
}
 
 
 
 
 
 
 
 
 
 
 
 
 

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