Submission #1089925

#	Time	Username	Problem	Language	Result	Execution time	Memory
1089925		Nurislam	Bosses (BOI16_bosses)	C++17	0 / 100	1 ms	348 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;
}

constexpr long double EPS = 1e-12;
const int N = 1e6+50, inf = 1e17;
//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);
		}
	}
	
	vector<int> us(n+5, 0);
	auto bfs = [&](int ps) -> int{
		queue<int> q;
		q.push(ps);
		us[ps] = n+1;
		vector<int> al;
		while(q.size()){
			auto t = q.front();
			q.pop();
			al.pb(t);
			for(int to:g[t]){
				if(us[to])continue;
				us[to] = t;
				q.push(to);
			}
		}reverse(all(al));
		
		int ans = 0;
		vector<int> tot(n+1, 0);
		
		for(int i:al){
			tot[i] ++ ;
			tot[us[i]] += tot[i];
		}
		for(int &i:us)i = 0;
		for(int i = 1; i <= n; i++)ans += tot[i];
		return ans;
	};
	int ans = inf;
	for(int i = 1; i <= n; i++){
		chmin(ans, 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: 0 / 22
• Subtask 2: 0 / 45
• Subtask 3: 0 / 33