Submission #943800

#	Time	Username	Problem	Language	Result	Execution time	Memory
943800		phoenix0423	Bosses (BOI16_bosses)	C++17	100 / 100	408 ms	3668 KiB

bosses

#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<ll, ll> pll;
#define fastio ios::sync_with_stdio(false), cin.tie(0)
#pragma GCC optimize("Ofast")
#define pb push_back
#define eb emplace_back
#define f first
#define s second
#define int long long
#define lowbit(x) x&-x
const int INF = 1e18;
const int maxn = 1e5 + 5;
const int N = 1e9 + 7;
vector<int> adj[maxn];
int dep[maxn];

signed main(void){
	fastio;
	int n;
	cin>>n;
	for(int i = 0; i < n; i++){
		int d;
		cin>>d;
		for(int j = 0; j < d; j++){
			int x;
			cin>>x;
			x--;
			adj[x].pb(i);
		}
	}
	int ans = INF;
	for(int i = 0; i < n; i++){
		for(int j = 0; j < n; j++) dep[j] = 0;
		dep[i] = 1;
		queue<int> q;
		q.push(i);
		int cnt = 0, cur = 0;
		while(!q.empty()){
			int pos = q.front(); q.pop();
			cnt++;
			cur += dep[pos];
			for(auto x : adj[pos]){
				if(dep[x]) continue;
				dep[x] = dep[pos] + 1;
				q.push(x);
			}
		}
		if(cnt < n) continue;
		ans = min(ans, cur);
	}
	cout<<ans<<"\n";
}

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