Submission #283427

#	Time	Username	Problem	Language	Result	Execution time	Memory
283427		YJU	Bosses (BOI16_bosses)	C++14	100 / 100	804 ms	784 KiB

bosses

#include<bits/stdc++.h>
#pragma GCC optimize("unroll-loops,no-stack-protector")
using namespace std;
typedef long long ll;
typedef long double ld;
typedef pair<ll,ll> pll;
const ll MOD=1e9+7;
const ll MOD2=998244353;
const ll N=5e3+5;
const ld pi=3.14159265359;
const ll INF=(1LL<<60);
#define SQ(i) ((i)*(i))
#define REP(i,n) for(ll i=0;i<n;i++)
#define REP1(i,n) for(ll i=1;i<=n;i++)
#define pb push_back
#define mp make_pair
#define X first
#define Y second
#define setp setprecision
#define lwb lower_bound
#define SZ(_a) (ll)_a.size()

ll n,x,ans=INF,tmp,d[N],t;
queue<ll> q;
vector<ll> v[N];

ll f(ll id){
	memset(d,-1,sizeof(d));
	d[id]=tmp=0;
	q.push(id);
	while(SZ(q)){
		x=q.front();
		q.pop();
		tmp+=d[x];
		for(ll i:v[x]){
			if(d[i]==-1){
				d[i]=d[x]+1;
				q.push(i);
			}
		}
	}
	REP1(i,n)if(d[i]==-1)return INF;
	return tmp+n;
}

int main(){
	ios_base::sync_with_stdio(0);cin.tie(0);	
	cin>>n;
	REP1(i,n){
		cin>>t;
		while(t--)cin>>x,v[x].pb(i);
	}
	REP1(i,n)ans=min(ans,f(i));
	cout<<ans<<"\n";
	return 0;
}

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