Submission #927123

#	Time	Username	Problem	Language	Result	Execution time	Memory
927123		pcc	Bosses (BOI16_bosses)	C++14	100 / 100	413 ms	816 KiB

bosses

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

#define ll long long
#define pll pair<ll,ll>
#define pii pair<int,int>
#define fs first
#define sc second
#define tlll tuple<ll,ll,ll>


const int mxn = 5050;
const ll inf = 1e9;
ll dist[mxn];
queue<int> q;
vector<int> paths[mxn];
int N,M;

ll BFS(int s){
	q.push(s);
	fill(dist,dist+N+1,inf);
	dist[s] = 1;
	q.push(s);
	while(!q.empty()){
		auto now = q.front();
		q.pop();
		for(auto nxt:paths[now]){
			if(dist[nxt]>dist[now]+1){
				dist[nxt] = dist[now]+1;
				q.push(nxt);
			}
		}
	}
	return accumulate(dist+1,dist+N+1,0ll);
}

int main(){
	ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
	cin>>N;
	for(int i = 1;i<=N;i++){
		int k;
		cin>>k;
		while(k--){
			int tmp;
			cin>>tmp;
			paths[tmp].push_back(i);
		}
	}
	ll ans = inf*inf;
	for(int i = 1;i<=N;i++)ans = min(ans,BFS(i));
	cout<<ans;
}

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