Submission #448259

#	Time	Username	Problem	Language	Result	Execution time	Memory
448259		JovanB	Bosses (BOI16_bosses)	C++17	100 / 100	783 ms	640 KiB

bosses

#pragma GCC optimize("Ofast")
#pragma GCC target("avx,avx2,fma")
 
#include <bits/stdc++.h>
using namespace std;
 
typedef long long ll;
typedef long double ld;
 
vector <int> graf[5005];
 
int cost;
bool visited[5005];
 
int mk;
 
void bfs(int v){
    visited[v] = true;
    queue <pair <int, int>> q;
    q.push({v, 1});
    while(!q.empty()){
        mk++;
        int x = q.front().first;
        int y = q.front().second;
        cost += y;
        q.pop();
        for(auto c : graf[x]){
            if(!visited[c]){
                visited[c] = 1;
                q.push({c, y+1});
            }
        }
    }
}
 
int main(){
    ios_base::sync_with_stdio(false);
    cout.precision(10);
    cout<<fixed;
 
    int n;
    cin >> n;
    for(int i=1; i<=n; i++){
        int x;
        cin >> x;
        for(int j=1; j<=x; j++){
            int a;
            cin >> a;
            graf[a].push_back(i);
        }
    }
    int mincost = 1000000000;
    for(int i=1; i<=n; i++){
        for(int j=1; j<=n; j++){
            visited[j] = 0;
        }
        cost = 0;
        mk = 0;
        bfs(i);
        if(mk != n) continue;
        mincost = min(mincost, cost);
    }
    cout << mincost << "\n";
    return 0;
}

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