Submission #262384

#	Time	Username	Problem	Language	Result	Execution time	Memory
262384		Hehehe	Bosses (BOI16_bosses)	C++14	100 / 100	784 ms	1144 KiB

bosses

#include<bits/stdc++.h> //:3
using namespace std;
typedef long long ll;
#define all(a) (a).begin(), (a).end()
#define ff first
#define ss second
#define pb push_back
#define mp make_pair
#define pi pair<long double, long double>
#define sz(x) (int)((x).size())
//#define int long long

const int dx[] = {0, 1, 0, -1};
const int dy[] = {1, 0, -1, 0};

const ll inf = 2e9;
const ll mod = 1e9 + 7;
const int N = 2e4 + 11;
const ll INF64 = 2e9;
const double eps = 1e-14;
const double PI = acos(-1);

//ifstream in(".in");
//ofstream out(".out");

int n, viz[N], d[N];
vector<int>v[N];

int bfs(int x){

    for(int i = 1; i <= n; i++)viz[i] = 0, d[i] = 0;

    d[x] = 1;
    viz[x] = 1;

    queue<int>q;
    q.push(x);

    while(!q.empty()){
        int nod = q.front();
        q.pop();

        for(auto it : v[nod]){
            if(viz[it])continue;
            viz[it] = 1;
            d[it] = d[nod] + 1;
            q.push(it);
        }
    }

    int ans = 0;
    for(int i = 1; i <= n; i++){
        if(!viz[i])return -1;
        ans += d[i];
    }

    return ans;

}

void solve(){

    cin >> n;

    for(int i = 1, k; i <= n; i++){
        cin >> k;
        for(int j = 1, x; j <= k; j++){
            cin >> x;
            v[x].push_back(i);
        }
    }

    int ans = INF64;
    for(int i = 1; i <= n; i++){
        int x = bfs(i);
        if(x != -1)ans = min(ans, x);
    }

    if(ans == INF64){
        cout << "-1" << '\n';
        return;
    }

    cout << ans << '\n';
}



int32_t main(){
ios_base :: sync_with_stdio(0); cin.tie(0); cout.tie(0);

    //cout << setprecision(6) << fixed;

    int T = 1;
    //cin >> T;
    while(T--){
        solve();
    }
}

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