Submission #860069

#	Time	Username	Problem	Language	Result	Execution time	Memory
860069		kh0i	Bosses (BOI16_bosses)	C++17	100 / 100	394 ms	856 KiB

bosses

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

#define F first
#define S second
#define sz(x) (int)((x).size())
using ll = long long; 

mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());
ll get_rand(ll l, ll r) {
    assert(l <= r);
    return uniform_int_distribution<ll> (l, r)(rng);
}

#ifdef LOCAL
#include "debug.h"
#else
#define debug(...)
#endif

const int N = 5003;

int n, ans = INT_MAX, d[N];
vector<int> g[N];

void bfs(int st){
    memset(d, -1, sizeof(d));
    d[st] = 1;
    queue<int> q;
    q.push(st);
    while(!q.empty()){
        int u = q.front();
        q.pop();
        for(int v : g[u]){
            if(d[v] == -1){
                d[v] = d[u] + 1;
                q.push(v);
            }
        }
    }
    int tot = 0;
    for(int i = 1; i <= n; ++i){
        if(d[i] == -1)
            return;
        tot += d[i];
    }
    ans = min(ans, tot);
}

void solve(){
    cin >> n;
    for(int i = 1; i <= n; ++i){
        int k, u;
        cin >> k;
        for(int j = 1; j <= k; ++j){
            cin >> u;
            g[u].push_back(i);
        }
    }
    for(int i = 1; i <= n; ++i){
        bfs(i);
    }
    cout << ans;
}


int32_t main() {
    cin.tie(nullptr)->sync_with_stdio(0);
    int test = 1;
//    cin >> test;
    for(int i = 1; i <= test; ++i){
//        cout << "Case #" << i << ": ";
        solve();
    }
    cerr << "\nTime elapsed: " << 1000.0 * clock() / CLOCKS_PER_SEC << " ms.\n";
    return 0;
}

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