Submission #747573

#	Time	Username	Problem	Language	Result	Execution time	Memory
747573		Nelt	Bosses (BOI16_bosses)	C++17	100 / 100	612 ms	724 KiB

bosses

#pragma GCC optimize("O3,unroll-loops")
#pragma GCC target("avx,avx2,fma")

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>

/* DEFINES */
#define S second
#define F first
#define ll long long
#define ull unsigned long long
#define ld long double
#define npos ULLONG_MAX
#define INF LLONG_MAX
#define vv(a) vector<a>
#define pp(a, b) pair<a, b>
#define pq(a) priority_queue<a>
#define qq(a) queue<a>
#define ss(a) set<a>
#define mm(a, b) map<a, b>
#define ump(a, b) unordered_map<a, b>
#define sync                      \
    ios_base::sync_with_stdio(0); \
    cin.tie(0);                   \
    cout.tie(0);
#define elif else if
#define endl "\n"
#define allc(a) begin(a), end(a)
#define all(a) a, a + sizeof(a) / sizeof(a[0])
#define pb push_back
#define logi(a) __lg(a)
#define sqrt(a) sqrtl(a)
#define mpr make_pair
#define ins insert
using namespace std;
using namespace __gnu_pbds;
using namespace __cxx11;
typedef char chr;
typedef basic_string<chr> str;
template <typename T, typename key = less<T>>
using ordered_set = tree<T, null_type, key, rb_tree_tag, tree_order_statistics_node_update>;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
const ll N = 5005;
vv(ll) g[N];
ll d[N];
void bfs(ll s)
{
    qq(ll) q;
    q.push(s);
    d[s] = 1;
    while (!q.empty())
    {
        ll v = q.front();
        q.pop();
        for (ll to : g[v])
            if (d[to] == -1)
                d[to] = d[v] + 1, q.push(to);
    }
}
void solve()
{
    ll n;
    cin >> n;
    ll ans = INF;
    for (ll i = 1; i <= n; i++)
    {
        ll k;
        cin >> k;
        while (k--)
        {
            ll x;
            cin >> x;
            g[x].pb(i);
        }
    }
    ll cur = 0;
    for (ll i = 1; i <= n; i++)
    {
        for (ll j = 1; j <= n; j++)
            d[j] = -1;
        bfs(i);
        cur = 0;
        for (ll j = 1; j <= n; j++)
            cur += d[j];
        if (!count(d + 1, d + n + 1, -1))
            ans = min(ans, cur);
    }
    cout << ans << endl;
}
/*

*/
int main()
{
    sync
        // precomp();
        ll t = 1;
    // cin >> t;
    for (ll i = 1; i <= t; i++)
        // cout << "Case #" << i << ": ",
        solve();
    cerr << "\nTime elapsed : " << clock() * 1000.0 / CLOCKS_PER_SEC << " ms\n";
}

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