Submission #973618

#	Time	Username	Problem	Language	Result	Execution time	Memory
973618		Amirreza_Fakhri	Bosses (BOI16_bosses)	C++17	100 / 100	445 ms	856 KiB

bosses

// In the name of the God
#include <bits/stdc++.h>
#define ll long long
// #define int long long
#define pb push_back
#define F first
#define S second
#define mp make_pair
#define pii pair <int, int>
#define smin(x, y) (x) = min((x), (y))
#define smax(x, y) (x) = max((x), (y))
#define all(x) (x).begin(), (x).end()
using namespace std;

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

const int inf = 1e9+7;
const int mod = 998244353;
const int maxn = 5e3+5;

mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

int n, mark[maxn];
vector <int> adj[maxn];
queue <int> q;

int bfs(int r) {
    int sum = 0;
    memset(mark, 0, sizeof mark);
    while (q.size()) q.pop();
    mark[r] = 1;
    q.push(r);
    while (q.size()) {
        int v = q.front();
        q.pop();
        sum += mark[v];
        for (int u : adj[v]) {
            if (!mark[u]) {
                mark[u] = mark[v] + 1;
                q.push(u);
            }
        }
    }
    if (*min_element(mark, mark+n) == 0) return inf;
    return sum;
}

int32_t main() {
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    cin >> n;
    for (int i = 0; i < n; i++) {
        int k; cin >> k;
        while (k--) {
            int j; cin >> j;
            adj[--j].pb(i);
        }
    }
    int ans = inf;
    for (int i = 0; i < n; i++) smin(ans, bfs(i));
    cout << ans << '\n';
    return 0;
}







/*
srand(time(0));
cout << (rand()%1900) + 1 << ' ' << (rand()%2)+5 << '\n';
*/

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