Submission #634755

#	Time	Username	Problem	Language	Result	Execution time	Memory
634755		tvladm2009	Bosses (BOI16_bosses)	C++14	100 / 100	594 ms	672 KiB

bosses

#include <iostream>
#include <vector>
#include <queue>
#include <string.h>
#define int long long

using namespace std;

const int MAX_N = 5 * 1e3;
const int INF = (1LL << 60);
int dist[MAX_N + 1];
vector<int> g[MAX_N + 1];
int n;

int bfs(int start) {
    memset(dist, 0, sizeof(dist));
    queue<int> q;
    q.push(start);
    dist[start] = 1;
    int cost = 1;
    while (!q.empty()) {
        int u = q.front();
        q.pop();
        for (int v : g[u]) {
            if (!dist[v]) {
                dist[v] = dist[u] + 1;
                cost += dist[v];
                q.push(v);
            }
        }
    }
    for (int i = 1; i <= n; i++) {
        if (!dist[i]) {
            return INF;
        }
    }
    return cost;
}

signed main() {
    cin >> n;
    for (int i = 1; i <= n; i++) {
        int k;
        cin >> k;
        for (int j = 1; j <= k; j++) {
            int x;
            cin >> x;
            g[x].push_back(i);
        }
    }
    int answer = INF;
    for (int i = 1; i <= n; i++) {
        answer = min(answer, bfs(i));
    }
    cout << answer;
    return 0;
}

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