Submission #329589

#	Time	Username	Problem	Language	Result	Execution time	Memory
329589		gustason	Bosses (BOI16_bosses)	C++14	100 / 100	971 ms	748 KiB

bosses

#include <bits/stdc++.h>
using namespace std;
using ll = long long;

const int maxN = 5005;
const int INF = 1e9 + 5;
int n;
vector<int> adj[maxN];
vector<bool> visited(maxN);

int bfs(int root) {
    for(int i = 0; i <= n; i++) {
        visited[i] = false;
    }

    queue<pair<int, int>> q;
    q.push({root, 1});
    visited[root] = true;

    ll cost = 0;
    while(!q.empty()) {
        auto v = q.front();
        q.pop();
        cost += v.second;

        for(int u : adj[v.first]) {
            if (!visited[u]) {
                visited[u] = true;
                q.push({u, v.second+1});
            }
        }
    }

    if (count(visited.begin(), visited.end(), true) != n) return INF;
    return cost;
}
int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    cin >> n;
    for(int ord = 1; ord <= n; ord++) {
        int k;
        cin >> k;
        for(int j = 0; j < k; j++) {
            int boss;
            cin >> boss;
            adj[boss].push_back(ord);
        }
    }


    int best = INF;
    // root the tree at every possible vertex
    for(int boss = 1; boss <= n; boss++) {
        best = min(best, bfs(boss));
    }

    cout << best;
    return 0;
}

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