제출 #256997

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
256997		rama_pang	Bosses (BOI16_bosses)	C++14	100 / 100	875 ms	760 KiB

bosses

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

int main() {
  ios::sync_with_stdio(0);
  cin.tie(0), cout.tie(0);

  int N;
  cin >> N;
  vector<vector<int>> adj(N);
  for (int i = 0; i < N; i++) {
    int k;
    cin >> k;
    while (k--) {
      int a;
      cin >> a;
      a--;
      adj[a].emplace_back(i);
    }
  }

  auto Solve = [&](int s) -> long long {
    vector<int> dist(N, -1);
    queue<int> q;
    q.emplace(s);
    dist[s] = 0;
    while (!q.empty()) {
      int u = q.front();
      q.pop();
      for (auto v : adj[u]) {
        if (dist[v] == -1) {
          dist[v] = dist[u] + 1;
          q.emplace(v);
        }
      }
    }
    if (count(begin(dist), end(dist), -1) > 0) {
      return 1e18;
    }
    long long ans = 0;
    for (int i = 0; i < N; i++) {
      ans += dist[i] + 1;
    }
    return ans;
  };

  long long ans = 1e18;
  for (int i = 0; i < N; i++) {
    ans = min(ans, Solve(i));
  }
  cout << ans << "\n";
  return 0;
}

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