Submission #171164

#	Time	Username	Problem	Language	Result	Execution time	Memory
171164		WLZ	Bosses (BOI16_bosses)	C++14	0 / 100	2 ms	376 KiB

bosses

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

const long long INF = (long long) 1e18;

int n;
vector< vector<int> > g;

int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  cin >> n;
  g.resize(n + 1);
  for (int i = 1; i <= n; i++) {
    int k;
    cin >> k;
    while (k--) {
      int p;
      cin >> p;
      g[p].push_back(i);
    }
  }
  long long ans = INF;
  for (int i = 1; i <= n; i++) {
    vector<int> d(n + 1, -1);
    d[i] = 1;
    priority_queue< pair<int, int>, vector< pair<int, int> >, greater< pair<int, int> > > pq;
    long long tmp = 1;
    for (auto& v : g[i]) {
      pq.push({1, v});
    }
    while (!pq.empty()) {
      pair<int, int> cur = pq.top();
      pq.pop();
      if (d[cur.second] != -1) {
        continue;
      }
      d[cur.second] = cur.first + 1;
      tmp += (long long) d[cur.second];
      for (auto& v : g[cur.second]) {
        if (d[v] == -1) {
          pq.push({d[cur.second], v});
        }
      }
    }
    ans = min(ans, tmp);
  }
  cout << ans << '\n';
  return 0; 
}

• Subtask 1: 0 / 22
• Subtask 2: 0 / 45
• Subtask 3: 0 / 33