Submission #1282529

#	Time	Username	Problem	Language	Result	Execution time	Memory
1282529		lmquan	Bosses (BOI16_bosses)	C++20	100 / 100	466 ms	736 KiB

bosses

#define taskname ""
#include <bits/stdc++.h>
using namespace std;
const long long kInf = 5e18;

int main() {
  if (fopen(taskname".inp", "r")) {
    freopen(taskname".inp", "r", stdin);
    freopen(taskname".out", "w", stdout);
  }
  ios_base::sync_with_stdio(false);
  cin.tie(nullptr);

  int n;
  cin >> n;
  vector<vector<int>> g(n + 1);
  for (int i = 1; i <= n; i++) {
    int k;
    cin >> k;
    for (int j = 1; j <= k; j++) {
      int p;
      cin >> p;
      g[p].push_back(i);
    }
  }

  long long result = kInf;

  for (int i = 1; i <= n; i++) {
    vector<int> d(n + 1, -1);
    queue<int> q;
    q.push(i), d[i] = 1;
    long long s = 1;
    while (!q.empty()) {
      int u = q.front();
      q.pop();
      for (int v : g[u]) {
        if (d[v] == -1) {
          d[v] = d[u] + 1, s += d[v];
          q.push(v);
        }
      }
    }
    bool found = false;
    for (int j = 1; j <= n; j++) {
      if (d[j] == -1) {
        found = true;
        break;
      }
    }
    if (!found) {
      result = min(result, s);
    }
  }

  cout << result;

  return 0;
}

Compilation message (stderr)

bosses.cpp: In function 'int main()':
bosses.cpp:8:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    8 |     freopen(taskname".inp", "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
bosses.cpp:9:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    9 |     freopen(taskname".out", "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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