Submission #329759

#	Time	Username	Problem	Language	Result	Execution time	Memory
329759		SuhaibSawalha1	Bosses (BOI16_bosses)	C++17	0 / 100	2 ms	364 KiB

bosses

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

vector<vector<int>> adj;
int vid = 1;
vector<int> visited, dp;

void dfs (int u){
  visited[u] = vid;
  dp[u] = 1;
  for (int v : adj[u]){
    if (visited[v] ^ vid){
      dfs(v);
      dp[u] += dp[v];
    }
  }
} 

int main (){

  #ifndef ONLINE_JUDGE
    freopen("SuhaibSawalha1","r",stdin);
  #endif

  ios_base::sync_with_stdio(false);
  cin.tie(NULL); cout.tie(NULL);

  int n;
  cin >> n;
  adj.resize(n);
  for (int u = 0; u < n; ++u){
    int k, v;
    cin >> k;
    while (k--){
      cin >> v;
      adj[--v].push_back(u);
    }
  }

  visited.resize(n);
  dp.resize(n);
  long long ans = 1e18;
  for (int i = 0; i < n; ++i, ++vid){
    dfs(i);
    ans = min(ans, all_of(visited.begin(), visited.end(), [] (int x) {return x == vid;}) ? accumulate(dp.begin(), dp.end(), 0ll) : (long long) 1e18);
  }
  cout << ans;

  return 0;
}

Compilation message (stderr)

bosses.cpp: In function 'int main()':
bosses.cpp:22:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   22 |     freopen("SuhaibSawalha1","r",stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~

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