Submission #673554

#	Time	Username	Problem	Language	Result	Execution time	Memory
673554		quocnguyen1012	Newspapers (CEOI21_newspapers)	C++14	4 / 100	1 ms	340 KiB

newspapers

#include "bits/stdc++.h"

using namespace std;

int main() {
  ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
  
  int N, M; cin >> N >> M;
  vector<vector<int>> adj(N);
  for (int i = 0; i < M; ++i) {
    int u, v; cin >> u >> v;
    --u; --v;
    adj[u].emplace_back(v);
    adj[v].emplace_back(u);
  }

  bool exist_cycle = false;
  vector<bool> visited(N, false);
  auto dfs = [&](auto&dfs, int u, int p) -> void {
    visited[u] = true;
    for (int v : adj[u]) {
      if (v == p) continue;
      if (visited[v]) exist_cycle = true;
      else dfs(dfs, v, u);
    }
  };

  dfs(dfs, 0, -1);
  if (exist_cycle)
    return cout << "NO", 0;

  
  cout << "YES\n" << N << '\n';
  for (int i = 1; i <= N; ++i) cout << i << ' ';
}

• Subtask 1: 0 / 12
• Subtask 2: 4 / 8
• Subtask 3: 0 / 80