제출 #1011381

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1011381		MilosMilutinovic	Newspapers (CEOI21_newspapers)	C++14	4 / 100	1 ms	600 KiB

newspapers

#include <bits/stdc++.h>

using namespace std;

int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  int n, m;
  cin >> n >> m;
  vector<vector<int>> g(n);
  for (int i = 0; i < m; i++) {
    int u, v;
    cin >> u >> v;
    --u; --v;
    g[u].push_back(v);
    g[v].push_back(u);
  }
  vector<bool> was(n);
  function<void(int, int)> Dfs = [&](int v, int pv) {
    was[v] = true;
    for (int u : g[v]) {
      if (u == pv) {
        continue;
      }
      if (was[u]) {
        cout << "NO" << '\n';
        exit(0);
      }
      Dfs(u, v);
    }
  };
  for (int i = 0; i < n; i++) {
    if (!was[i]) {
      Dfs(i, i);
    }
  }
  cout << "YES" << '\n';
  if (n == 1) {
    cout << 1 << '\n' << 1 << '\n';
  }
  if (n == 2) {
    cout << 2 << '\n' << 2 << " " << 2 << '\n';
  }
  if (n >= 3) {
    cout << 2 * (n - 2) << '\n';
    for (int i = 2; i < n; i++) {
      cout << i << " " << i << " ";
    }
  }
  return 0;
}

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