Submission #1011359

#	Time	Username	Problem	Language	Result	Execution time	Memory
1011359		MilosMilutinovic	Newspapers (CEOI21_newspapers)	C++14	4 / 100	2 ms	452 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<int> col(n, -1);
  function<void(int)> Dfs = [&](int v) {
    for (int u : g[v]) {
      if (col[u] == -1) {
        col[u] = col[v] ^ 1;
        Dfs(u);
      } else {
        if (col[u] == col[v]) {
          cout << "NO" << '\n';
          exit(0);
        }
      }
    }
  };
  for (int i = 0; i < n; i++) {
    if (col[i] == -1) {
      col[i] = 0;
      Dfs(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