Submission #826962

#	Time	Username	Problem	Language	Result	Execution time	Memory
826962		NeroZein	Newspapers (CEOI21_newspapers)	C++17	0 / 100	1 ms	348 KiB

newspapers

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

#ifdef Nero
#include "Deb.h"
#else
#define deb(...)
#endif

const int N = 1e3 + 3;

vector<int> g[N]; 

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

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