제출 #897441

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
897441		NeroZein	Newspapers (CEOI21_newspapers)	C++17	4 / 100	2 ms	5212 KiB

newspapers

#include "bits/stdc++.h"
using namespace std;
 
#ifdef Nero
#include "Deb.h"
#else
#define deb(...)
#endif
 
const int N = 2e5 + 5;
 
int a, b; 
int dep[N];
vector<int> g[N];

void dfs(int v, int p, int& x) {
  if (dep[v] >= dep[x]) {
    x = v;
  }
  for (int u : g[v]) {
    if (u == p) continue;
    dep[u] = dep[v] + 1; 
    dfs(u, v, x); 
  }
}
 
int main() {
  ios::sync_with_stdio(false);
  cin.tie(nullptr);
  int n, m;
  cin >> n >> m;
  int mxdegree = 0; 
  for(int i = 0; i < m; ++i) {
    int u, v;
    cin >> u >> v;
    g[u].push_back(v);
    g[v].push_back(u);
    mxdegree = max(mxdegree, (int) g[v].size());
    mxdegree = max(mxdegree, (int) g[u].size());
  } 
  dfs(1, 1, a);
  dfs(a, a, b);
  if (mxdegree >= 3 && dep[b] > 4) {
    cout << "NO" << '\n';
    return 0; 
  }
  cout << "YES" << '\n';
  cout << 1 << '\n'; 
  cout << 1 << '\n';
  return 0;
}

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