Submission #1054417

#	Time	Username	Problem	Language	Result	Execution time	Memory
1054417		kunzaZa183	Newspapers (CEOI21_newspapers)	C++17	4 / 100	7 ms	612 KiB

newspapers

#include <bits/stdc++.h>
using namespace std;
int main() {
  cin.tie(0)->sync_with_stdio(0);
  int n, m;
  cin >> n >> m;
  if (m >= n) {
    cout << "NO\n";
    return 0;
  }

  const int maxn = 1000;
  vector<int> adjlist[maxn];
  for (int i = 0; i < m; i++) {
    int a, b;
    cin >> a >> b;
    a--, b--;
    adjlist[a].push_back(b), adjlist[b].push_back(a);
  }

  function<int(int, int)> dfs = [&](int cur, int par) {
    int maxi = 0;
    for (auto a : adjlist[cur])
      if (a != par)
        maxi = max(maxi, dfs(a, cur));
    return maxi + 1;
  };

  for (int i = 0; i < n; i++) {
    vector<int> vi;
    for (auto a : adjlist[i])
      vi.push_back(dfs(a, i));

    int ct = 0;
    for (auto a : vi) {
      if (a >= 3)
        ct++;
    }

    if (ct >= 2 && vi.size() >= 3) {
      cout << "NO\n";
      return 0;
    }
  }

  cout << "YES\n1\n1\n";
}

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