Submission #769061

#	Time	Username	Problem	Language	Result	Execution time	Memory
769061		RushB	Newspapers (CEOI21_newspapers)	C++17	8 / 100	1 ms	340 KiB

newspapers

#include "bits/stdc++.h"
#define int long long
#define FOR(i, a, b) for (int i = (a); i < (b); i++)
using namespace std;
const long long INF = 1ll << 60;
const int N = 1000 + 5;
vector<int> adj[N];

void dfs(int v) {
	int ch = 0;
	for (auto u: adj[v]) {
		adj[u].erase(find(adj[u].begin(), adj[u].end(), v));
		dfs(u);
		if (adj[u].size()) ch++;
	}
	if (ch >= 2) {
		cout << "NO\n";
		exit(0);
	}
}

signed main() {
	ios::sync_with_stdio(0), cin.tie(0);
	int n, m;
	cin >> n >> m;
	if (m >= n) {
		cout << "NO\n";
		return 0;
	}
	if (n <= 2) {
		cout << "YES\n";
		cout << n << '\n';
		FOR(i, 0, n) cout << 1 << ' ';
		return 0;
	}
	FOR(i, 1, n) {
		int u, v; cin >> u >> v;	
		u--, v--;
		adj[u].push_back(v);
		adj[v].push_back(u);
	}
	int rt = 0;
	FOR(i, 0, n) if (adj[i].size() == 1) rt = i;
	dfs(rt);
	cout << "YES\n";
	cout << 2 * n - 4 << '\n';
	FOR(i, 1, n - 1) cout << i + 1 << ' ';
	FOR(i, 1, n - 1) cout << n - i << ' ';
	cout << '\n';
	return 0;
}
//Reading this fills you with DETERMINATION
//20:06:46

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