Submission #769134

#	Time	Username	Problem	Language	Result	Execution time	Memory
769134		RushB	Newspapers (CEOI21_newspapers)	C++17	8 / 100	26 ms	572 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], V[N];

void dfs(int v, int p) {
	V[v] = {0};
	for (auto u: adj[v]) if (u != p) {
		dfs(u, v);
		V[v].push_back(V[u][0] + 1);
	}
	sort(V[v].rbegin(), V[v].rend());
}

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);
	}
	FOR(i, 0, n) {
		FOR(j, 0, n) V[j].clear();
		dfs(i, i);
		if (V[i].size() >= 3 && V[i][0] >= 2 && V[i][1] >= 2 && V[i][2] >= 2) {
			assert(0);
			cout << "NO\n";
			return 0;
		}
	}
	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 w

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