Submission #953031

#	Time	Username	Problem	Language	Result	Execution time	Memory
953031		Sacharlemagne	Newspapers (CEOI21_newspapers)	C++17	4 / 100	1 ms	456 KiB

newspapers

#include <vector>
#include <iostream>

using namespace std;
int N,k;
vector<int> bad,ans;
bool rec(int node, int cur) {
	if (cur == k) {
		//a.push_back(node);
		return true;
	}
	if (node < 1 || node > N) return false;
	if (ans[cur] == node) return false;
	if (rec(node-1, cur+1)) {
		bad.push_back(node);
		return true;
	}
	if (rec(node+1, cur+1)) {
		bad.push_back(node);
		return true;
	}
	return false;
}
bool ok = true;
void dfs(int par, int node, vector<int> &vis, vector<vector<int>> &adj) {
	vis[node] = 1;
	for (int u : adj[node]) {
		if (u == par) continue;
		if (vis[u] == 0) dfs(node, u, vis, adj);
		if (vis[u] == 1) ok = false;
	}
	vis[node] = 2;
}
int main() {
	ios_base::sync_with_stdio(false); cin.tie(nullptr);
	int n,m,a,b; cin >> n >> m;
	vector<vector<int>> adj(n);
	while (m--) {
		cin >> a >> b;
		adj[--a].push_back(--b);
		adj[b].push_back(a);
	}
	vector<int> vis(n);
	dfs(0,0,vis, adj);
	cout << (ok ? "YES\n1\n1" : "NO");
	return 0;
}

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