oj.uz

답안 #576544

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
576544 2022-06-13T07:32:37 Z 8e7 Newspapers (CEOI21_newspapers) C++17
0 / 100
 1 ms 340 KB 
//Challenge: Accepted
#include <bits/stdc++.h>
#pragma GCC optimize("Ofast")
using namespace std;
#ifdef zisk
void debug(){cout << endl;}
template<class T, class ... U> void debug(T a, U ... b){cout << a << " ", debug(b...);}
template<class T> void pary(T l, T r) {
	while (l != r) cout << *l << " ", l++;
	cout << endl;
}
#else
#define debug(...) 0
#define pary(...) 0
#endif
#define ll long long
#define maxn 1005
#define mod 998244353
#define pii pair<int, int>
#define ff first
#define ss second
#define io ios_base::sync_with_stdio(0);cin.tie(0);
vector<int> adj[maxn], g[maxn];

int getdep(int n, int par) {
	int ret = 1;
	for (int v:adj[n]) {
		if (v != par) {
			ret = max(ret, getdep(v, n) + 1);
		}
	}
	return ret;
}

bool path[maxn];
void getpath(int n, int par) {
	path[n] = 1;
	bool to = 0;
	for (int v:g[n]) {
		if (v != par && g[v].size() > 1) {
			getpath(v, n);
			to = 1;
			break;
		}
	}
	if (to == 0) {
		for (int v:g[n]) {
			if (v != par) {
				getpath(v, n);
				break;
			}
		}
	}
}
vector<int> ans;
int last = 0;
void solve(int n, int par) {
	ans.push_back(n);
	last = n;
	for (int v:g[n]) {
		if (v != par && !path[v]) {
			ans.push_back(v);
			ans.push_back(n);
		}
	}
	for (int v:g[n]) {
		if (v != par && path[v]) {
			solve(v, n);
		}
	}
}
int main() {
	io
	int n, m;
	cin >> n >> m;
	for (int i = 0;i < m;i++) {
		int u, v;
		cin >> u >> v;
		adj[u].push_back(v);
		adj[v].push_back(u);
	}
	if (m > n - 1) {
		cout << "NO\n";
		return 0;
	}
	vector<int> nodes;
	for (int i = 1;i <= n;i++) {
		int cnt = 0;
		for (int v:adj[i]) {
			if (getdep(v, i) >= 3) cnt++;
		}
		if (cnt > 2) {
			cout << "NO\n";
			return 0;
		}
		if (adj[i].size() > 1) {
			nodes.push_back(i);
			for (int v:adj[i]) {
				if (adj[v].size() > 1) {
					g[i].push_back(v);
				}
			}
		}
	}	
	cout << "YES\n";
	if (nodes.size() == 0) {
		ans.push_back(1);
		if (n > 1) ans.push_back(1);
	} else if (nodes.size() == 1) {
		ans.push_back(nodes[0]);	
		ans.push_back(nodes[0]);	
	} else {
		if (nodes.size() == 2) {
			getpath(nodes[0], 0), solve(nodes[0], 0);
		} else {
			for (int i:nodes) {
				if (g[i].size() > 1) {
					int cnt = 0;
					for (int v:g[i]) {
						if (g[v].size() > 1) cnt++;
					}
					if (cnt == 1) {
						int ini = i;
						for (int v:g[i]) {
							if (g[v].size() == 1) ini = v;
						}
						getpath(ini, 0);
						solve(ini, 0);
						break;
					}
				}
			}
		}
		solve(last, 0);
	}
	cout << ans.size() << "\n";
	for (int i:ans) cout << i << " ";
	cout << "\n";
}

Subtask #1
0.0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 340 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Incorrect 0 ms 340 KB Integer 0 violates the range [1, 5]
4 Halted 0 ms 0 KB -

Subtask #2
0.0 / 8.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 340 KB Output is correct
2 Correct 0 ms 340 KB Output is correct
3 Correct 0 ms 340 KB Output is correct
4 Correct 0 ms 340 KB Output is correct
5 Incorrect 0 ms 340 KB Integer 0 violates the range [1, 5]
6 Halted 0 ms 0 KB -

Subtask #3
0.0 / 80.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 340 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Incorrect 0 ms 340 KB Integer 0 violates the range [1, 5]
4 Halted 0 ms 0 KB -