# | Time | Username | Problem | Language | Result | Execution time | Memory |
---|---|---|---|---|---|---|---|
929225 | math_rabbit_1028 | Newspapers (CEOI21_newspapers) | C++14 | 58 ms | 4700 KiB |
This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
using namespace std;
int N, M;
vector<int> adj[1010];
int dep[1010], par[1010], dia[1010];
void DFS(int v, int p=-1) {
for (int i = 0; i < adj[v].size(); i++) {
int u = adj[v][i];
if (u == p) continue;
par[u] = v;
dep[u] = dep[v] + 1;
DFS(u, v);
}
}
int r = 0;
void chk(int v, int p=-1) {
if (r >= 3) {
cout << "NO\n";
exit(0);
}
for (int i = 0; i < adj[v].size(); i++) {
int u = adj[v][i];
if (u == p) continue;
if (dia[u]) continue;
r++;
chk(u, v);
r--;
}
}
int main() {
ios_base::sync_with_stdio(false);
cin.tie(0);
cin >> N >> M;
for (int i = 1; i <= M; i++) {
int a, b;
cin >> a >> b;
adj[a].push_back(b);
adj[b].push_back(a);
}
if (M >= N) {
cout << "NO\n";
return 0;
}
dep[1] = 0;
DFS(1);
int a = 0, b = 0;
for (int i = 1; i <= N; i++) {
if (dep[a] < dep[i]) a = i;
}
dep[a] = 0;
par[a] = 0;
DFS(a);
for (int i = 1; i <= N; i++) {
if (dep[b] < dep[i]) b = i;
}
// cout << a << " " << b << "\n";
int t = b;
while (b > 0) {
dia[b] = 1;
b = par[b];
}
b = t;
for (int i = 1; i <= N; i++) {
if (dia[i]) chk(i);
}
cout << "YES\n";
if (N == 1) cout << "1\n1\n";
else if (N == 2) cout << "2\n1 1\n";
else {
vector<int> ans;
while (b > 0) {
if (b != t && b != a) {
ans.push_back(b);
for (int v : adj[b]) {
if (dia[v]) continue;
if (adj[v].size() > 1) {
ans.push_back(v);
ans.push_back(b);
}
}
}
b = par[b];
}
cout << ans.size()*2 << "\n";
for (int i = 0; i < ans.size(); i++) cout << ans[i] << " ";
reverse(ans.begin(), ans.end());
for (int i = 0; i < ans.size(); i++) cout << ans[i] << " ";
}
return 0;
}
Compilation message (stderr)
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