# | Time | Username | Problem | Language | Result | Execution time | Memory |
---|---|---|---|---|---|---|---|
1067456 | Andrey | Newspapers (CEOI21_newspapers) | C++14 | 1 ms | 604 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;
vector<int> haha[10000];
int n,m;
int main()
{
ios_base::sync_with_stdio(false);
cin.tie(NULL);
cout.tie(NULL);
cin >> n >> m;
int a,b;
for(int i = 0; i < m; i++) {
cin >> a >> b;
haha[a].push_back(b);
haha[b].push_back(a);
}
if(m > n-1) {
cout << "NO" << endl;
return 0;
}
vector<int> br(n+1);
for(int i = 1; i <= n; i++) {
br[i] = haha[i].size();
}
for(int i = 1; i <= n; i++) {
if(haha[i].size() == 1) {
br[haha[i][0]]--;
br[i] = -1;
}
}
vector<int> br1(n+1);
for(int i = 1; i <= n; i++) {
br1[i] = br[i];
}
bool yeah = false;
for(int i = 1; i <= n; i++) {
if(br1[i] <= 1 && br1[i] >= 0) {
for(int v: haha[i]) {
br[v]--;
}
br[i] = -1;
}
}
for(int i = 1; i <= n; i++) {
if(br[i] > 2) {
yeah = true;
}
}
if(yeah) {
cout << "NO\n";
}
else {
cout << "YES\n";
if(n == 1) {
cout << 1 << endl << 1 << endl;
return 0;
}
int y = -1;
for(int i = 1; i <= n; i++) {
if(br[i] == 1 || br[i] == 0) {
y = i;
}
}
vector<int> ans(0);
if(y == -1) {
for(int i = 1; i <= n; i++) {
if(br1[i] >= 0) {
ans.push_back(i);
}
}
}
else {
vector<int> wow(0);
while(true) {
wow.push_back(y);
bool yeah = false;
for(int v: haha[y]) {
if(br[v] >= 1 && (wow.size() == 1 || wow[wow.size()-2] != v)) {
y = v;
yeah = true;
break;
}
}
if(!yeah) {
break;
}
}
for(int i = 0; i < wow.size(); i++) {
int a = wow[i];
if(i > 0) {
ans.push_back(a);
}
for(int v: haha[a]) {
if(br1[v] == 1) {
ans.push_back(v);
ans.push_back(a);
}
}
}
ans.pop_back();
}
cout << ans.size()*2 << endl;
for(int i = 0; i < ans.size(); i++) {
cout << ans[i] << " ";
}
if(ans.size()%2) {
for(int i = 0; i < ans.size(); i++) {
cout << ans[i] << " ";
}
}
else {
for(int i = ans.size()-1; i >= 0; i--) {
cout << ans[i] << " ";
}
}
cout << endl;
}
return 0;
}
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