이 제출은 이전 버전의 oj.uz에서 채점하였습니다. 현재는 제출 당시와는 다른 서버에서 채점을 하기 때문에, 다시 제출하면 결과가 달라질 수도 있습니다.
#include<bits/stdc++.h>
using namespace std;
const int maxn=1000+5;
int par[maxn],vis[maxn],len[maxn];
vector<int>adj[maxn];
int n,m;
vector<int>res,resl,resr;
vector<int>fb;
int had;
void solve(int lena=0){
if((int)fb.size()==0){
return ;
}
for(auto x:fb){
len[x]=lena;
vis[x]=1;
}
vector<int>fake;
for(auto x:fb){
for(auto y:adj[x]){
if(vis[y]==1){
continue;
}
else if(lena>0||y!=had){
vis[y]=1;
len[y]=lena+1;
par[y]=x;
fake.push_back(y);
}
}
}
fb.swap(fake);
solve(lena+1);
}
int main(){
ios::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
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);
}
for(int i=1;i<=n;i++){
for(auto x:adj[i]){
if(x>i){
for(int i=0;i<maxn;i++){
par[i]=vis[i]=len[i]=0;
}
fb.clear();
fb.push_back(x);
had=i;
solve();
if(len[i]>2){
int now=i;
while(now>0){
cout<<now<<" ";
now=par[now];
}
return 0;
}
}
}
}
if(res.size()==0){
cout<<"no\n";
}
else{
for(auto x:res){
cout<<x<<" ";
}
cout<<"\n";
}
}
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