Distances

///By Stephan Ramirez dsramirezc@unal.edu.co
#include<bits/stdc++.h>
#define ms(a,v) memset(a,v,sizeof a)
#define ll long long
#define N 110
using namespace std;
int T;
int n;
vector<int> adj[4][N];
vector<int> adj1[N];
bool vis[N];
int cur=0;
int cnt=0;
int par[N];
void dfs(int node,int parent){
	par[node]=parent;
	for(int i : adj1[node])
		if(i!=parent){
			adj[1][node].push_back(i);
			dfs(i,node);
			for(int j : adj[1][i])
				adj[2][node].push_back(j);
		}
	

}
vector<int> ans;
void sol(int node){
	
	if(vis[node])
		return ;

	ans.push_back(node);
	vis[node]=true;
	for(int i : adj[2][node]){
		sol(i);
	}
	for(int i : adj[1][node]){
		if(adj[1][i].size()==0)
			if(!vis[i]){
				ans.push_back(i);
				vis[i]=true;
				continue;
			}
	}
	sol(par[node]);


}
int main(){
	ios::sync_with_stdio(false); cin.tie(nullptr); cout.tie(nullptr);
	#ifdef LOCAL
		freopen("in.txt","r",stdin);
		//freopen("out.txt","w",stdout)	;
	#endif
	cin>>T;
	while(T--){
		cin>>n;
		for(int i=1;i<=n;i++){
			adj[1][i].clear();
			adj[2][i].clear();
			adj1[i].clear();
			vis[i]=false;
		}		
		for(int i=0;i<n-1;i++){
			int a,b;
			cin>>a>>b;
			adj1[a].push_back(b);
			adj1[b].push_back(a);
		}
		ans.clear();
		vis[0]=true;
		dfs(1,0);	
		sol(1);
		for(int i : ans)
			cout<<i<<" ";
		cout<<'\n';
	}
	return 0;
}

Test 1

Group: 1, 2

Verdict: WRONG ANSWER

Test 2

Group: 2

Verdict: WRONG ANSWER