#include <bits/stdc++.h>
#include "longesttrip.h"
using namespace std;
#ifndef ONLINE_JUDGE
#define dbg(x) cerr << #x << ' '; print(x); cerr << endl;
#else
#define dbg(x)
#endif
void print(int x) {cerr << x;}
void print(long long x) {cerr << x;}
void print(char x) {cerr << x;}
void print(string x) {cerr << x;}
void print(double x) {cerr << x;}
template <class T> void print(vector <T> x);
template <class T> void print(set <T> x);
template <class T> void print(multiset <T> x);
template <class T, class V> void print(pair <T, V> x);
template <class T, class V> void print(map <T, V> x);
template <class T> void print(vector <T> x) {cerr << "[ "; for(auto i : x) {print(i); cerr << ' ';} cerr << "]";}
template <class T> void print(set <T> x) {cerr << "[ "; for(auto i : x) {print(i); cerr << ' ';} cerr << "]";}
template <class T> void print(multiset <T> x) {cerr << "[ "; for(auto i : x) {print(i); cerr << ' ';} cerr << "]";}
template <class T, class V> void print(pair <T, V> x) {cerr << "{"; print(x.first); cerr << ' '; print(x.second); cerr << "}";}
template <class T, class V> void print(map <T, V> x) {cerr << "[ "; for(auto i : x) {print(i); cerr << ' ';} cerr << "]";}
#define ll long long
#define pb push_back
#define ppb pop_back
#define PII pair <int, int>
#define PLL pair <ll, ll>
#define all(v) (v).begin(), (v).end()
#define OK cerr << "OK\n";
#define MP make_pair
const int N0 = 260;
vector <int> G[N0];
int dist[N0], n, par[N0];
void dfs(int node, int parent, int d){
dist[node] = d;
par[node] = parent;
for(int u : G[node]){
if(u == parent) continue;
dfs(u, node, d + 1);
}
}
void clearh(int n){
for(int i = 0; i < n; i++){
G[i].clear();
}
}
PII find_diameter(){
dfs(0, -1, 0);
int X, mx = -1;
for(int i = 0; i < n; i++){
if(dist[i] > mx){
mx = dist[i];
X = i;
}
}
dfs(X, -1, 0);
int Y;
mx = -1;
for(int i = 0; i < n; i++){
if(dist[i] > mx){
mx = dist[i];
Y = i;
}
}
return {X, Y};
}
vector <int> longest_trip(int N, int D){
clearh(N);
n = N;
int edge_count = 0;
for(int i = 0; i < N; i++){
for(int j = i + 1; j < N; j++){
if(are_connected({i}, {j})){
G[i].pb(j);
G[j].pb(i);
edge_count++;
}
}
}
vector <int> res;
if(edge_count >= N){ //exists a cycle => d = 3
for(int i = 0; i < N; i++) res.pb(i);
return res;
}
PII diam = find_diameter();
int X = diam.first, Y = diam.second;
while(Y != -1){
res.pb(Y);
Y = par[Y];
}
return res;
}
