#include "stations.h"
#include <bits/stdc++.h>
using namespace std;
#define pb push_back
#define sz(a) (int)a.size()
#define all(a) begin(a),end(a)
using ll = long long;
using vi = vector<int>;
const int mxN = 1010;
int dfs_timer = 0;
vi labels, adj[mxN];

void dfs(int s, int p, int dep){
	if(!dep) labels[s] = dfs_timer++;
	else dfs_timer++;
	for(auto u : adj[s])
		if(u!=p) dfs(u,s,dep^1);
	if(dep) labels[s] = dfs_timer++;
	else dfs_timer++;
}

vi label(int n, int k, vi u, vi v) {
	labels.clear(); labels.resize(n,0); dfs_timer=0;
	for(int i = 0; i < n; i++) adj[i].clear();
	for(int i = 0; i < sz(u); i++){
		int a = u[i], b = v[i];
		adj[a].pb(b), adj[b].pb(a);
	}
	dfs(0,-1, 0); return labels;
}

int find_next_station(int s, int t, vi c) {
	if(sz(c)==1) return c[0];
	for(auto u : c) if(u==t) return u;
	if(s < c[0]){
		if(!s or (s<=t and t<=end(c)[-2]+1)){
			for(int i = 1; i < sz(c)-!!s; i++)
				if(c[i-1]+1<=t and t<=c[i]) return c[i];
			return c[0];
		}
		return c.back();
	}
	if(c[1]-1<=t and t<=s){
		for(int i = 1; i < sz(c)-1; i++)
			if(c[i]<=t and t<=c[i+1]-1) return c[i];
		return c.back();
	}
	return c[0];
}