#include "stations.h"
#include <bits/stdc++.h>
#define rep(i,n)for(int i=0;i<int(n);i++)
using namespace std;
typedef long long ll;
static vector<vector<int>>E;
static vector<int>labels;
static int cnt=0;
void dfs(int v,int p){
int L=cnt++;
for(int u:E[v]){
if(u==p)continue;
dfs(u,v);
}
int R=cnt;
labels[v]=L*1001+R;
}
std::vector<int> label(int n, int k, std::vector<int> u, std::vector<int> v){
E=vector<vector<int>>(n);
labels=vector<int>(n);
cnt=0;
rep(i,n-1){
E[u[i]].push_back(v[i]);
E[v[i]].push_back(u[i]);
}
dfs(0,-1);
return labels;
}
int find_next_station(int s, int t, std::vector<int> c) {
int sl=s/1001,sr=s%1001;
int tl=t/1001,tr=t%1001;
for(int u:c){
int ul=u/1001,ur=u%1001;
if(ul<=sl&&sr<=ur)continue;
if(ul<=tl&&tr<=ur)return u;
}
for(int u:c){
int ul=u/1001,ur=u%1001;
if(ul<=sl&&sr<=ur)return u;
}
return -1;
}
