#include "stations.h"
#include <bits/stdc++.h>
using namespace std;
#define N 1000
vector<int> adj[N];
int tin[N];
int tout[N];
int timer = 0;
void dfs(int v,int par){
tin[v] = timer++;
for(auto u:adj[v]){
if(u == par)continue;
dfs(u,v);
}
tout[v] = timer-1;
}
vector<int> label(int n, int k, vector<int> u, vector<int> v) {
vector<int> labels(n);
for (int i = 0; i < n; i++) {
labels[i] = i;
}
return labels;
}
int find_next_station(int s, int t, vector<int> c){
timer = 0;
for(int i = 0;i<N;i++){
adj[i].clear();
}
for(int i = 0;i<N-1;i++){
adj[i+1].push_back(i/2);
adj[i/2].push_back(i+1);
}
timer = 0;
dfs(0,-1);
int x = tin[t];
int par = -1;
for(auto u:c){
if(tin[u] < tin[s])
par = u;
}
for(auto u:c){
if(u == par)continue;
int a = tin[u];
int b = tout[u];
if(a <= x && x <= b)
return u;
}
return par;
}
