#include "stations.h"
#include <bits/stdc++.h>
using namespace std;
const int MAXN = 1e3+3;
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;
}
unordered_set<int> getChild(int id){
unordered_set<int> ans, l, r;
ans.insert(id);
if(2*id < 999){
l = getChild(2*id+1);
}
if(2*id < 998){
r = getChild(2*id+2);
}
for(int x : l) ans.insert(x);
for(int x : r) ans.insert(x);
l.clear();
r.clear();
return ans;
}
int find_next_station(int s, int t, vector<int> c){
//menor que eu --> eh meu pai
int pai = 0;
unordered_set<int> fis[1010];
for(int i : c){
if(i < s) pai = i;
else{
fis[i] = getChild(i);
if(fis[i].count(t)){
// cerr << "ta no meu filho" << i << endl;
return i;
}
}
}
return pai;
}
