#include "stations.h"
#include <bits/stdc++.h>
using namespace std;
template<typename T>
using min_heap = priority_queue<T, vector<T>, greater<T>>;
template<typename T>
using max_heap = priority_queue<T, vector<T>, less<T>>;
using int64 = long long;
using ld = long double;
constexpr int kInf = 1e9 + 10;
constexpr int64 kInf64 = 1e15 + 10;
constexpr int kMod = 1e9 + 7;
vector<int> label(int n, int k, vector<int> u, vector<int> v) {
vector<int> labels(n);
iota(labels.begin(), labels.end(), 0);
return labels;
}
int find_next_station(int s, int t, vector<int> c) {
const int p = (s - 1) / 2;
while (t > 0) {
if ((t - 1) / 2 == s) {
return t;
}
t = (t - 1) / 2;
}
return p;
}
