#include<bits/stdc++.h>
#include <vector>
using namespace std;
const int N=1005;
bool check(int a,int b) {
if(b<a) {
return false;
}
if(b>>(__builtin_clz(a)-__builtin_clz(b))==a) {
return true;
}
return false;
}
int a[N]={};vector<int>wss[N];
void dfs(int node,int past,int cnt) {
a[node]=cnt;
vector<int>v={2*cnt+1,2*cnt};
for(int i:wss[node]) {
if(i!=past) {
dfs(i,node,v.back());
v.pop_back();
}
}
}
std::vector<int> label(int n, int k, std::vector<int> u, std::vector<int> v) {
int cnt[N]={};
std::vector<int> labels(n);
for (int i = 0; i < n-1; i++) {
wss[u[i]].push_back(v[i]);
wss[v[i]].push_back(u[i]);
cnt[u[i]]++;
cnt[v[i]]++;
}
for(int i=0;i<n;i++) {
labels[i]=i+1;
}
for(int i=0;i<n;i++) {
wss[i].clear();
a[i]=0;
}
return labels;
}
int find_next_station(int s, int t, std::vector<int> c) {
if(c.size()>=2&&check(c[c.size()-2],t)){
return c[c.size()-2];
}
if(c.size()>=1&&check(c[c.size()-1],t)){
return c[c.size()-1];
}
return c[0];
}
