#include <bits/stdc++.h>
#include "stations.h"
using namespace std;
vector<int> label(int n, int k, vector<int> u, vector<int> v) {
vector<int> labels(n);
vector <vector<int>> g(n);
for (int i = 0; i < n-1; i++) {
g[u[i]].push_back(v[i]);
g[v[i]].push_back(u[i]);
}
int t = 0;
function<void(int,int,int)> dfs = [&](int x, int p, int d) {
if (d%2) labels[x] = t++;
for (auto to:g[x]) {
if (to != p) dfs(to,x,d+1);
}
int out = t-1;
if (!(d%2)) {
labels[x] = t++;
}
};
dfs(0,0,0);
return labels;
}
int find_next_station(int s, int t, vector<int> c) {
int n = c.size();
if (s <= c[0]) {
for (int i = 0; i < n-1; i++) {
int in = s+1;
int out = c[i];
if (in <= t && t <= out) {
return c[i];
}
}
return c[n-1];
}
for (int i = n-1; i > 0; i--) {
int in = c[i];
int out = s-1;
if (in <= t && t <= out) return c[i];
}
return c[0];
}
