#include "stations.h"
#include <bits/stdc++.h>
using namespace std;
vector<int> label(int n, int k, vector<int> u, vector<int> v) {
vector<vector<int>> adj(n);
for (int i = 0; i < n - 1; i++) {
adj[u[i]].push_back(v[i]);
adj[v[i]].push_back(u[i]);
}
int cnt = 0;
vector<int> ans(n);
function<void(int, int, int)> dfs = [&](int a, int c, int d) {
if (d == 0) {
ans[a] = cnt++;
}
for (int b : adj[a]) {
if (b != c) {
dfs(b, a, d ^ 1);
}
}
if (d == 1) {
ans[a] = cnt++;
}
};
dfs(0, -1, 0);
return ans;
}
int find_next_station(int s, int t, vector<int> c) {
int m = c.size();
if (s < c[0]) {
if (s < t && t <= c[0]) {
return c[0];
}
for (int i = 1; i < m - 1; i++) {
if (c[i - 1] < t && t <= c[i]) {
return c[i];
}
}
return c[m - 1];
} else {
if (c[m - 1] <= t && t < s) {
return c[m - 1];
}
for (int i = 1; i < m - 1; i++) {
if (c[i] <= t && t < c[i + 1]) {
return c[i];
}
}
return c[0];
}
}
