#include "stations.h"
#include <bits/stdc++.h>
using namespace std;
vector<int> label(int n, int k, vector<int> u, vector<int> v) {
vector<int> labels(n);
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]);
}
vector<int> st(n);
int timer = 0;
function<void(int, int)> dfs = [&](int u, int p) {
st[u] = timer++;
for (int v : adj[u]) {
if (v == p) continue;
dfs(v, u);
}
};
dfs(0, -1);
for (int i = 0; i < n; i++) {
labels[i] = st[i];
}
return labels;
}
int find_next_station(int s, int t, vector<int> c) {
if (t < s) {
assert(c[0] < s);
return c[0];
}
int answer = c.back();
for (const auto& v : c) {
if (v > t) {
answer = *prev(&v);
break;
}
}
return answer;
}
