#include "stations.h"
#include <vector>
#include <bits/stdc++.h>
using namespace std;
const int B = 1000;
std::vector<int> label(int n, int k, std::vector<int> eu, std::vector<int> ev) {
std::vector<int> labels(n, -1);
vector<vector<int>> g(n);
for (int i = 0; i < n - 1; ++i) {
g[ev[i]].push_back(eu[i]);
g[eu[i]].push_back(ev[i]);
}
int start = 0;
for (int i = 1; i < n; ++i) {
if (g[i].size() > g[start].size()) {
start = i;
}
}
function<void(int, int)> Dfs = [&](int v, int p) {
for (int u : g[v]) {
if (u == p) continue;
labels[u] = labels[v] + B;
Dfs(u, v);
}
};
labels[start] = 0;
int cnt = 1;
for (int i : g[start]) {
labels[i] = cnt++;
Dfs(i, start);
}
return labels;
}
int find_next_station(int s, int t, std::vector<int> c) {
if (s > t) {
for (int i : c) if (i < s) return i;
} else {
if ((s - t) % B == 0) {
return s + B;
} else {
for (int i : c) if (i < s) return i;
}
}
assert(false);
}
