#include "stations.h"
#include <bits/stdc++.h>
using namespace std;
void dfs(int v, int par, int level, int &timer, vector<int> &labels, vector<vector<int>> &g) {
if (level % 2 == 0) labels[v] = timer++;
for (int to : g[v]) {
if (to != par) {
dfs(to, v, level + 1, timer, labels, g);
}
}
if (level % 2 != 0) labels[v] = timer++;
}
vector<int> label(int n, int k, vector<int> u, vector<int> v) {
vector<vector<int>>g(n);
vector<int>labels(n);
int timer = 0;
for (int i = 0; i < n - 1; ++i) {
g[u[i]].emplace_back(v[i]);
g[v[i]].emplace_back(u[i]);
}
dfs(0, 0, 0, timer, labels, g);
return labels;
}
int find_next_station(int s, int t, vector<int> c) {
if (c[0] > s) {
if (t < s) {
return c.back();
} else {
auto itr = lower_bound(c.begin(), c.end(), t);
if (itr == c.end()) --itr;
return (*itr);
}
} else {
if (t > s) {
return c[0];
} else {
auto itr = upper_bound(c.begin(), c.end(), t);
if (itr != c.begin()) --itr;
return (*itr);
}
}
}
