#include "stations.h"
#include <bits/stdc++.h>
using namespace std;
vector<int> vals;
int t = 0;
void dfs(vector<vector<int>> &adj, int node, int p, int f)
{
if(f)vals[node] = t++;
for (auto a : adj[node])
{
if (a != p)
dfs(adj, a, node, !f);
}
if(!f)vals[node] = t++;
}
vector<int> label(int n, int k, vector<int> u, vector<int> v)
{
vector<vector<int>> adj(n + 1);
for (int i = 0; i < n - 1; i++)
{
adj[u[i]].push_back(v[i]);
adj[v[i]].push_back(u[i]);
}
vals.resize(n, 0);
dfs(adj, 0, -1, 1);
return vals;
}
int find_next_station(int s, int t, vector<int> c)
{
if (c.back() < s) reverse(c.begin(), c.end());
for (int x: c) if (min(s, x) <= t && t <= max(s, x)) return x;
return c.back();
}
