#include "stations.h"
#include <vector>
#include <algorithm>
#include <iostream>
#include <numeric>
using namespace std;
const int N = 1010;
int T;
int tin[N];
int tout[N];
vector<int> g[N];
void precalc(int s, int p) {
tin[s] = T++;
for (int to : g[s]) if (to != p)
precalc(to, s);
tout[s] = T++;
}
vector<int> label(int n, int k, vector<int> u, vector<int> v) {
T = 0;
for (int i = 0; i < n; i++) {
g[i].clear();
}
for (int i = 0; i < n - 1; i++) {
g[u[i]].push_back(v[i]);
g[v[i]].push_back(u[i]);
}
vector<int> labels(n);
precalc(0, 0);
for (int i = 0; i < n; i++)
if (tin[i] & 1)
labels[i] = tout[i];
else
labels[i] = tin[i];
vector<int> ord(n);
iota(ord.begin(), ord.end(), 0);
sort(ord.begin(), ord.end(), [&](int x, int y) {
return labels[x] < labels[y];
});
for (int i = 0; i < n; i++)
labels[ord[i]] = i;
return labels;
}
int find_next_station(int s, int t, vector<int> c) {
if ((int)c.size() == 1)
return c[0];
int m = (int)c.size();
sort(c.begin(), c.end());
if (!s) {
int prev = s;
for (int i = 0; i < m; i++) {
int l = prev + 1;
int r = c[i];
prev = c[i];
if (l <= t && t <= r)
return c[i];
}
}
if (s < c[0]) {
int prev = s + 1;
for (int i = 0; i < m - 1; i++) {
int l = prev;
int r = c[i];
prev = c[i] + 1;
if (l <= t && t <= r)
return c[i];
}
return c.back( );
}
int prev = s - 1;
for (int i = m - 1; i >= 1; i--) {
int l = c[i];
int r = prev;
prev = c[i] - 1;
if (l <= t && t <= r)
return c[i];
}
return c[0];
}
