// I can do all things through Christ who strengthens me
// Philippians 4:13
#include "stations.h"
#include <bits/stdc++.h>
using namespace std;
#define REP(i, j, k) for (int i = j; i < (k); i++)
#define RREP(i, j, k) for (int i = j; i >= (k); i--)
template <class T>
inline bool mnto(T &a, const T b) {return a > b ? a = b, 1 : 0;}
template <class T>
inline bool mxto(T &a, const T b) {return a < b ? a = b, 1 : 0;}
typedef long long ll;
typedef long double ld;
#define FI first
#define SE second
typedef pair<int, int> ii;
typedef pair<ll, ll> pll;
#define ALL(x) x.begin(), x.end()
#define SZ(x) (int) x.size()
#define pb push_back
typedef vector<int> vi;
typedef vector<ll> vll;
typedef vector<ii> vii;
typedef tuple<int, int, int> iii;
typedef vector<iii> viii;
#ifndef DEBUG
#define cerr if (0) cerr
#endif
const int INF = 1000000005;
const ll LINF = 1000000000000000005;
const int MAXN = 500005;
vi label(int n, int k, vi u, vi v) {
vector<vi> adj(n);
REP (i, 0, n - 1) {
adj[u[i]].pb(v[i]);
adj[v[i]].pb(u[i]);
}
int ptr = 10;
vi l(n);
vi d(n);
function<void(int, int)> dfs = [&] (int u, int p) {
if (d[u] == 0) {
l[u] = ptr++;
}
for (int v : adj[u]) {
if (v == p) {
continue;
}
d[v] = d[u] ^ 1;
dfs(v, u);
}
if (d[u] == 1) {
l[u] = ptr++;
}
};
dfs(0, -1);
return l;
}
int find_next_station(int s, int t, vi c) {
if (SZ(c) == 1) {
return c[0];
}
if (s > c.back()) {
if (t < c[1] || t > s) {
return c[0];
}
RREP (i, SZ(c) - 1, 1) {
if (c[i] <= t) {
return c[i];
}
}
assert(0);
} else {
assert(s < c[0]);
if (s != 0 && (t < s || t > c[SZ(c) - 2])) {
return c.back();
}
REP (i, 0, SZ(c) - (s > 0)) {
if (t <= c[i]) {
return c[i];
}
}
assert(0);
}
}
