#include <bits/stdc++.h>
#include "stations.h"
using namespace std;
const int mxN = 1005;
int timer;
int l;
vector<int>level(mxN);
vector<int>in(mxN), out(mxN);
vector<int>adj[mxN];
void dfs(int u, int e = -1) {
in[u] = timer++;
level[u] = l;
for(auto z : adj[u]) if(z != e) {
l++;
dfs(z,u);
l--;
}
out[u] = timer++;
}
bool anc(int A, int B) {
return (in[A] <= in[B] && out[A] >= out[B]);
}
vector<int>label(int n, int k, vector<int>u, vector<int>v) {
for(int i = 0 ; i < mxN ; i++)
adj[i].clear();
timer = 0;
l = 0;
for(int i = 0 ; i < n-1 ; i++) {
adj[u[i]].push_back(v[i]);
adj[v[i]].push_back(u[i]);
}
dfs(0);
vector<int>ret(n);
for(int i = 0 ; i < n ; i++)
ret[i] = i;
return ret;
}
int find_next_station(int s, int t, vector<int>c) {
int skip;
for(auto z : c) {
if(level[z] < level[s])
skip = z;
else
if(anc(z,t))
return z;
}
return skip;
}
/*
//#include "stations.h"
#include <cstdio>
#include <cassert>
#include <map>
#include <vector>
#include <algorithm>
static int max_label = 0;
static int r, n, k, q;
static std::vector<int> u, v, labels, answers;
static std::map<int, int> reverse_labels;
static std::vector<std::vector<int>> adjlist;
static int s, t, w;
static std::vector<int> c;
int main() {
assert(scanf("%d", &r) == 1);
for (int tc = 0; tc < r; tc++) {
assert(scanf("%d%d", &n, &k) == 2);
u.resize(n - 1);
v.resize(n - 1);
adjlist.clear();
adjlist.resize(n);
for (int i = 0; i < n - 1; i++) {
assert(scanf("%d%d", &u[i], &v[i]) == 2);
adjlist[u[i]].push_back(v[i]);
adjlist[v[i]].push_back(u[i]);
}
labels = label(n, k, u, v);
if ((int)labels.size() != n) {
printf("Number of labels not equal to %d\n", n);
exit(0);
}
reverse_labels.clear();
for (int i = 0; i < n; i++) {
if (labels[i] < 0 || labels[i] > k) {
printf("Label not in range 0 to %d\n", k);
exit(0);
}
if (reverse_labels.find(labels[i]) != reverse_labels.end()) {
printf("Labels not unique\n");
exit(0);
}
reverse_labels[labels[i]] = i;
if (labels[i] > max_label) {
max_label = labels[i];
}
}
assert(scanf("%d", &q) == 1);
for (int i = 0; i < q; i++) {
assert(scanf("%d%d%d", &s, &t, &w) == 3);
c.clear();
for (int v : adjlist[s]) {
c.push_back(labels[v]);
}
std::sort(c.begin(), c.end());
int answer = find_next_station(labels[s], labels[t], c);
if (!std::binary_search(c.begin(), c.end(), answer)) {
printf("Label %d returned by find_next_station not found in c\n", answer);
exit(0);
}
answers.push_back(reverse_labels[answer]);
}
}
printf("%d\n", max_label);
for (int index : answers) {
printf("%d\n", index);
}
exit(0);
}*/
