#include "stations.h"
#include <bits/stdc++.h>
using namespace std;
#define pb push_back
vector<int> adj[1001], col;
int lab = 0;
void dfs(int s, int p, int lab){
col[s]=lab;
for(auto u : adj[s])
if(u!=p) dfs(u,s,lab+1);
}
vector<int> label(int n, int k, vector<int> a, vector<int> b)
{
col.resize(n,0); lab = 0;
for(int i = 0; i < n; i++) adj[i].clear();
for (int i = 0; i < n-1; i++)
adj[a[i]].pb(b[i]), adj[b[i]].pb(a[i]);
int ind = 0, x=1000;
for(int i = 0; i < n; i++)
if(adj[i].size()>=3) ind = i;
for(auto u : adj[ind]) dfs(u,ind,x),x+=1000;
col[ind] = 0; return col;
}
int fi(int x){ while(x>9) x/=10; return x; }
int find_next_station(int s, int t, vector<int> c){
if(c.size()==1) return c[0];
if(s==0) for(auto u : c) if(fi(u)==fi(s)) return u;
if(fi(s)!=fi(t)) return c[0];
return c[s<t];
}
