#include "bits/stdc++.h"
using namespace std;
using ll = long long;
#define pb push_back
#define mp make_pair
#define f first
#define s second
#define sz(x) ((int)x.size())
#define all(x) x.begin(),x.end()
#define rall(x) x.rbegin(),x.rend()
// Hi
const int M = 1e6;
vector<int> gr[M];
int *people;
pair<ll,ll> dfs(int i,int par){
pair<ll,ll> res = {-1,-1};
for(auto u:gr[i]){
if(u!= par){
pair<ll,ll> p = dfs(u,i);
if(res.f == -1){
res.f = p.f+people[u];
}else res.s = p.f+people[u];
}
}
return res;
}
ll LocateCentre(int n,int p[],int ff[],int d[]){
for(int i=0;i<n-1;i++){
gr[ff[i]].pb(d[i]);
gr[d[i]].pb(ff[i]);
}
people = p;
ll res = 1e18;
int city = 0;
for(int i=0;i<n;i++){
pair<ll,ll> x = dfs(i,i);
if(max(x.f,x.s) < res){
res = max(x.f,x.s);
city = i;
}
}
return city;
}
/*
int main(){
int p[5] = {10,10,10,20,20},s[4] = {0,1,2,3},d[4] = {1,2,3,4};
cout<<LocateCentre(5,p,s,d)<<'\n';
return 0;
}
*/
