#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;
ll sum[M];
void dfs(int i,int par){
sum[i] = people[i];
for(auto u:gr[i]){
if(u!=par){
dfs(u,i);
sum[i]+=sum[u];
}
}
}
ll df(int i,int par){
ll res = people[i];
for(auto u:gr[i]){
if(u != par){
res += df(u,i);
}
}
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;
dfs(0,0);
ll res = 1e18;
int city = 0;
ll x = 0;
for(auto i:gr[0]){
x = max(x,df(i,0));
res = x;
}
for(int i=1;i<n;i++){
x = max(sum[0]-sum[i],sum[i]-p[i]);
if(x < res){
city = i;
res = x;
}
}
return city;
}
/*
int main(){
int p[6] = {10,10,10,10,10,10},s[5] = {1,2,3,4,0},d[5] = {5,1,2,1,4};
cout<<LocateCentre(6,p,s,d)<<'\n';
return 0;
}
*/
