#include "vector"
#include "traffic.h"
const int maxn = 1e6+10;
std::vector<int> grafo[maxn];
int c[maxn], sum[maxn], ans=2000000010, idans;
void dfs(int u, int p=-1){
sum[u] = c[u];
for(auto v : grafo[u]){
if(v == p) continue;
dfs(v, u);
sum[u] += sum[v];
}
}
int diff;
void solve(int u, int p=-1){
int maxi = 0;
for(auto v : grafo[u]){
if(v == p) continue;
if(maxi < sum[v]) maxi = sum[v];
solve(v, u);
}
diff = sum[0] - sum[u];
if(maxi < diff) maxi = diff;
if(ans > maxi){
ans = maxi;
idans = u;
}
}
int LocateCentre(int n, int *p, int *s, int *d){
for(int i=0; i<n; i++){
c[i] = p[i];
if(i+1<n){
grafo[s[i]].push_back(d[i]);
grafo[d[i]].push_back(s[i]);
}
}
dfs(0);
solve(0);
return idans;
}
