#include "traffic.h"
#include <bits/stdc++.h>
using namespace std;
const int MX = 1e6;
const int INF = 2e9 + 1;
int fans = 0;
vector<int> g[MX], nodes(MX), people(MX), children(MX);
void dfs (int v, int parent) {
for (auto x: g[v]) {
if (x == parent) continue;
dfs(x, v);
children[v] += children[x];
people[v] = max(people[v], children[x] + nodes[x]);
}
people[v] = max(people[v], fans - children[v] - nodes[v]);
}
int LocateCentre (int n, int p[], int d[], int s[]) {
for (int i = 0; i < n; i++) {
fans += p[i];
nodes[i] = p[i];
}
for (int i = 0; i < n - 1; i++) {
g[s[i]].push_back(d[i]);
g[d[i]].push_back(s[i]);
}
dfs(0, -1);
int sol = INF, res = -1;
for (int i = 0; i < n; i++) {
if (people[i] < sol) {
res = i;
sol = people[i];
}
}
return res;
}
