#include "traffic.h"
#include <bits/stdc++.h>
#include <numeric>
using namespace std;
using ll = long long;
int LocateCentre(int N, int pp[], int S[], int D[]) {
vector<vector<int>> adj(N);
for (int i = 0; i < N - 1; i++) {
adj[S[i]].push_back(D[i]), adj[D[i]].push_back(S[i]);
}
vector<ll> stree(N);
multiset<ll> msi;
function<void(int, int)> dfs = [&](int cur, int par) {
stree[cur] = pp[cur];
for (auto a : adj[cur])
if (a != par) {
dfs(a, cur);
stree[cur] += stree[a];
msi.insert(stree[a]);
}
};
dfs(0, 0);
ll tot = accumulate(pp, pp + N, 0ll);
ll mini = *msi.rbegin();
int ans = 0;
function<void(int, int)> fvvi2 = [&](int cur, int par) {
if (*msi.rbegin() < mini) {
ans = cur;
mini = *msi.rbegin();
}
for (auto a : adj[cur]) {
if (a != par) {
if (!msi.count(stree[a])) {
while (1) {
}
}
msi.erase(msi.find(stree[a]));
msi.insert(tot - stree[a]);
fvvi2(a, cur);
msi.insert(stree[a]);
if (!msi.count(tot - stree[a])) {
while (1) {
}
}
msi.erase(msi.find((tot - stree[a])));
}
}
};
fvvi2(0, 0);
return ans;
}
