#include <bits/stdc++.h>
using namespace std;
using tint = long long;
using ld = long double;
#define forsn(i, s, n) for(int i = s; i < int(n); i++)
#define forn(i, n) forsn(i, 0, n)
#define trav(a, x) for(auto& a : x)
using vi = vector<int>;
using vl = vector<tint>;
using vb = vector<bool>;
#define pb push_back
#define pf push_front
#define rsz resize
#define all(x) begin(x), end(x)
#define rall(x) x.rbegin(), x.rend()
#define sz(x) (int)(x).size()
#define ins insert
#define esta(x,c) ((c).find(x) != (c).end())
using pi = pair<int,int>;
using pl = pair<tint,tint>;
#define f first
#define s second
#define mp make_pair
#define DBG(x) cerr << #x << " = " << x << endl;
const int MOD = 1e9+7;
const tint mod = 998244353;
const int MX = 1e6+5;
const tint INF = 1e18;
const int inf = 2e9;
const ld PI = acos(ld(-1));
const ld eps = 1e-8;
const int dx[4] = {1, -1, 0, 0};
const int dy[4] = {0, 0, 1, -1};
template<class T> void remDup(vector<T> &v){
sort(all(v)); v.erase(unique(all(v)),end(v));
}
template<class T> bool valid(T x, T y, T n, T m){
return (0<=x && x<n && 0<=y && y<m);
}
tint cdiv(tint a, tint b) { return a/b+((a^b)>0&&a%b); } //redondea p arriba
int fdiv(int a, int b) { return a/b-((a^b)<0&&a%b); } //redonde p abajo
void NACHO(string name = "cbarn"){
ios_base::sync_with_stdio(0); cin.tie(0);
//freopen((name+".in").c_str(), "r", stdin);
//freopen((name+".out").c_str(), "w", stdout);
}
vi adj[MX];
int dp[MX];
int val[MX];
int sum = 0;
int best = inf;
int ret;
void dfs(int node, int pa){
int sumSon = 0;
int maxi = 0;
trav(u, adj[node]){
if(u != pa){
sumSon+=val[u];
dfs(u, node);
maxi = max(maxi, val[u]+dp[u]);
sumSon+=dp[u];
}
}
int dad = sum-sumSon-val[node];
maxi = max(maxi, dad);
if(maxi < best){
best = maxi;
ret = node;
}
}
int main(){
NACHO();
int n; cin >> n;
forn(i, n) cin >> val[i], sum+=val[i];
forn(i, n-1){
int u, v; cin >> u >> v;
adj[u].pb(v);
adj[v].pb(u);
}
dfs(0, -1);
cout << ret << "\n";
}
Compilation message
/tmp/ccV7EUdh.o: In function `main':
grader.cpp:(.text.startup+0x0): multiple definition of `main'
/tmp/ccsVnNlF.o:traffic.cpp:(.text.startup+0x0): first defined here
/tmp/ccV7EUdh.o: In function `main':
grader.cpp:(.text.startup+0xd9): undefined reference to `LocateCentre(int, int*, int*, int*)'
collect2: error: ld returned 1 exit status
