#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define int ll
#define pb push_back
#define mp make_pair
#define fir first
#define sec second
#define all(a) a.begin(), a.end()
const int maxn = 200010;
const ll MOD = 1e9+7;
const int INF = 1e9;
const ll LINF = 1e18;
ll n, m, a[maxn], b[maxn];
//map<int, int> M, N;
string s, ss;
//set<int> S;
int dis = LINF, ind = -1;
vector<int> adj[maxn];
int subtree[maxn], ppl[maxn];
int fans = 0;
void dfs(int s, int p=-1)
{
for(auto u : adj[s])
{
if(u==p)continue;
dfs(u,s), subtree[s]+=subtree[u];
ppl[s] = max(ppl[s], subtree[u]);
}
ppl[s] = max(ppl[s], fans-subtree[s]-a[s]);
subtree[s]+=a[s];
}
int LocateCentre(int N, int pp[], int S[], int D[])
{
int i;
for(i = 0; i < N-1; i++) a[i]=pp[i], adj[S[i]].pb(D[i]), adj[D[i]].pb(S[i]), fans+=a[i];
a[N-1]=pp[N-1], fans+=a[N-1];
dfs(0);
for(i = 0; i < N; i++)
if(dis>pp[i])dis=pp[i],ind=i;
return ind;
}
Compilation message
/tmp/ccTUhqmx.o: In function `main':
grader.cpp:(.text.startup+0xd9): undefined reference to `LocateCentre(int, int*, int*, int*)'
collect2: error: ld returned 1 exit status
