This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include "traffic.h"
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define pb push_back
#define F first
#define S second
#define INF 1e18
#define all(v) (v).begin(),(v).end()
#define rall(v) (v).rbegin(),(v).rend()
#define pii pair<int,int>
#define pll pair<ll,ll>
#define OK cout<<"Ok"<<endl;
#define MOD (ll)(1e9+7)
#define endl "\n"
const int mxn=1e6+5;
int a[mxn],b[mxn],node,dis[mxn],len[mxn],SUM;
vector<int>vt[mxn];
ll dfs(int u,int p,int sum,int arr[]){
int ans=0;
for(int v:vt[u]){
if(v!=p){
int k=dfs(v,u,sum+arr[u],arr);
dis[u]=max(dis[u],k);
ans+=k;
}
}
dis[u]=max(dis[u],SUM-ans-arr[u]);
return ans+arr[u];
}
int LocateCentre(int n, int arr[], int S[], int D[]) {
for(int i=0;i<n;i++){
SUM+=arr[i];
}
for(int i=0;i<n-1;i++){
vt[S[i]].pb(D[i]);
vt[D[i]].pb(S[i]);
}
dfs(0,-1,0,arr);
ll maxs=INF,ind;
for(int i=0;i<n;i++){
if(dis[i]<maxs){
maxs=dis[i];
ind=i;
}
}
return ind;
}
Compilation message (stderr)
traffic.cpp: In function 'int LocateCentre(int, int*, int*, int*)':
traffic.cpp:47:9: warning: 'ind' may be used uninitialized in this function [-Wmaybe-uninitialized]
47 | return ind;
| ^~~
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