#include <bits/stdc++.h>
#include "traffic.h"
using namespace std;
#define ll long long
#define pb push_back
#define pii pair<int,int>
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
#define sz(a) ((int)a.size())
const int N=1e6+10;
ll n, ps[N], ss[N];
ll pss[N], sss[N];
int LocateCentre(int N_,int P[],int S[],int D[]) {
n=N_;
for (int i=1; i<=n; i++) {
ps[i]=ps[i-1]+P[i-1];
pss[i]=pss[i-1]+ps[i];
}
for (int i=n; i>=1; i--) {
ss[i]=ss[i+1]+P[i-1];
sss[i]=sss[i+1]+ss[i];
}
ll ans=(ll)(1e18);
int ret=0;
for (int i=1; i<=n; i++) {
if (ans>pss[i-1]+sss[i+1]) {
ans=pss[i-1]+sss[i+1];
ret=i;
}
}
return (ret-1);
}
// int main () {
// ios::sync_with_stdio(false), cin.tie(0);
// return 0;
// }
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