未知题目

#include<iostream>
#include<cmath>
#include<algorithm>
using namespace std;
#define ll long long
const int maxn=1e6+10;
ll a[maxn],sum, aa, ans;
int n;

int main()
{
    cin>>n;
    for (int i=1;i<=n;i++) {cin>>a[i];sum+=a[i];}
    sum/=n;
    a[1]=sum-a[1];
    for (int i=2;i<=n;i++){
        aa=sum-a[i];
        a[i]=a[i-1]+aa;
    }
    sort(a+1,a+n+1);
    aa=a[n/2+1];
    for (int i=1;i<=n;i++) ans+=abs(aa-a[i]);
    cout<<ans<<endl;
}