#include<bits/stdc++.h>
#define ll long long 
using namespace std;
ll n;
ll main(){
	
	cin>>n;
	ll a[n+5]={0};
	for(ll i=1;i<=n;i++){
		cin>>a[i];
	}
	sort(a+1,a+1+n);
	ll k=0;
	
	for(ll i=0;i<=n/2;i++){
		if(n-i>i)k+=(a[n-i]-a[i])*(a[n-i]-a[i]);
		if(n-i>i+1)k+=(a[n-i]-a[i+1])*(a[n-i]-a[i+1]);
	}
	cout<<k;
}

好像对了！！ 但好像有不对