func_code_string: #include <bits/stdc++.h>   using namespace std;   const long long N = 1e5 + 50;   signed main() {     ios::sync_with_stdio(0), cin.tie(0), cout.tie(0);     ;     long long n;     cin >> n;     vector<long long> a(n);     for (long long i = 0; i < n; i++) cin >> a[i];     long long ans = 0;     sort(a.begin(), a.end());     for (long long i = 0, j = n - 1; i < j; i++, j--) {       ans += (a[i] + a[j]) * (a[i] + a[j]);     }     cout << ans;   }   