func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     long int n, i;     cin >> n;     long int a[n];     for (i = 0; i < n; i++) {       cin >> a[i];     }     sort(a, a + n);     long long int sum = 0, j = 0;     for (i = 0, j = n - 1; i < j; i++, j--) {       sum = sum + ((a[i] + a[j]) * (a[i] + a[j]));     }     cout << sum;     return 0;   }   