func_code_string: #include <bits/stdc++.h>   using namespace std;   int n;   int a[300010];   long long ans = 0;   int main() {     ios_base::sync_with_stdio(0);     cin.tie(0);     cin >> n;     for (int i = 1; i <= n; ++i) {       cin >> a[i];     }     sort(a + 1, a + 1 + n);     for (int i = 1; i <= n / 2; ++i) {       long long sum = a[i] + a[n - i + 1];       ans += sum * sum;     }     cout << ans;   }   