func_code_string: #include <bits/stdc++.h>   using namespace std;   int v[3 * 100001];   int main() {     int n;     long long s = 0;     cin >> n;     for (int i = 1; i <= n; ++i) {       cin >> v[i];     }     sort(v + 1, v + n + 1);     for (int i = 1; i <= n / 2; ++i) {       s += (v[i] + v[n - i + 1]) * (v[i] + v[n - i + 1]);     }     cout << s;     return 0;   }   