func_code_string: #include <bits/stdc++.h>   using namespace std;   int n;   int main() {     cin >> n;     int ans = 0;     for (int i = 0; i < n; i++)       for (int j = 0; j < n; j++) {         int a;         cin >> a;         if (i == j || i + j == n - 1 || i == n / 2 || j == n / 2) ans += a;       }     cout << ans;   }   