func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int a[110][110];     int n, i, j;     long long s = 0;     cin >> n;     if (n == 1) {       cin >> i;       cout << i;       return 0;     }     for (i = 0; i < n; ++i)       for (j = 0; j < n; ++j) {         cin >> a[i][j];         if (i == j) s += a[i][j];         if (i + j == n - 1) s += a[i][j];         if (i == (n - 1) / 2 || j == (n - 1) / 2) s += a[i][j];       }     cout << s - 2 * a[(n - 1) / 2][(n - 1) / 2];     return 0;   }   