func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int n;     cin >> n;     int matrix[n][n], sum = 0;     for (int i = 0; i < n; i++) {       for (int j = 0; j < n; j++) {         cin >> matrix[i][j];       }     }     int j = 0;     for (int i = 0; i < n; i++) {       sum += matrix[i][i];     }     for (int i = n - 1; i >= 0; i--) {       sum += matrix[i][j];       j++;     }     int ind = (n - 1) / 2;     for (auto it : matrix) sum += it[ind];     for (int i = 0; i < n; i++) sum += matrix[ind][i];     cout << sum - (3 * matrix[ind][ind]);     return 0;   }   