func_code_string: #include <bits/stdc++.h>   using namespace std;   void toogle(vector<vector<int> >& v, int i, int j) {     if (v[i][j] == 1) {       v[i][j] = 0;     } else if (v[i][j] == 0) {       v[i][j] = 1;     }   }   int main() {     vector<vector<int> > v(3, vector<int>(3, 1));     int i, j, e;     for (i = 0; i < 3; i++) {       for (j = 0; j < 3; j++) {         cin >> e;         if (e % 2 == 0) {           continue;         } else {           toogle(v, i, j);           if (i - 1 >= 0) toogle(v, i - 1, j);           if (j - 1 >= 0) toogle(v, i, j - 1);           if (i + 1 < 3) toogle(v, i + 1, j);           if (j + 1 < 3) toogle(v, i, j + 1);         }       }     }     for (i = 0; i < 3; i++) {       for (j = 0; j < 3; j++) {         cout << v[i][j];       }       cout << endl;     }   }   