func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     vector<vector<string> > tab(9);     int emp[3][3];     memset(emp, 0, sizeof emp);     for (int i = 0; i < 9; i++) {       tab[i].resize(3);       for (int j = 0; j < 3; j++) {         string a;         cin >> a;         for (int k = 0; k < a.size(); k++) {           if (a[k] ==  . ) emp[i / 3][j]++;         }         tab[i][j] = a;       }     }     int n, m;     cin >> n >> m;     n--;     m--;     char ne;     int ln = n, lm = (m + 1) % 3;     if (tab[ln][lm][m % 3] ==  x )       ne =  o ;     else       ne =  x ;     n = n % 3;     m = m % 3;     if (emp[n][m] == 0) {       for (int i = 0; i < 9; i++) {         for (int j = 0; j < 3; j++) {           string a = tab[i][j];           for (int k = 0; k < 3; k++) {             if (a[k] ==  . ) tab[i][j][k] =  ! ;           }         }       }     } else {       for (int i = n * 3; i < (n + 1) * 3; i++) {         string a = tab[i][m];         for (int j = 0; j < 3; j++) {           if (a[j] ==  . ) tab[i][m][j] =  ! ;         }       }     }     for (int i = 0; i < 9; i++) {       if (i != 0 && i % 3 == 0) cout << endl;       for (int j = 0; j < 3; j++) {         cout << tab[i][j] <<    ;       }       cout << endl;     }     return 0;   }   