func_code_string: #include <bits/stdc++.h>   using namespace std;   void debug() {}   int const N = 1e3 + 9, OO = 1e9;   int main() {     int n, q, type, a;     char b;     bool prd = 0;     scanf( %d , &n);     for (int i = 0; i < n; ++i) {       for (int j = 0; j < n; ++j) {         scanf(  %c , &b);         if (j == i && b ==  1 ) prd = !prd;       }     }     scanf( %d , &q);     for (int i = 0; i < q; ++i) {       scanf( %d , &type);       if (type != 3) scanf( %d , &a);       if (type == 1 || type == 2)         prd = !prd;       else         printf((prd) ?  1  :  0 );     }   }   