func_code_string: #include <bits/stdc++.h>   int mat[1010][1010];   int counts = 0;   int main() {     int n;     scanf( %d , &n);     for (int i = 1; i <= n; i++) {       for (int j = 1; j <= n; j++) scanf( %d , &mat[i][j]);     }     counts = 0;     for (int i = 1; i <= n; i++) counts += mat[i][i];     counts %= 2;     int m;     scanf( %d , &m);     for (int i = 1; i <= m; i++) {       int a;       scanf( %d , &a);       if (a == 1 || a == 2) {         int b;         scanf( %d , &b);         mat[b][b] = 1 - mat[b][b];         counts = 1 - counts;       } else         printf( %d , counts);     }     printf(  n );     return 0;   }   