func_code_string: #include <bits/stdc++.h>   using namespace std;   const int M = 512;   const int T = 101;   int n, m;   long long a[M][M];   long long b[M][M];   int t;   int x[T], y[T];   void solve(int xl, int xr, int yl, int yr) {     if (xl == xr && yl == yr) {       b[xl][yl] = a[xl][yl];     } else if (xl != xr) {       int tm = (xr - xl + 1);       int um = (yr - yl + 1);       for (int i = xl; i < xl + tm / 2; i++) {         for (int j = yl; j <= yr; j++) a[i + tm / 2][j] ^= a[i][j];       }       solve(xl + tm / 2, xr, yl, yr);       for (int i = xl; i < xl + tm / 2; i++) {         for (int j = yl; j <= yr; j++) a[i + tm / 2][j] ^= a[i][j];       }       for (int i = xl + tm / 2; i <= xr; i++) {         for (int j = yl; j <= yr; j++) {           for (int k = 1; k <= t; k++) {             if ((i + x[k]) % tm < tm / 2)               a[xl + (i + x[k]) % tm][yl + (j + y[k]) % um] ^= b[i][j];           }         }       }       solve(xl, xl + tm / 2 - 1, yl, yr);       for (int i = xl + tm / 2; i <= xr; i++) {         for (int j = yl; j <= yr; j++) {           for (int k = 1; k <= t; k++) {             if ((i + x[k]) % tm < tm / 2)               a[xl + (i + x[k]) % tm][yl + (j + y[k]) % um] ^= b[i][j];           }           b[i][j] ^= b[i - tm / 2][j];         }       }     } else {       int tm = (xr - xl + 1);       int um = (yr - yl + 1);       for (int i = xl; i <= xr; i++) {         for (int j = yl; j < yl + um / 2; j++) a[i][j + um / 2] ^= a[i][j];       }       solve(xl, xr, yl + um / 2, yr);       for (int i = xl; i <= xr; i++) {         for (int j = yl; j < yl + um / 2; j++) a[i][j + um / 2] ^= a[i][j];       }       for (int i = xl; i <= xr; i++) {         for (int j = yl + um / 2; j <= yr; j++) {           for (int k = 1; k <= t; k++) {             if ((j + y[k]) % um < um / 2)               a[xl + (i + x[k]) % tm][yl + (j + y[k]) % um] ^= b[i][j];           }         }       }       solve(xl, xr, yl, yl + um / 2 - 1);       for (int i = xl; i <= xr; i++) {         for (int j = yl + um / 2; j <= yr; j++) {           for (int k = 1; k <= t; k++) {             if ((j + y[k]) % um < um / 2)               a[xl + (i + x[k]) % tm][yl + (j + y[k]) % um] ^= b[i][j];           }           b[i][j] ^= b[i][j - um / 2];         }       }     }   }   int main() {     ios::sync_with_stdio(false);     cin >> n;     m = 1 << n;     for (int i = 0; i < m; i++) {       for (int j = 0; j < m; j++) {         cin >> a[i][j];       }     }     cin >> t;     for (int i = 1; i <= t; i++) {       cin >> x[i] >> y[i];     }     solve(0, m - 1, 0, m - 1);     int ans = 0;     for (int i = 0; i < m; i++) {       for (int j = 0; j < m; j++) {         ans += (b[i][j] != 0);       }     }     cout << ans <<   n ;   }   