func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int n;     cin >> n;     bool b[4][n][n];     for (int i = 0; i < 4; i++) {       for (int j = 0; j < n; j++) {         char c[n + 1];         scanf( %s , &c);         for (int k = 0; k < n; k++) b[i][j][k] = c[k] ==  1  ? 1 : 0;       }     }     int s[] = {0, 1, 2, 3}, mi = 1e9, co = 0;     bool o = 0;     do {       for (int k = 0; k < 4; k += 2) {         for (int j = 0; j < n; j++) {           for (int i = 0; i < n; i++) {             if (b[s[k]][j][i] != o) co++;             o ^= 1;           }           for (int i = 0; i < n; i++) {             if (b[s[k + 1]][j][i] != o) co++;             o ^= 1;           }           o ^= 1;         }       }       mi = min(mi, co);       co = 0;     } while (next_permutation(s, s + 4));     cout << mi <<   n ;     return 0;   }   