Even Grid

#include <iostream>

const int N = 1e2 + 5;

int n;
char a[N][N];

int main() {
  std::ios::sync_with_stdio(false);
  std::cin.tie(0);
  std::cin >> n;
  for (int i = 1; i <= n; i++) {
    for (int j = 1; j <= n; j++) {
      std::cin >> a[i][j];
    }
  }
  for (int i = 2; i <= n - 1; i++) {
    for (int j = 2; j <= n - 1; j++) {
      a[i][j] = '0';
    }
  }
  for (int j = 2; j <= n - 1; j++) {
    a[n][j] = a[1][j];
  }
  for (int i = 2; i <= n - 1; i++) {
    a[i][n] = a[i][1];
  }
  int x = 0;
  for (int i = 1; i <= n - 1; i++) {
    x ^= (a[i][n] - '0');
  }
  a[n][n] = (char)(x + '0');
  for (int i = 1; i <= n; i++) {
    for (int j = 1; j <= n; j++) {
      std::cout << a[i][j];
    }
    std::cout << '\n';
  }
  return 0;
}

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED

Test 4

Verdict: ACCEPTED

Test 5

Verdict: ACCEPTED

Test 6

Verdict: ACCEPTED

Test 7

Verdict: ACCEPTED

Test 8

Verdict: ACCEPTED

Test 9

Verdict: ACCEPTED

Test 10

Verdict: ACCEPTED

Test 11

Verdict: ACCEPTED