Laivanupotus

#include<iostream>
#include<vector>
#include<map>
#include<set>
#include<stack>
#include<queue>
#include<algorithm>
#include<cmath>
#include<utility>

using namespace std;

int main(void) {
  ios_base::sync_with_stdio(false);
  cin.tie(0);
  
  int64_t n;
  cin >> n;
  for(int64_t i=0;i<n;i++) {
    for(int64_t j=0;j<n;j++) {
      if((i+j)%4 == 3) {
        cout << '*';
      } else {
        cout << '.';
      }
    }
    cout << '\n';
  }
  return 0;
}

Test 1

Group: 1

Verdict: ACCEPTED

Test 2

Group: 1

Verdict: ACCEPTED

Test 3

Group: 1

Verdict: ACCEPTED

Test 4

Group: 1

Verdict: ACCEPTED

Test 5

Group: 1

Verdict: ACCEPTED

Test 6

Group: 2

Verdict: ACCEPTED

Test 7

Group: 2

Verdict: ACCEPTED

Test 8

Group: 2

Verdict: ACCEPTED

Test 9

Group: 2

Verdict: ACCEPTED

Test 10

Group: 2

Verdict: ACCEPTED

Test 11

Group: 3

Verdict: ACCEPTED

Test 12

Group: 3

Verdict: ACCEPTED

Test 13

Group: 3

Verdict: ACCEPTED

Test 14

Group: 3

Verdict: ACCEPTED

Test 15

Group: 3

Verdict: ACCEPTED