Ruudukko

#include <iostream>
#include <cstring>
using namespace std;
char res[21][21];
int main() {
	int n;
	cin>>n;
	for(int i=0; i<20; ++i)memset(res[i],'#',20);
	for(int i=0; i<20; ++i)res[i][19]='.';
	for(int i=0; i<19; ++i) {
		if (n&(1<<i)) {
			memset(res[2*i]+i,'.',20-i);
		}
		for(int a=2*i;a<2*i+2;++a)for(int b=i;b<i+2;++b) res[a][b]='.';
	}
	for(int i=0; i<20; ++i)cout<<res[i]<<'\n';
}

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