Fraktaali

#include <stdio.h>

unsigned bit(unsigned x, unsigned y) {
	unsigned z = 1;
	for (unsigned b = 0, c; (c = (x | y) & (b - 1));) {
		b = 1u << (31 - __builtin_clz(c));
		z ^= !!(x & y & b);
	}
	return z;
}

int main(void) {
	for (unsigned n; scanf("%u", &n) == 1;) {
		for (unsigned i = 0, j = (1u << --n) - 1; !(i >> (n + n));) {
			putchar(bit(i & j, i >> n)[".#"]);
			if ((i++ & j) == j) {
				putchar('\n');
			}
		}
	}
}

Test 1

Group: 1

Verdict: ACCEPTED

Test 2

Group: 2

Verdict: ACCEPTED

Test 3

Group: 3

Verdict: ACCEPTED

Test 4

Group: 4

Verdict: ACCEPTED

Test 5

Group: 5

Verdict: ACCEPTED

Test 6

Group: 6

Verdict: ACCEPTED

Test 7

Group: 7

Verdict: ACCEPTED

Test 8

Group: 8

Verdict: ACCEPTED

Test 9

Group: 9

Verdict: ACCEPTED

Test 10

Group: 10

Verdict: ACCEPTED