Fraktaali

#include <stdio.h>

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

int main() {
	for (unsigned n; scanf("%u", &n) == 1;) {
		n = 1 << (n - 1);
		for (unsigned xy = 0; xy < n * n; ++xy) {
			putchar(".#"[bit(xy % n, xy / n)]);
			if (xy % n == n-1) 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