trikotnik

char *alpha = "a";

for (int r = 1; r < 5; r++)
{
	for (int n = 1; n < 5; n++)
	{
		if (r == n)
		{
			cout << n;
			alpha = "b";
			continue;
		}

		cout << alpha;
	}

	cout << endl;
	alpha = "a";
}