6			3	4
	1
				2
	6	4			1

Difficulty: Super easy (0)

				6
4			5
3	2
				4	2
		2			6
	4

Difficulty: Very easy (0)

	3
			3
			5	1
	5	4
		1
				6

Difficulty: Very easy (0)

		4		1
2			3
		1			5
	6		1

Difficulty: Very hard (0)