n=4的一些解:
..1..2..2..2..2....2..1..1..2..2....2..2..1..0..0....1..1..1..1..1
..0..1..1..1..1....1..1..1..2..2....0..0..0..0..0....1..1..1..2..2
..1..2..2..2..2....1..1..1..2..2....0..0..0..0..1....1..1..1..2..2
..1..2..2..2..2....1..1..1..2..2....0..0..1..1..2....0..0..0..1..1