n=4的一些解
..0..1..3..1....0..2..0..2....0..2..0..2....0..2..0..2....0..1..3..1
..2..0..2..0....3..1..3..1....2..0..3..1....3..1..3..1....2..0..2..0
..1..3..1..3....1..0..2..3....1..3..1..3....1..3..1..3....0..2..1..3
..0..2..3..2....1..2..0..3....0..1..3..2....0..2..0..2....3..1..3..2
|