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