n=4的一些解决方案:
..1..2..2..1..0..1..2....0..2..0..3..3..2..0....2..0..0..2..0..3..0
..3..2..2..2..1..1..3....0..2..1..0..2..2..1....2..2..1..3..3..3..1
..0..3..2...2...1...0...0..3..2...0...3...2...1...3...2...2...3...3...3...2
..0..0..3..3..2..2..1....1..0..2..2..1..0..2....0..1..2..3..0..0..3
..0..0..3..3..2..2..0....2..0..0..3..2..0..0....0..0..3..0..0..0..2
|