n=4的一些解
.....0........0........0........0........0........0........0........0
....0.0......0.1......1.2......1.0......0.0......1.2......1.0......0.1
...0.0.0....2.3.3....1.2.1....2.3.0....1.0.2....1.2.0....2.1.2....1.0.2
..1.2.2.2..2.2.3.2..0.1.1.2..2.3.2.0..1.2.3.3..2.2.0.1..1.2.1.2..3.1.0.0
