n=4的一些解
.....1........1........2........2........2........2........2........2
....2.0......2.0......3.1......4.0......2.2......0.4......4.0......2.2
...2.0.1....0.1.2....2.4.0....2.2.2....4.1.1....1.3.2....1.2.3....0.3.3
..0.1.1.2..2.0.0.2..1.4.2.1..4.1.2.1..2.3.3.0..2.0.3.3..2.3.1.2..4.1.3.0
