方法
S1
S2
S3
1
6, 3, 3, 3, 3, 1, 1, 1, 1
6, 3, 3, 3, 3, 3, 1, 1, 1, 1
2
3, 8; 6, 24
3, 1, 8; 6, 3, 24
3, 1, 8