层次A 权值 层次B | A1 | A2 |
| Am | 层次总排序 |
a1 | a2 |
| am | ||
B1 | b11 | b12 |
| b1m |
|
B2 | b21 | b22 |
| b2m |
|
|
|
|
|
|
|
Bn | bn1 | bn2 |
| Bnm |
|