时间 |
1 |
2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
x |
|
A |
|
A |
|
A |
|
A |
|
A |
y |
|
|
B |
|
|
B |
|
|
B |
|
次数 |
|
1 | 2 | 3 |
|
4 |
|
5 | 6 | 7 |
2 3 10
7