55 27 55 27 9 24 1995 9 24 1 2 3 1 2 3 4 1 2 3 4 5 6 1 2 2 3
A equals B B is a proper subset of A A is a proper subset of B A and B are disjoint I'm confused!
| ID | User | Problem | Subject | Hit | Post Date |
| 24527 |
|
d691 | 75076 | 2021-03-02 12:20 |