| Problem ID | Title | AC |
|---|---|---|
| 1462 Problem A | We only want the smallest | Y |
| 1280 Problem B | Cut the stick | Y |
| 1507 Problem C | Funny Fluffy Tuzi | Y |
| 1506 Problem D | Irotas's Robot |
Problem D: Use AVL Tree, but it will consume too much time during final season, so I give up.