| Day | Note | Stars |
|---|---|---|
| 1 | Priority Queue | ⭐⭐ |
| 2 | Pattern Matching | ⭐⭐ |
| 3 | HashMap | ⭐⭐ |
| 4 | Stack | ⭐⭐ |
| 5 | Stack | ⭐⭐ |
| 6 | HashSet | ⭐⭐ |
| 7 | Linked List | ⭐⭐ |
| 8 | Prefix Sum | ⭐⭐ |
| 9 | HashSet | ⭐⭐ |
| 10 | Stack | ⭐⭐ |
| 11 | HashMap | ⭐⭐ |
| 12 | Breadth-first search | ⭐⭐ |
| 13 | Recursion | ⭐⭐ |
| 14 | HashMap | ⭐⭐ |
| 15 | VecDeque, HashMap | ⭐⭐ |
| 16 | Dynamic Programming | ⭐⭐ |
| 17 | Cycle Detection | ⭐⭐ |
| 18 | Flood fill | ⭐⭐ |
| 19 | Depth-first search | ⭐⭐ |
| 20 | VecDeque | ⭐⭐ |
| 21 | Binary search | ⭐⭐ |
| 22 | HashMap | ⭐ |
| 23 | HashMap | ⭐⭐ |