| ID | Title | Difficulty |
|---|---|---|
| 458 | Poor Pigs | Hard |
| 920 | Number of Music Playlists | Hard |
| 1359 | Count All Valid Pickup and Delivery Options | Hard |
| 2400 | Number of Ways to Reach a Position After Exactly k Steps | Medium |
| ID | Title | Difficulty |
|---|---|---|
| 458 | Poor Pigs | Hard |
| 920 | Number of Music Playlists | Hard |
| 1359 | Count All Valid Pickup and Delivery Options | Hard |
| 2400 | Number of Ways to Reach a Position After Exactly k Steps | Medium |