| 458 | Poor Pigs | Hard |
| 920 | Number of Music Playlists | Hard |
| 1359 | Count All Valid Pickup and Delivery Options | Hard |
| 1467 | Probability of a Two Boxes Having The Same Number of Distinct Balls | Hard |
| 1569 | Number of Ways to Reorder Array to Get Same BST | Hard |
| 1643 | Kth Smallest Instructions | Hard |
| 1735 | Count Ways to Make Array With Product | Hard |
| 1830 | Minimum Number of Operations to Make String Sorted | Hard |
| 1863 | Sum of All Subset XOR Totals | Easy |
| 1866 | Number of Ways to Rearrange Sticks With K Sticks Visible | Hard |
| 1916 | Count Ways to Build Rooms in an Ant Colony | Hard |
| 2063 | Vowels of All Substrings | Medium |
| 2221 | Find Triangular Sum of an Array | Medium |
| 2338 | Count the Number of Ideal Arrays | Hard |
| 2400 | Number of Ways to Reach a Position After Exactly k Steps | Medium |
| 2514 | Count Anagrams | Hard |