| 225 | Implement Stack using Queues | Easy |
| 232 | Implement Queue using Stacks | Easy |
| 239 | Sliding Window Maximum | Hard |
| 341 | Flatten Nested List Iterator | Medium |
| 387 | First Unique Character in a String | Easy |
| 622 | Design Circular Queue | Medium |
| 641 | Design Circular Deque | Medium |
| 649 | Dota2 Senate | Medium |
| 862 | Shortest Subarray with Sum at Least K | Hard |
| 918 | Maximum Sum Circular Subarray | Medium |
| 933 | Number of Recent Calls | Easy |
| 936 | Stamping The Sequence | Hard |
| 950 | Reveal Cards In Increasing Order | Medium |
| 995 | Minimum Number of K Consecutive Bit Flips | Hard |
| 1352 | Product of the Last K Numbers | Medium |
| 1425 | Constrained Subsequence Sum | Hard |
| 1438 | Longest Continuous Subarray With Absolute Diff Less Than or Equal to Limit | Medium |
| 1499 | Max Value of Equation | Hard |
| 1670 | Design Front Middle Back Queue | Medium |
| 1687 | Delivering Boxes from Storage to Ports | Hard |
| 1696 | Jump Game VI | Medium |
| 1700 | Number of Students Unable to Eat Lunch | Easy |
| 1823 | Find the Winner of the Circular Game | Medium |
| 1825 | Finding MK Average | Hard |
| 2071 | Maximum Number of Tasks You Can Assign | Hard |
| 2073 | Time Needed to Buy Tickets | Easy |
| 2327 | Number of People Aware of a Secret | Medium |
| 2398 | Maximum Number of Robots Within Budget | Hard |
| 2526 | Find Consecutive Integers from a Data Stream | Medium |
| 2528 | Maximize the Minimum Powered City | Hard |