| 1656 | Design an Ordered Stream | Easy |
| 1670 | Design Front Middle Back Queue | Medium |
| 1797 | Design Authentication Manager | Medium |
| 1825 | Finding MK Average | Hard |
| 1845 | Seat Reservation Manager | Medium |
| 1865 | Finding Pairs With a Certain Sum | Medium |
| 1912 | Design Movie Rental System | Hard |
| 1993 | Operations on Tree | Medium |
| 2013 | Detect Squares | Medium |
| 2034 | Stock Price Fluctuation | Medium |
| 2043 | Simple Bank System | Medium |
| 2069 | Walking Robot Simulation II | Medium |
| 2080 | Range Frequency Queries | Medium |
| 2102 | Sequentially Ordinal Rank Tracker | Hard |
| 2166 | Design Bitset | Medium |
| 2227 | Encrypt and Decrypt Strings | Hard |
| 2241 | Design an ATM Machine | Medium |
| 2276 | Count Integers in Intervals | Hard |
| 2286 | Booking Concert Tickets in Groups | Hard |
| 2296 | Design a Text Editor | Hard |
| 2336 | Smallest Number in Infinite Set | Medium |
| 2349 | Design a Number Container System | Medium |
| 2353 | Design a Food Rating System | Medium |
| 2502 | Design Memory Allocator | Medium |
| 2526 | Find Consecutive Integers from a Data Stream | Medium |
| 2642 | Design Graph With Shortest Path Calculator | Hard |
| 2671 | Frequency Tracker | Medium |