| 853 | Car Fleet | Medium |
| 855 | Exam Room | Medium |
| 856 | Score of Parentheses | Medium |
| 858 | Mirror Reflection | Medium |
| 861 | Score After Flipping Matrix | Medium |
| 863 | All Nodes Distance K in Binary Tree | Medium |
| 864 | Image Overlap | Medium |
| 865 | Smallest Subtree with all the Deepest Nodes | Medium |
| 866 | Prime Palindrome | Medium |
| 869 | Reordered Power of 2 | Medium |
| 870 | Advantage Shuffle | Medium |
| 873 | Length of Longest Fibonacci Subsequence | Medium |
| 874 | Walking Robot Simulation | Medium |
| 875 | Koko Eating Bananas | Medium |
| 877 | Stone Game | Medium |
| 880 | Decoded String at Index | Medium |
| 881 | Boats to Save People | Medium |
| 885 | Spiral Matrix III | Medium |
| 886 | Possible Bipartition | Medium |
| 889 | Construct Binary Tree from Preorder and Postorder Traversal | Medium |
| 890 | Find and Replace Pattern | Medium |
| 893 | Groups of Special-Equivalent Strings | Medium |
| 894 | All Possible Full Binary Trees | Medium |
| 898 | Bitwise ORs of Subarrays | Medium |
| 900 | RLE Iterator | Medium |
| 901 | Online Stock Span | Medium |
| 904 | Fruit Into Baskets | Medium |
| 907 | Sum of Subarray Minimums | Medium |
| 909 | Snakes and Ladders | Medium |
| 910 | Smallest Range II | Medium |