| 808. Soup Servings | Solution | Solve | Medium | | |
| 809. Expressive Words | Solution | Solve | Medium | | |
| 811. Subdomain Visit Count | Solution | Solve | Medium | | |
| 813. Largest Sum of Averages | Solution | Solve | Medium | | |
| 814. Binary Tree Pruning | Solution | Solve | Medium | | |
| 816. Ambiguous Coordinates | Solution | Solve | Medium | | |
| 817. Linked List Components | Solution | Solve | Medium | | |
| 820. Short Encoding of Words | Solution | Solve | Medium | | |
| 822. Card Flipping Game | Solution | Solve | Medium | | |
| 823. Binary Trees With Factors | Solution | Solve | Medium | | |
| 825. Friends Of Appropriate Ages | Solution | Solve | Medium | | |
| 826. Most Profit Assigning Work | Solution | Solve | Medium | | |
| 831. Masking Personal Information | Solution | Solve | Medium | | |
| 833. Find And Replace in String | Solution | Solve | Medium | | |
| 835. Image Overlap | Solution | Solve | Medium | | |
| 837. New 21 Game | Solution | Solve | Medium | | |
| 838. Push Dominoes | Solution | Solve | Medium | | |
| 840. Magic Squares In Grid | Solution | Solve | Medium | | |
| 841. Keys and Rooms | Solution | Solve | Medium | | |
| 842. Split Array into Fibonacci Sequence | Solution | Solve | Medium | | |
| 845. Longest Mountain in Array | Solution | Solve | Medium | | |
| 846. Hand of Straights | Solution | Solve | Medium | | |
| 848. Shifting Letters | Solution | Solve | Medium | | |
| 849. Maximize Distance to Closest Person | Solution | Solve | Medium | | |
| 851. Loud and Rich | Solution | Solve | Medium | | |
| 852. Peak Index in a Mountain Array | Solution | Solve | Medium | | |
| 853. Car Fleet | Solution | Solve | Medium | | |
| 855. Exam Room | Solution | Solve | Medium | | |
| 856. Score of Parentheses | Solution | Solve | Medium | | |
| 858. Mirror Reflection | Solution | Solve | Medium | | |
| 861. Score After Flipping Matrix | Solution | Solve | Medium | | |
| 863. All Nodes Distance K in Binary Tree | Solution | Solve | Medium | | |
| 865. Smallest Subtree with all the Deepest Nodes | Solution | Solve | Medium | | |
| 866. Prime Palindrome | Solution | Solve | Medium | | |
| 869. Reordered Power of 2 | Solution | Solve | Medium | | |
| 870. Advantage Shuffle | Solution | Solve | Medium | | |
| 873. Length of Longest Fibonacci Subsequence | Solution | Solve | Medium | | |
| 874. Walking Robot Simulation | Solution | Solve | Medium | | |
| 875. Koko Eating Bananas | Solution | Solve | Medium | | |
| 877. Stone Game | Solution | Solve | Medium | | |
| 880. Decoded String at Index | Solution | Solve | Medium | | |
| 881. Boats to Save People | Solution | Solve | Medium | | |
| 885. Spiral Matrix III | Solution | Solve | Medium | | |
| 886. Possible Bipartition | Solution | Solve | Medium | | |
| 889. Construct Binary Tree from Preorder and Postorder Traversal | Solution | Solve | Medium | | |
| 890. Find and Replace Pattern | Solution | Solve | Medium | | |
| 893. Groups of Special-Equivalent Strings | Solution | Solve | Medium | | |
| 894. All Possible Full Binary Trees | Solution | Solve | Medium | | |
| 898. Bitwise ORs of Subarrays | Solution | Solve | Medium | | |
| 900. RLE Iterator | Solution | Solve | Medium | | |
