| 851. Loud and Rich | Solution | Solve | Medium | | |
| 852. Peak Index in a Mountain Array | Solution | Solve | Medium | | |
| 853. Car Fleet | Solution | Solve | Medium | | |
| 854. K-Similar Strings | Solution | Solve | Hard | | |
| 855. Exam Room | Solution | Solve | Medium | | |
| 856. Score of Parentheses | Solution | Solve | Medium | | |
| 857. Minimum Cost to Hire K Workers | Solution | Solve | Hard | | |
| 858. Mirror Reflection | Solution | Solve | Medium | | |
| 859. Buddy Strings | Solution | Solve | Easy | | |
| 860. Lemonade Change | Solution | Solve | Easy | | |
| 861. Score After Flipping Matrix | Solution | Solve | Medium | | |
| 862. Shortest Subarray with Sum at Least K | Solution | Solve | Hard | | |
| 863. All Nodes Distance K in Binary Tree | Solution | Solve | Medium | | |
| 864. Shortest Path to Get All Keys | Solution | Solve | Hard | | |
| 865. Smallest Subtree with all the Deepest Nodes | Solution | Solve | Medium | | |
| 866. Prime Palindrome | Solution | Solve | Medium | | |
| 867. Transpose Matrix | Solution | Solve | Easy | | |
| 868. Binary Gap | Solution | Solve | Easy | | |
| 869. Reordered Power of 2 | Solution | Solve | Medium | | |
| 870. Advantage Shuffle | Solution | Solve | Medium | | |
| 871. Minimum Number of Refueling Stops | Solution | Solve | Hard | | |
| 872. Leaf-Similar Trees | Solution | Solve | Easy | | |
| 873. Length of Longest Fibonacci Subsequence | Solution | Solve | Medium | | |
| 874. Walking Robot Simulation | Solution | Solve | Medium | | |
| 875. Koko Eating Bananas | Solution | Solve | Medium | | |
| 876. Middle of the Linked List | Solution | Solve | Easy | | |
| 877. Stone Game | Solution | Solve | Medium | | |
| 878. Nth Magical Number | Solution | Solve | Hard | | |
| 879. Profitable Schemes | Solution | Solve | Hard | | |
| 880. Decoded String at Index | Solution | Solve | Medium | | |
| 881. Boats to Save People | Solution | Solve | Medium | | |
| 882. Reachable Nodes In Subdivided Graph | Solution | Solve | Hard | | |
| 883. Projection Area of 3D Shapes | Solution | Solve | Easy | | |
| 884. Uncommon Words from Two Sentences | Solution | Solve | Easy | | |
| 885. Spiral Matrix III | Solution | Solve | Medium | | |
| 886. Possible Bipartition | Solution | Solve | Medium | | |
| 887. Super Egg Drop | Solution | Solve | Hard | | |
| 888. Fair Candy Swap | Solution | Solve | Easy | | |
| 889. Construct Binary Tree from Preorder and Postorder Traversal | Solution | Solve | Medium | | |
| 890. Find and Replace Pattern | Solution | Solve | Medium | | |
| 891. Sum of Subsequence Widths | Solution | Solve | Hard | - | |
| 892. Surface Area of 3D Shapes | Solution | Solve | Easy | | |
| 893. Groups of Special-Equivalent Strings | Solution | Solve | Medium | | |
| 894. All Possible Full Binary Trees | Solution | Solve | Medium | | |
| 895. Maximum Frequency Stack | Solution | Solve | Hard | | |
| 896. Monotonic Array | Solution | Solve | Easy | | |
| 897. Increasing Order Search Tree | Solution | Solve | Easy | | |
| 898. Bitwise ORs of Subarrays | Solution | Solve | Medium | | |
| 899. Orderly Queue | Solution | Solve | Hard | | |
| 900. RLE Iterator | Solution | Solve | Medium | | |
