| 795 | Number of Subarrays with Bounded Maximum | ArrayTwo Pointers | Medium |
| 797 | All Paths From Source to Target | BacktrackingDepth-First SearchBreadth-First Search+1 | Medium |
| 799 | Champagne Tower | Dynamic Programming | Medium |
| 802 | Find Eventual Safe States | Depth-First SearchBreadth-First SearchGraph+1 | Medium |
| 807 | Max Increase to Keep City Skyline | ArrayGreedyMatrix | Medium |
| 808 | Soup Servings | MathDynamic ProgrammingProbability and Statistics | Medium |
| 809 | Expressive Words | ArrayTwo PointersString | Medium |
| 811 | Subdomain Visit Count | ArrayHash TableString+1 | Medium |
| 813 | Largest Sum of Averages | ArrayDynamic ProgrammingPrefix Sum | Medium |
| 814 | Binary Tree Pruning | TreeDepth-First SearchBinary Tree | Medium |
| 816 | Ambiguous Coordinates | StringBacktrackingEnumeration | Medium |
| 817 | Linked List Components | ArrayHash TableLinked List | Medium |
| 820 | Short Encoding of Words | ArrayHash TableString+1 | Medium |
| 822 | Card Flipping Game | ArrayHash Table | Medium |
| 823 | Binary Trees With Factors | ArrayHash TableDynamic Programming+1 | Medium |
| 825 | Friends Of Appropriate Ages | ArrayTwo PointersBinary Search+1 | Medium |
| 826 | Most Profit Assigning Work | ArrayTwo PointersBinary Search+2 | Medium |
| 831 | Masking Personal Information | String | Medium |
| 833 | Find And Replace in String | ArrayHash TableString+1 | Medium |
| 835 | Image Overlap | ArrayMatrix | Medium |
| 837 | New 21 Game | MathDynamic ProgrammingSliding Window+1 | Medium |
| 838 | Push Dominoes | Two PointersStringDynamic Programming | Medium |
| 840 | Magic Squares In Grid | ArrayHash TableMath+1 | Medium |
| 841 | Keys and Rooms | Depth-First SearchBreadth-First SearchGraph | Medium |
| 842 | Split Array into Fibonacci Sequence | StringBacktracking | Medium |
| 845 | Longest Mountain in Array | ArrayTwo PointersDynamic Programming+1 | Medium |
| 846 | Hand of Straights | ArrayHash TableGreedy+1 | Medium |
| 848 | Shifting Letters | ArrayStringPrefix Sum | Medium |
| 849 | Maximize Distance to Closest Person | Array | Medium |
| 851 | Loud and Rich | ArrayDepth-First SearchGraph+1 | Medium |
| 852 | Peak Index in a Mountain Array | ArrayBinary Search | Medium |
| 853 | Car Fleet | ArrayStackSorting+1 | Medium |
| 855 | Exam Room | DesignHeap (Priority Queue)Ordered Set | Medium |
| 856 | Score of Parentheses | StringStack | Medium |
| 858 | Mirror Reflection | MathGeometryNumber Theory | Medium |
| 861 | Score After Flipping Matrix | ArrayGreedyBit Manipulation+1 | Medium |
| 863 | All Nodes Distance K in Binary Tree | Hash TableTreeDepth-First Search+2 | Medium |
| 865 | Smallest Subtree with all the Deepest Nodes | Hash TableTreeDepth-First Search+2 | Medium |
| 866 | Prime Palindrome | MathNumber Theory | Medium |
| 869 | Reordered Power of 2 | Hash TableMathSorting+2 | Medium |
| 870 | Advantage Shuffle | ArrayTwo PointersGreedy+1 | Medium |
| 873 | Length of Longest Fibonacci Subsequence | ArrayHash TableDynamic Programming | Medium |
| 874 | Walking Robot Simulation | ArrayHash TableSimulation | Medium |
| 875 | Koko Eating Bananas | ArrayBinary Search | Medium |
| 877 | Stone Game | ArrayMathDynamic Programming+1 | Medium |
| 880 | Decoded String at Index | StringStack | Medium |
| 881 | Boats to Save People | ArrayTwo PointersGreedy+1 | Medium |
| 885 | Spiral Matrix III | ArrayMatrixSimulation | Medium |
| 886 | Possible Bipartition | Depth-First SearchBreadth-First SearchUnion Find+1 | Medium |
| 889 | Construct Binary Tree from Preorder and Postorder Traversal | ArrayHash TableDivide and Conquer+2 | Medium |