| Walls and Gates ↗ | Medium | Array, Breadth-First Search, Matrix | |
| Binary Tree Maximum Path Sum ↗ | Hard | Dynamic Programming, Tree, Depth-First Search | |
| Single-Threaded CPU ↗ | Medium | Array, Sorting, Heap (Priority Queue) | |
| Maximum Profit in Job Scheduling ↗ | Hard | Array, Binary Search, Dynamic Programming | |
| Search Suggestions System ↗ | Medium | Array, String, Binary Search | |
| Koko Eating Bananas ↗ | Medium | Array, Binary Search | |
| Longest Increasing Path in a Matrix ↗ | Hard | Array, Dynamic Programming, Depth-First Search | |
| 132 Pattern ↗ | Medium | Array, Binary Search, Stack | |
| Design File System ↗ | Medium | Hash Table, String, Design | |
| Buddy Strings ↗ | Easy | Hash Table, String | |
| Find K Closest Elements ↗ | Medium | Array, Two Pointers, Binary Search | |
| Making A Large Island ↗ | Hard | Array, Depth-First Search, Breadth-First Search | |
| Basic Calculator III ↗ | Hard | Math, String, Stack | |
| Interval List Intersections ↗ | Medium | Array, Two Pointers, Sweep Line | |
| Immediate Food Delivery II ↗ | Medium | Database | |
| Course Schedule II ↗ | Medium | Depth-First Search, Breadth-First Search, Graph Theory | |
| Implement Trie (Prefix Tree) ↗ | Medium | Hash Table, String, Design | |
| 01 Matrix ↗ | Medium | Array, Dynamic Programming, Breadth-First Search | |
| Vertical Order Traversal of a Binary Tree ↗ | Hard | Hash Table, Tree, Depth-First Search | |
| Two Sum ↗ | Easy | Array, Hash Table | |
| Next Permutation ↗ | Medium | Array, Two Pointers | |
| Largest Rectangle in Histogram ↗ | Hard | Array, Stack, Monotonic Stack | |
| Basic Calculator ↗ | Hard | Math, String, Stack | |
| Minimum Size Subarray Sum ↗ | Medium | Array, Binary Search, Sliding Window | |
| Max Area of Island ↗ | Medium | Array, Depth-First Search, Breadth-First Search | |
| Longest Common Subsequence ↗ | Medium | String, Dynamic Programming | |
| Basic Calculator II ↗ | Medium | Math, String, Stack | |
| Serialize and Deserialize Binary Tree ↗ | Hard | String, Tree, Depth-First Search | |
| Asteroid Collision ↗ | Medium | Array, Stack, Simulation | |
| Word Search II ↗ | Hard | Array, String, Backtracking | |
| Number of Islands ↗ | Medium | Array, Depth-First Search, Breadth-First Search | |
| Course Schedule ↗ | Medium | Depth-First Search, Breadth-First Search, Graph Theory | |
| Sliding Window Maximum ↗ | Hard | Array, Queue, Sliding Window | |
| Merge Intervals ↗ | Medium | Array, Sorting | |
| LRU Cache ↗ | Medium | Hash Table, Linked List, Design | |
| 4Sum ↗ | Medium | Array, Two Pointers, Sorting | |
| Jump Game ↗ | Medium | Array, Dynamic Programming, Greedy | |
| Swim in Rising Water ↗ | Hard | Array, Binary Search, Depth-First Search | |
| Insert Delete GetRandom O(1) ↗ | Medium | Array, Hash Table, Math | |
| Integer to Roman ↗ | Medium | Hash Table, Math, String | |