| Group Anagrams ↗ | Medium | Array, Hash Table, String | |
| LRU Cache ↗ | Medium | Hash Table, Linked List, Design | |
| Longest Substring Without Repeating Characters ↗ | Medium | Hash Table, String, Sliding Window | |
| Majority Element ↗ | Easy | Array, Hash Table, Divide and Conquer | |
| Special Binary String ↗ | Hard | String, Divide and Conquer, Sorting | |
| Binary Tree Maximum Path Sum ↗ | Hard | Dynamic Programming, Tree, Depth-First Search | |
| Add Two Numbers ↗ | Medium | Linked List, Math, Recursion | |
| Median of Two Sorted Arrays ↗ | Hard | Array, Binary Search, Divide and Conquer | |
| 3Sum ↗ | Medium | Array, Two Pointers, Sorting | |
| Reverse Linked List ↗ | Easy | Linked List, Recursion | |
| Climbing Stairs ↗ | Easy | Math, Dynamic Programming, Memoization | |
| Merge Intervals ↗ | Medium | Array, Sorting | |
| Kth Largest Element in a Stream ↗ | Easy | Tree, Design, Binary Search Tree | |
| Add Digits ↗ | Easy | Math, Simulation, Number Theory | |
| Delete Node in a Linked List ↗ | Medium | Linked List | |
| Tenth Line ↗ | Easy | Shell | |
| Plates Between Candles ↗ | Medium | Array, String, Binary Search | |
| Two Sum ↗ | Easy | Array, Hash Table | |
| Largest Number ↗ | Medium | Array, String, Greedy | |
| Is Subsequence ↗ | Easy | Two Pointers, String, Dynamic Programming | |
| Gas Station ↗ | Medium | Array, Greedy | |
| Basic Calculator II ↗ | Medium | Math, String, Stack | |
| Minimum Cost For Tickets ↗ | Medium | Array, Dynamic Programming | |
| Flatten Nested List Iterator ↗ | Medium | Stack, Tree, Depth-First Search | |
| Number of Islands ↗ | Medium | Array, Depth-First Search, Breadth-First Search | |
| Minimum Window Substring ↗ | Hard | Hash Table, String, Sliding Window | |
| Best Time to Buy and Sell Stock ↗ | Easy | Array, Dynamic Programming | |
| Trapping Rain Water ↗ | Hard | Array, Two Pointers, Dynamic Programming | |
| Next Permutation ↗ | Medium | Array, Two Pointers | |
| Jump Game ↗ | Medium | Array, Dynamic Programming, Greedy | |
| Integer to Roman ↗ | Medium | Hash Table, Math, String | |
| Validate IP Address ↗ | Medium | String | |
| Longest Common Prefix ↗ | Easy | Array, String, Trie | |
| Longest Palindromic Substring ↗ | Medium | Two Pointers, String, Dynamic Programming | |
| Valid Parentheses ↗ | Easy | String, Stack | |
| Maximum Product Subarray ↗ | Medium | Array, Dynamic Programming | |
| Sort Array by Increasing Frequency ↗ | Easy | Array, Hash Table, Sorting | |
| Spiral Matrix ↗ | Medium | Array, Matrix, Simulation | |
| Koko Eating Bananas ↗ | Medium | Array, Binary Search | |
| Top K Frequent Elements ↗ | Medium | Array, Hash Table, Divide and Conquer | |