| 3Sum | Medium | |
| Add and Search Word | Medium | |
| Alien Dictionary | Hard | |
| Best Time to Buy and Sell Stock | Easy | |
| Binary Tree Level Order Traversal | Medium | |
| Binary Tree Maximum Path Sum | Hard | |
| Climbing Stairs | Easy | |
| Clone Graph | Medium | |
| Coin Change | Medium | |
| Combination Sum | Medium | |
| Construct Binary Tree from Preorder and Inorder Traversal | Medium | |
| Container With Most Water | Medium | |
| Contains Duplicate | Easy | |
| Counting Bits | Easy | |
| Course Schedule | Medium | |
| Decode Ways | Medium | |
| Detect Cycle in a Linked List | Easy | |
| Encode and Decode Strings | Medium | |
| Find Median from Data Stream | Hard | |
| Find Minimum in Rotated Sorted Array | Medium | |
| Graph Valid Tree | Medium | |
| Group Anagrams | Medium | |
| House Robber | Medium | |
| House Robber II | Medium | |
| Implement Trie (Prefix Tree) | Medium | |
| Insert Interval | Medium | |
| Invert Binary Tree | Easy | |
| Jump Game | Medium | |
| Kth Smallest Element in a BST | Medium | |
| Longest Common Subsequence | Medium | |
| Longest Consecutive Sequence | Medium | |
| Longest Increasing Subsequence | Medium | |
| Longest Palindromic Substring | Medium | |
| Longest Repeating Character Replacement | Medium | |
| Longest Substring Without Repeating Characters | Medium | |
| Lowest Common Ancestor of BST | Medium | |
| Maximum Depth of Binary Tree | Easy | |
| Maximum Product Subarray | Medium | |
| Maximum Subarray | Medium | |
| Meeting Rooms | Easy | |
| Meeting Rooms II | Medium | |
| Merge Intervals | Medium | |
| Merge K Sorted Lists | Hard | |
| Merge Two Sorted Lists | Easy | |
| Minimum Window Substring | Hard | |
| Missing Number | Easy | |
| Non-overlapping Intervals | Medium | |
| Number of 1 Bits | Easy | |
| Number of Connected Components in an Undirected Graph | Medium | |
| Number of Islands | Medium | |
| Pacific Atlantic Water Flow | Medium | |
| Palindromic Substrings | Medium | |
| Product of Array Except Self | Medium | |
| Remove Nth Node From End Of List | Medium | |
| Reorder List | Medium | |
| Reverse a Linked List | Easy | |
| Reverse Bits | Easy | |
| Rotate Image | Medium | |
| Same Tree | Easy | |
| Search in Rotated Sorted Array | Medium | |
| Serialize and Deserialize Binary Tree | Hard | |
| Set Matrix Zeroes | Medium | |
| Spiral Matrix | Medium | |
| Subtree of Another Tree | Easy | |
| Sum of Two Integers | Medium | |
| Top K Frequent Elements | Medium | |
| Two Sum | Easy | |
| Unique Paths | Medium | |
| Valid Anagram | Easy | |
| Validate Binary Search Tree | Medium | |
| Valid Palindrome | Easy | |
| Valid Parentheses | Easy | |
| Word Break Problem | Medium | |
| Word Search | Medium | |
| Word Search II | Hard | |