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