I had attempted these in C# and JavaScript but alas, my career decided I was going to lead with Python so hwere we are!
Source for the following list of challenges: https://www.techinterviewhandbook.org/best-practice-questions/
Free source for learning to solve challenges - https://neetcode.io
| py ☐ | cs ☑ | 1 | Two Sum | py cs | Easy |
| py ☐ | cs ☑ | 2 | Contains Duplicate | py cs | Easy |
| py ☐ | cs ☑ | 3 | Best Time to Buy and Sell Stock | py cs | Easy |
| py ☐ | cs ☑ | 4 | Valid Anagram | py cs | Easy |
| py ☐ | cs ☑ | 5 | Valid Parentheses | py cs | Easy |
| py ☐ | cs ☑ | 6 | Maximum Subarray | py cs | Easy |
| py ☐ | cs ☑ | 7 | Product of Array Except Self | py cs | Medium |
| py ☐ | cs ☑ | 8 | 3Sum | py cs | Medium |
| py ☐ | cs ☐ | 9 | Merge Intervals | Medium | |
| py ☐ | cs ☐ | 10 | Group Anagrams | Medium |
| py ☐ | cs ☐ | 11 | Reverse a Linked List | Easy | |
| py ☐ | cs ☐ | 12 | Detect Cycle in a Linked List | Easy | |
| py ☐ | cs ☐ | 13 | Container With Most Water | Medium | |
| py ☐ | cs ☐ | 14 | Find Minimum in Rotated Sorted Array | Medium | |
| py ☐ | cs ☐ | 15 | Longest Repeating Character Replacement | Medium | |
| py ☐ | cs ☐ | 16 | Longest Substring Without Repeating Characters | Medium | |
| py ☐ | cs ☐ | 17 | Number of Islands | Medium | |
| py ☐ | cs ☐ | 18 | Remove Nth Node From End Of List | Medium | |
| py ☐ | cs ☐ | 19 | Longest Palindromic Substring | Medium | |
| py ☐ | cs ☐ | 20 | Pacific Atlantic Water Flow | Medium | |
| py ☐ | cs ☐ | 21 | Minimum Window Substring | Hard |
| py ☐ | cs ☐ | 22 | Invert/Flip Binary Tree | Easy | |
| py ☐ | cs ☐ | 23 | Validate Binary Search Tree | Medium | |
| py ☐ | cs ☐ | 24 | Non-overlapping Intervals | Medium | |
| py ☐ | cs ☐ | 25 | Construct Binary Tree from Preorder and Inorder Traversal | Medium | |
| py ☐ | cs ☐ | 26 | Top K Frequent Elements | Medium | |
| py ☐ | cs ☐ | 27 | Clone Graph | Medium | |
| py ☐ | cs ☐ | 28 | Course Schedule | Medium | |
| py ☐ | cs ☐ | 29 | Serialize and Deserialize Binary Tree | Hard | |
| py ☐ | cs ☐ | 30 | Binary Tree Maximum Path Sum | Hard |
| py ☐ | cs ☐ | 31 | Subtree of Another Tree | Easy | |
| py ☐ | cs ☐ | 32 | Lowest Common Ancestor of BST | Easy | |
| py ☐ | cs ☐ | 33 | [Implement Trie (Prefix Tree)](https://leetcode.com/problems/ | ||
| py ☐ | cs ☐ | 34 | Add and Search Word | Medium | |
| py ☐ | cs ☐ | 35 | Kth Smallest Element in a BST | Medium | |
| py ☐ | cs ☐ | 36 | Merge K Sorted Lists | Hard | |
| py ☐ | cs ☐ | 37 | Find Median from Data Stream | Hard | |
| py ☐ | cs ☐ | 38 | Insert Interval | ||
| py ☐ | cs ☐ | 39 | Longest Consecutive Sequence | Medium | |
| py ☐ | cs ☐ | 40 | Word Search II | Hard |
| py ☐ | cs ☐ | 41 | Climbing Stairs | Easy | |
| py ☐ | cs ☐ | 42 | Coin Change | Medium | |
| py ☐ | cs ☐ | 43 | Longest Increasing Subsequence | Medium | |
| py ☐ | cs ☐ | 44 | Combination Sum | Medium | |
| py ☐ | cs ☐ | 45 | House Robber | Medium | |
| py ☐ | cs ☐ | 46 | House Robber II | ||
| py ☐ | cs ☐ | 47 | Decode Ways | Medium | |
| py ☐ | cs ☐ | 48 | Unique Paths | ||
| py ☐ | cs ☐ | 49 | Jump Game | Medium | |
| py ☐ | cs ☐ | 50 | Word Break Problem | Medium |