This repository contains Python solutions to the NeetCode 150 problems - a curated list of LeetCode questions designed to help you ace the coding interviews! 💻
The solutions are organized by problem categories to make it easier to focus on specific areas. Each solution includes a link to the LeetCode problem and, when available, a link to a video explanation.
These solutions were adapted from the freeCodeCamp article on NeetCode 150 and refactored into this organized format. The original Java solutions were converted to Python.
| # | Problem | Solution | Video |
|---|---|---|---|
| 1 | Two Sum | Solution | Video |
| 49 | Group Anagrams | Solution | Video |
| 347 | Top K Frequent Elements | Solution | Video |
| 242 | Valid Anagram | Solution | Video |
| 953 | Verifying an Alien Dictionary | Solution | Video |
| # | Problem | Solution | Video |
|---|---|---|---|
| 15 | 3Sum | Solution | Video |
| 125 | Valid Palindrome | Solution | Video |
| # | Problem | Solution | Video |
|---|---|---|---|
| 3 | Longest Substring Without Repeating Characters | Solution | Video |
| 121 | Best Time to Buy and Sell Stock | Solution | Video |
| # | Problem | Solution | Video |
|---|---|---|---|
| 20 | Valid Parentheses | Solution | Video |
| 32 | Longest Valid Parentheses | Solution | Video |
| 150 | Evaluate Reverse Polish Notation | Solution | Video |
| 853 | Car Fleet | Solution | Video |
| 1249 | Minimum Remove to Make Valid Parentheses | Solution | Video |
| # | Problem | Solution | Video |
|---|---|---|---|
| 33 | Search in Rotated Sorted Array | Solution | Video |
| 153 | Find Minimum in Rotated Sorted Array | Solution | Video |
| 875 | Koko Eating Bananas | Solution | Video |
| 74 | Search a 2D Matrix | Solution | Video |
| 704 | Binary Search | Solution | Video |
| 34 | Find First and Last Position of Element in Sorted Array | Solution | Video |
| # | Problem | Solution | Video |
|---|---|---|---|
| 21 | Merge Two Sorted Lists | Solution | Video |
| 25 | Reverse Nodes in k-Group | Solution | Video |
| 138 | Copy List with Random Pointer | Solution | Video |
| 143 | Reorder List | Solution | Video |
| 148 | Sort List | Solution | Video |
| 141 | Linked List Cycle | Solution | Video |
| 24 | Swap Nodes in Pairs | Solution | Video |
| # | Problem | Solution | Video |
|---|---|---|---|
| 621 | Task Scheduler | Solution | Video |
| 973 | K Closest Points to Origin | Solution | Video |
| 1046 | Last Stone Weight | Solution | Video |
| 1851 | Minimum Interval to Include Each Query | Solution | Video |
| # | Problem | Solution | Video |
|---|---|---|---|
| 127 | Word Ladder | Solution | Video |
| 130 | Surrounded Regions | Solution | Video |
| 133 | Clone Graph | Solution | Video |
| 210 | Course Schedule II | Solution | Video |
| 286 | Walls and Gates | Solution | Video |
| 332 | Reconstruct Itinerary | Solution | Video |
| 547 | Number of Provinces | Solution | Video |
| 759 | Employee Free Time | Solution | Video |
| 778 | Swim in Rising Water | Solution | Video |
| 994 | Rotting Oranges | Solution | Video |
| 269 | Alien Dictionary | Solution | Video |
| 695 | Max Area of Island | Solution | Video |
| 329 | Longest Increasing Path in a Matrix | Solution | Video |
| # | Problem | Solution | Video |
|---|---|---|---|
| 5 | Longest Palindromic Substring | Solution | Video |
| 70 | Climbing Stairs | Solution | Video |
| 115 | Distinct Subsequences | Solution | Video |
| 152 | Maximum Product Subarray | Solution | Video |
| 312 | Burst Balloons | Solution | Video |
| 416 | Partition Equal Subset Sum | Solution | Video |
| 494 | Target Sum | Solution | Video |
| 818 | Race Car | Solution | Video |
| 1143 | Longest Common Subsequence | Solution | Video |
| 62 | Unique Paths | Solution | Video |
| 45 | Jump Game II | Solution | Video |
| # | Problem | Solution | Video |
|---|---|---|---|
| 134 | Gas Station | Solution | Video |
| 763 | Partition Labels | Solution | Video |
| # | Problem | Solution | Video |
|---|---|---|---|
| 22 | Generate Parentheses | Solution | Video |
| 46 | Permutations | Solution | Video |
| 51 | N-Queens | Solution | Video |
| 79 | Word Search | Solution | Video |
| 90 | Subsets II | Solution | Video |
| 131 | Palindrome Partitioning | Solution | Video |
| # | Problem | Solution | Video |
|---|---|---|---|
| 31 | Next Permutation | Solution | Video |
| 50 | Pow(x, n) | Solution | Video |
| 66 | Plus One | Solution | Video |
| 68 | Text Justification | Solution | Video |
| 73 | Set Matrix Zeroes | Solution | Video |
| 88 | Merge Sorted Array | Solution | Video |
| 179 | Largest Number | Solution | Video |
| 287 | Find the Duplicate Number | Solution | Video |
| 54 | Spiral Matrix | Solution | Video |
| 48 | Rotate Image | Solution | Video |
| 36 | Valid Sudoku | Solution | Video |
| 289 | Game of Life | Solution | Video |
| 7 | Reverse Integer | Solution | Video |
| 9 | Palindrome Number | Solution | Video |
| # | Problem | Solution | Video |
|---|---|---|---|
| 56 | Merge Intervals | Solution | Video |
| 57 | Insert Interval | Solution | Video |
| 435 | Non-overlapping Intervals | Solution | Video |
| # | Problem | Solution | Video |
|---|---|---|---|
| 146 | LRU Cache | Solution | Video |
| 380 | Insert Delete GetRandom O(1) | Solution | Video |
| 981 | Time Based Key-Value Store | Solution | Video |
| 2013 | Detect Squares | Solution | Video |
- Navigate to the category you're interested in
- Pick a problem and review the solution
- If available, watch the video explanation for deeper understanding
- Try implementing the solution yourself before checking the code
This repository is available under the MIT License.