This repository contains a curated list of 75 LeetCode problems that are commonly known as the "Blind 75." These problems cover a wide range of data structures and algorithms and are frequently asked in technical interviews. Solving these problems can help you build a strong foundation in algorithmic problem-solving.
| Problem Name | Difficulty |
|---|---|
| 217. Contains Duplicate | Easy |
| 242. Valid Anagram | Easy |
| 1. Two Sum | Easy |
| 49. Group Anagrams | Medium |
| 347. Top K Frequent Elements | Medium |
| 238. Product of Array Except Self | Medium |
| 659. Encode and Decode Strings | Medium |
| 128. Longest Consecutive Sequence | Hard |
| Problem Name | Difficulty |
|---|---|
| 125. Valid Palindrome | Easy |
| 15. 3Sum | Medium |
| 11. Container With Most Water | Medium |
| Problem Name | Difficulty |
|---|---|
| 121. Best Time to Buy And Sell Stock | Easy |
| 3. Longest Substring Without Repeating Characters | Medium |
| 424. Longest Repeating Character Replacement | Medium |
| 76. Minimum Window Substring | Hard |
| Problem Name | Difficulty |
|---|---|
| 20. Valid Parentheses | Easy |
| Problem Name | Difficulty |
|---|---|
| 153. Find Minimum In Rotated Sorted Array | Medium |
| 33. Search In Rotated Sorted Array | Medium |
| Problem Name | Difficulty |
|---|---|
| 206. Reverse Linked List | Easy |
| 21. Merge Two Sorted Lists | Easy |
| 143. Reorder List | Medium |
| 19. Remove Nth Node From End of List | Medium |
| 141. Linked List Cycle | Medium |
| 23. Merge K Sorted Lists | Hard |
| Problem Name | Difficulty |
|---|---|
| 208. Implement Trie Prefix Tree | Medium |
| 211. Design Add And Search Words Data Structure | Medium |
| 212. Word Search II | Hard |
| Problem Name | Difficulty |
|---|---|
| 295. Find Median From Data Stream | Hard |
| Problem Name | Difficulty |
|---|---|
| 39. Combination Sum | Medium |
| 79. Word Search | Medium |
| Problem Name | Difficulty |
|---|---|
| 200. Number of Islands | Medium |
| 133. Clone Graph | Medium |
| 417. Pacific Atlantic Water Flow | Medium |
| 207. Course Schedule | Medium |
| 323. Number of Connected Components In An Undirected Graph | Medium |
| 261. Graph Valid Tree | Medium |
| Problem Name | Difficulty |
|---|---|
| 269. Alien Dictionary | Hard |
| Problem Name | Difficulty |
|---|---|
| 70. Climbing Stairs | Easy |
| 198. House Robber | Easy |
| 213. House Robber II | Medium |
| 5. Longest Palindromic Substring | Medium |
| 647. Palindromic Substrings | Medium |
| 91. Decode Ways | Medium |
| 322. Coin Change | Medium |
| 152. Maximum Product Subarray | Medium |
| 139. Word Break | Medium |
| 300. Longest Increasing Subsequence | Medium |
| Problem Name | Difficulty |
|---|---|
| 62. Unique Paths | Medium |
| 1143. Longest Common Subsequence | Medium |
| Problem Name | Difficulty |
|---|---|
| 53. Maximum Subarray | Easy |
| 55. Jump Game | Medium |
| Problem Name | Difficulty |
|---|---|
| 57. Insert Interval | Hard |
| 56. Merge Intervals | Medium |
| 435. Non Overlapping Intervals | Medium |
| 252. Meeting Rooms | Easy |
| 253. Meeting Rooms II | Medium |
| Problem Name | Difficulty |
|---|---|
| 48. Rotate Image | Medium |
| 54. Spiral Matrix | Medium |
| 73. Set Matrix Zeroes | Medium |
| Problem Name | Difficulty |
|---|---|
| 191. Number of 1 Bits | Easy |
| 338. Counting Bits | Medium |
| 190. Reverse Bits | Easy |
| 268. Missing Number | Easy |
| 371. Sum of Two Integers | Medium |
- Clone or download this repository to your local machine.
git clone https://github.com/mohsentabibian/LeetCode-Solutions/Blind-75-LeetCode.git- Navigate to the directory of the specific problem you want to solve.
cd Blind-75-LeetCode/Problem-Directory-
Open the problem's directory to find its description, code template, and solution(s).
-
Solve the problem using your preferred programming language.
-
Check the solution(s) provided in the directory for reference and to compare your solution.
If you have a better solution or want to add more problems to the collection, feel free to contribute. You can create a pull request or open an issue to discuss additions or improvements.
- LeetCode: The official LeetCode website.
- LeetCode Discuss: LeetCode's discussion forum for each problem. You can find helpful hints and discussions here.
This repository is meant for educational purposes and to help individuals prepare for technical interviews. Please respect LeetCode's terms of use and guidelines when using this repository.
We have a Code of Conduct that we expect all contributors to adhere to. By participating in this project, you agree to follow this code.
We take security seriously. Please review our Security Policy for information on reporting security vulnerabilities.
Happy coding!