LeetCode is a popular online platform for coding practice that offers a variety of problems to solve. Blind 75 LeetCode problems refer to a curated list of 75 LeetCode problems that are considered essential for cracking technical interviews at top-tier tech companies.
These problems are considered to be challenging, and solving them requires a thorough understanding of data structures and algorithms.
In this article, we will delve into the significance of the Blind 75 LeetCode problems and discuss tips for solving them.
Is Blind 75 Enough for FAANG?
Blind 75 covers the patterns FAANG interviews test, but it is not enough on its own. It gives you the pattern vocabulary. It does not give you speed under pressure, the habit of talking through your reasoning while you code, or any system design preparation. Treat Blind 75 as the foundation, then add timed mock interviews and a broader list such as NeetCode 150.
Blind 75 is a curated list of 75 LeetCode problems compiled by Yangshun Tay, a former Meta staff engineer and author of the Tech Interview Handbook, and shared on the Blind app around 2018. The list was chosen so that candidates could cover the patterns that recur in big-tech interviews without grinding through hundreds of random problems.
One detail most guides leave out: Tay stopped recommending Blind 75 in May 2022 and published Grind 75 as its successor, ordered by difficulty instead of grouped by topic. If you are starting from scratch today, that is worth knowing before you commit two months to the older list.
Table of Contents
Importance of Blind 75 LeetCode Problems
Cracking a technical interview at a top-tier tech company requires high proficiency in data structures and algorithms. The Blind 75 LeetCode problems are considered to be the gold standard for interview preparation because they cover a wide range of topics and provide a rigorous test of a candidate’s coding abilities.
These problems are designed to be challenging, and solving them requires a deep understanding of core computer science concepts.
Solving Blind 75 LeetCode problems also helps candidates to develop problem-solving skills and improve their coding efficiency.
These problems are not just meant to be solved but also to be optimized for time and space complexity.
Hence, solving these problems can significantly enhance candidates’ coding abilities and make themproblem solvers.
Tips for Solving Blind 75 LeetCode Problems
- Focus on the basics: Before attempting the Blind 75 LeetCode problems, it is essential to have a thorough understanding of the basic data structures and algorithms. Candidates should be comfortable with arrays, linked lists, trees, graphs, and sorting and searching algorithms.
- Practice regularly: Practice makes perfect, and regular practice of Blind 75 LeetCode problems can help candidates to develop problem-solving skills and improve their coding efficiency. Consistent practice also helps candidates to identify their strengths and weaknesses and work on them accordingly.
- Analyze the problem statement: Analyzing the problem statement carefully is crucial for solving Blind 75 LeetCode problems. Candidates should take their time to understand the problem statement and requirements before jumping into the coding process.
- Choose the right data structure: Choosing the right data structure is critical for solving Blind 75 LeetCode problems efficiently. Candidates should carefully analyze the problem statement and choose the most suitable data structure to solve the problem.
- Optimize for time and space complexity: Blind 75 LeetCode problems are not just meant to be solved but are also optimized for time and space complexity. Candidates should be familiar with techniques such as dynamic programming, memoization, and greedy algorithms to optimize their solutions.
- Test and debug: Testing and debugging are critical steps in solving Blind 75 LeetCode problems. Candidates should thoroughly test their code for various inputs and edge cases and debug any errors that arise.
Blind 75 LeetCode Questions
Array
- Two Sum
- Best Time to Buy and Sell Stock
- Contains Duplicate
- Product of Array Except Self
- Maximum Subarray
- Maximum Product Subarray
- Find Minimum in Rotated Sorted Array
- Search in Rotated Sorted Array
- 3 Sum
- Container With Most Water
Binary
Dynamic Programming
- Climbing Stairs
- Coin Change
- Longest Increasing Subsequence
- Longest Common Subsequence
- Word Break Problem
- Combination Sum
- House Robber
- House Robber II
- Decode Ways
- Unique Paths
- Jump Game
Graph
- Clone Graph
- Course Schedule
- Pacific Atlantic Water Flow
- Number of Islands
- Longest Consecutive Sequence
- Alien Dictionary (Leetcode Premium)
- Graph Valid Tree (Leetcode Premium)
- Number of Connected Components in an Undirected Graph (Leetcode Premium)
Interval
- Insert Interval
- Merge Intervals
- Non-overlapping Intervals
- Meeting Rooms (Leetcode Premium)
- Meeting Rooms II (Leetcode Premium)
Linked List
- Reverse a Linked List
- Detect Cycle in a Linked List
- Merge Two Sorted Lists
- Merge K Sorted Lists
- Remove Nth Node From End Of List
- Reorder List
Matrix
String
- Longest Substring Without Repeating Characters
- Longest Repeating Character Replacement
- Minimum Window Substring
- Valid Anagram
- Group Anagrams
- Valid Parentheses
- Valid Palindrome
- Longest Palindromic Substring
- Palindromic Substrings
- Encode and Decode Strings (Leetcode Premium)
Tree
- Maximum Depth of Binary Tree
- Same Tree
- Invert/Flip Binary Tree
- Binary Tree Maximum Path Sum
- Binary Tree Level Order Traversal
- Serialize and Deserialize Binary Tree
- Subtree of Another Tree
- Construct Binary Tree from Preorder and Inorder Traversal
- Validate Binary Search Tree
- Kth Smallest Element in a BST
- Lowest Common Ancestor of BST
- Implement Trie (Prefix Tree)
- Add and Search Word
- Word Search II
Heap
Conclusion
Blind 75 LeetCode problems are essential to technical interview preparation, and solving them can significantly improve a candidate’s coding abilities. These problems are designed to be challenging, and solving them requires a deep understanding of data structures and algorithms.
By following the tips mentioned above and practicing regularly, candidates can develop problem-solving skills and improve their coding efficiency, ultimately enhancing their chances of cracking a technical interview at a top-tier tech company.
Blind 75 vs Grind 75 vs NeetCode 150
| Feature | Blind 75 | Grind 75 | NeetCode 150 |
|---|---|---|---|
| Problem count | 75, fixed | 75 by default, expandable to 169 | 150 |
| Created by | Yangshun Tay | Yangshun Tay | NeetCode |
| Ordering | Grouped by topic | Ordered by difficulty | Topic roadmap |
| Study schedule | None | Customisable, 8 to 26 weeks | None |
| Video solutions | No | No | Yes |
| Best for | Fast revision of core patterns | Preparing to a deadline | Deeper coverage and repetition |
Frequently Asked Questions
Is Blind 75 enough for FAANG?
Blind 75 covers the core patterns but not the whole interview. It prepares you for the algorithmic round; it does not cover system design, behavioural questions, or solving under time pressure while explaining your thinking. Most candidates use it as a base and add mock interviews on top.
What is Blind 75 in LeetCode?
Blind 75 is a list of 75 LeetCode problems selected to cover the main patterns tested in big-tech coding interviews, such as arrays, dynamic programming, graphs and trees. It was compiled by Yangshun Tay and shared on the Blind app around 2018.
How long does it take to complete Blind 75?
At two to three problems a day, most people finish in four to eight weeks. If you are new to data structures and algorithms, expect longer, because understanding a pattern properly matters far more than ticking off problems quickly.
How much LeetCode should I do per day?
Two to three problems a day is a sustainable pace for most working candidates. Consistency beats volume: solving two problems daily and revisiting them beats twenty problems in one weekend that you never look at again.
Should I do Blind 75 or Grind 75?
Grind 75 is the newer list from the same author, ordered by difficulty and built around a schedule you set. Blind 75 is smaller and grouped by topic, which suits fast revision. If you are starting fresh with a deadline, Grind 75 is usually the better fit.
