Are you looking to crack the coding interview and land your dream job in the tech industry? If so, you must have come across the famous Blind 75list, which is quite popular among the software engineering community. The list features a curated collection of 75 LeetCode questions that are frequently asked in technical interviews at big tech companies like Google, Amazon, Facebook, and Microsoft. The Blind 75 list helps you dedicate your preparation time effectively and ace the interview with confidence.
In this tutorial, we will provide an in-depth guide to understanding the Blind 75, help you make the most of the LeetCode platform, and share best practices to enable you to solve the problems efficiently. By the end, you will be familiar with the concepts and have a better grasp of the essential steps necessary for solving the LeetCode Blind 75 using dynamic programming and bst. Programmers can benefit from this tutorial as it provides a comprehensive guide to solving the Blind 75 problems efficiently.
What are the Blind 75 LeetCode Questions?
As mentioned earlier, the Blind 75 list is a compilation of 75 LeetCode questions that software engineers deem essential for mastering interview problems in the tech industry. The list covers some of the most common problem categories, including arrays, strings, linked lists, trees, graphs, and dynamic programming. Each question is hand-picked based on its frequency of occurrence in past interviews and relevance to the targeted roles. The Blind 75 list is a great resource for anyone looking to improve their skills in solving leetcode questions during technical interviews. In addition, understanding the concept of linked list is crucial for solving many of the problems in the Blind 75 LeetCode List.
I’ve organized the Blind 75 LeetCode questions into a 8-week plan with the LeetCode question name, difficulty, and link provided. Each week focuses on specific topics and data structures to allow for a systematic and comprehensive preparation process. This is a curated list that will help you prepare for your coding interviews efficiently.
Week 1:
In the first week of Blind 75, our focus will be on solving beginner-level questions that are relatively easy. This week is crucial because it establishes a strong foundation for the upcoming weeks and helps you gain a thorough understanding of fundamental concepts. Solving these initial problems will enhance your problem-solving skills and prepare you for more challenging tasks in the future.
It is important to remember that the primary objective of Week 1 is not only to solve the provided questions but also to cultivate a problem-solving mindset. Keep a positive outlook and do not feel discouraged if you encounter difficulties along the way. Every question that you answer is an opportunity for growth and will contribute to your development as a developer, thus, preparing you for your interview journey.
| # | Questions | Difficulty | Estimated Time |
|---|---|---|---|
| 1. | Two Sum | Easy | 15 mins |
| 2. | Valid Parentheses | Easy | 20 mins |
| 3. | Merge Two Sorted Lists | Easy | 20 mins |
| 4. | Best Time to Buy and Sell Stock | Easy | 20 mins |
| 5. | Valid Palindrome | Easy | 15 mins |
| 6. | Invert Binary Tree | Easy | 15 mins |
| 7. | Valid Anagram | Easy | 15 mins |
| 8. | Binary Search | Easy | 15 mins |
| 9. | Flood Fill | Easy | 20 mins |
| 10. | Lowest Common Ancestor of a Binary Search Tree | Easy | 20 mins |
| 11. | Balanced Binary Tree | Easy | 15 mins |
| 12. | Linked List Cycle | Easy | 20 mins |
| 13. | Implement Queue using Stacks | Easy | 20 mins |
Week 2:
In week 2, we will be transitioning from easy to medium-level challenges. The goal here is to gradually increase the difficulty level of the challenges so that you can gradually build your skills and confidence.
We will start by revisiting some of the easy challenges from week 1 with slight modifications to make them slightly more difficult. For example, if one of the challenges in week 1 involved printing out the first 10 even numbers, in week 2 we might modify it to print out the first 20 even numbers.
Once you have gotten comfortable with these slightly more difficult challenges, we will start introducing new challenges that are at a medium level of difficulty. These challenges will be more complex and require a bit more problem-solving skills, but they will still be achievable with the skills you have learned so far.
As always, we will provide plenty of guidance and support to help you through these challenges. Remember, the key to success is to keep practicing and never give up!
| # | Question | Difficulty | Estimated Time |
|---|---|---|---|
| 1. | First Bad Version | Easy | 20 mins |
| 2. | Ransom Note | Easy | 15 mins |
| 3. | Climbing Stairs | Easy | 20 mins |
| 4. | Longest Palindrome | Easy | 20 mins |
| 5. | Reverse Linked List | Easy | 20 mins |
| 6. | Majority Element | Easy | 20 mins |
| 7. | Add Binary | Easy | 15 mins |
| 8. | Diameter of Binary Tree | Easy | 30 mins |
| 9. | Middle of the Linked List | Easy | 20 mins |
| 10. | Maximum Depth of Binary Tree | Easy | 15 mins |
| 11. | Contains Duplicate | Easy | 15 mins |
| 12. | Maximum Subarray | Medium | 20 mins |
Week 3:
Welcome back! It’s great to have you here as we continue our Blind 75 journey. Congratulations on reaching Week 3! This week, we’ll be diving into medium-level questions. Remember, even if you encounter some roadblocks along the way, don’t lose hope. Take a moment to seek out solutions and strive to understand the underlying concepts. With that said, let’s get started on this week’s challenges.
| # | Question | Difficulty | Estimated Time |
|---|---|---|---|
| 1 | Insert Interval | Medium | 25 mins |
| 2 | 01 Matrix | Medium | 30 mins |
| 3 | K Closest Points to Origin | Medium | 30 mins |
| 4 | Longest Substring Without Repeating Characters | Medium | 30 mins |
| 5 | 3Sum | Medium | 30 mins |
| 6 | Binary Tree Level Order Traversal | Medium | 20 mins |
| 7 | Clone Graph | Medium | 25 mins |
| 8 | Evaluate Reverse Polish Notation | Medium | 30 mins |
Week 4:
In the week 4, the questions are more challenging and require more advanced knowledge from the previous weeks. These types of questions often come up in interviews, so it is important to be prepared. Additionally, this week provides an opportunity to practice using more complex data structures, including but not limited to heaps and tries, which may not be as commonly used but are still relevant for interviews.
| # | Questions | Difficulty | Estimated Time |
|---|---|---|---|
| 1. | Course Schedule | Medium | 30 mins |
| 2. | Implement Trie (Prefix Tree) | Medium | 35 mins |
| 3. | Coin Change | Medium | 25 mins |
| 4. | Product of Array Except Self | Medium | 30 mins |
| 5. | Min Stack | Medium | 20 mins |
| 6. | Validate Binary Search Tree | Medium | 20 mins |
| 7. | Number of Islands | Medium | 25 mins |
| 8. | Rotting Oranges | Medium | 30 mins |
Week 5:
As we reach the midway point of our Blind 75 expedition, we are filled with a sense of confidence from all that we have learned. Now, we must maintain this positive energy and embrace Week 5 with open arms, prepared to face fresh obstacles and tackle further personal development.
| # | Questions | Difficulty | Estimated Time |
|---|---|---|---|
| 1. | Search in Rotated Sorted Array | Medium | 30 mins |
| 2. | Combination Sum | Medium | 30 mins |
| 3. | Permutations | Medium | 30 mins |
| 4. | Merge Intervals | Medium | 30 mins |
| 5. | Lowest Common Ancestor of a Binary Tree | Medium | 25 mins |
| 6. | Time-Based Key-Value Store | Medium | 35 mins |
| 7. | Accounts Merge | Medium | 30 mins |
| 8. | Sort Colors | Medium | 25 mins |
Week 6:
Let’s dive into what this week has in store for you. You’re entering the sixth week of your Blind 75 endeavor, and you’ve already gotten used to the daily pattern of code. We realize that this routine can be tough, but don’t give up because the benefits you’ll reap are well worth the effort. Let’s explore what’s on the agenda for this week.
| # | Questions | Difficulty | Estimated Time |
|---|---|---|---|
| 1. | Word Break | Medium | 30 mins |
| 2. | Partition Equal Subset Sum | Medium | 30 mins |
| 3. | String to Integer (atoi) | Medium | 25 mins |
| 4. | Spiral Matrix | Medium | 25 mins |
| 5. | Subsets | Medium | 30 mins |
| 6. | Binary Tree Right Side View | Medium | 20 mins |
| 7. | Longest Palindromic Substring | Medium | 25 mins |
| 8. | Unique Paths | Medium | 20 mins |
| 9. | Construct Binary Tree from Preorder and Inorder Traversal | Medium | 25 mins |
Week 7:
Great job on finishing more than 50 questions in the last six weeks! Your commitment and perseverance are truly commendable. Nevertheless, our adventure is far from over. It’s time to step up and keep pushing forward. So, without any more delay, let’s jump back into the captivating universe of Blind 75!
| # | Question | Difficulty | Estimated Time |
|---|---|---|---|
| 1. | Container With Most Water | Medium | 35 mins |
| 2. | Letter Combinations of a Phone Number | Medium | 30 mins |
| 3. | Word Search | Medium | 30 mins |
| 4. | Find All Anagrams in a String | Medium | 30 mins |
| 5. | Minimum Height Trees | Medium | 30 mins |
| 6. | Task Scheduler | Medium | 35 mins |
| 7. | LRU Cache | Medium | 30 mins |
Week 8:
Greetings as we enter the last week of the Blind 75 journey! We are thrilled to present you with a series of difficult questions that will test your ability to solve complex problems. Get ready to face a challenging lineup because this week’s set of questions is tailored to push your boundaries and enhance your proficiency in DSA.
In the final week, we have put together a compilation of intricate LeetCode problems that require critical thinking and an in-depth understanding of complex algorithms. These questions are meant to test your grasp of data structures, algorithms, and their practical applications. Although the questions may appear overwhelming at first, each one you conquer is an opportunity for advancement and education.
| # | Questions | Difficulty | Estimated Time |
|---|---|---|---|
| 1. | Kth Smallest Element in a BST | Medium | 25 mins |
| 2. | Minimum Window Substring | Hard | 30 mins |
| 3. | Serialize and Deserialize Binary Tree | Hard | 40 mins |
| 4. | Trapping Rain Water | Hard | 35 mins |
| 5. | Find Median from Data Stream | Hard | 30 mins |
| 6. | Word Ladder | Hard | 45 mins |
| 7. | Basic Calculator | Hard | 40 mins |
| 8. | Maximum Profit in Job Scheduling | Hard | 45 mins |
| 9. | Merge k Sorted Lists | Hard | 30 mins |
| 10. | Largest Rectangle in Histogram | Hard | 35 mins |
How to Prepare for Blind 75
Preparing for Blind 75 LeetCode questions can be challenging, especially if you aren’t comfortable with leetcode questions or practicing coding interview questions. However, there are ways to make it easier. For example, instead of directly attempting Blind 75 LeetCode questions, start by practicing individual questions from different companies on various topics such as matrices or linked lists. Additionally, building a strong foundation in data structures and algorithms is crucial when preparing for Blind 75. Online resources like LeetCode premium or even public review platforms like Quora can provide tips on the best way to grind and mash techniques together. Don’t forget that persistence and consistent practicing are essential in the coding interview scene.
How to Get Started with the Blind 75 List
Here are some simple steps to help you start practicing the Blind 75 LeetCode questions:
- Sign up on LeetCode.com if you haven’t already. A basic account is entirely free and allows you to access most of the platform features.
- Head over to the above Blind 75 LeetCode Questions curated list.
- Skim through the list of questions and familiarize yourself with the problem categories.
- Select a question to start with, based on your preference or familiarity.
- Read the problem statement carefully, paying attention to constraints, edge cases, and specific requirements.
- Attempt to solve the problem using the integrated code editor using your preferred programming language.
- Test your code against the provided test cases and any new test cases you come up with.
- Once you’re confident in your solution, submit your code and review its performance.
- Check the discussion forums to understand other people’s solutions, optimizations, and ideas.
- Repeat the process for other questions from the list.
Tips and Best Practices for Tackling the Blind 75 LeetCode Questions
Here are some helpful tips to make your Blind 75 LeetCode experience more efficient and enjoyable:
- Regular practice: Consistency is key when preparing for coding interviews. Set aside dedicated time to work on the questions daily, and try to maintain a steady pace.
- Categorize the questions: Group questions based on their themes or problem types. Understanding the core concepts behind each category helps tackle similar questions more easily.
- Analyze your mistakes: Every time you make a mistake, spend time analyzing what went wrong and how you can improve. This approach ensures long-term retention and prevents repetitive mistakes.
- Track your progress: Maintain a log of completed questions, noting down the lessons learned along the way. Tracking your progress helps you stay motivated and recognize patterns in your learning.
- Timed practice: Simulate the real interview environment by solving problems under timed conditions. This approach not only increases your speed but also helps you manage stress and think more clearly under pressure.
- Discuss and learn: Contribute to the discussion forums or join study groups to share insights, ask questions, and receive feedback from peers. Collaborative learning helps you gain new perspectives and improves problem-solving skills.
- Master the fundamentals: One of the essential success factors for cracking coding interviews lies in having a strong understanding of data structures, algorithms, and programming concepts. Invest time in acquiring these skills and practicing them regularly.
Conclusion
The Blind 75 LeetCode questions are a fantastic resource to help you efficiently prepare for software engineering interviews at top tech companies. By following the steps, tips, and best practices outlined in this tutorial, you will be on your way to conquering the coding interview with confidence and securing a bright future in the tech industry. Remember, practice makes perfect, so keep honing your skills and leave no stone unturned in your quest for success!
