Coding Interview Resources

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Leetcode patterns you should definitely checkout to Learn DSA(Java) from scratch 1️⃣ Arrays: Data structures, such as arrays, store elements in contiguous memory locations. They are versatile and useful for a wide variety of purposes. LeetCode Problems: • Search in Rotated Sorted Array (Problem #33) • Product of Array Except Self (Problem #238) • Find the Missing Number (Problem #268) 2️⃣Two Pointers: In Two Pointers, two pointers are maintained in the collection and can be manipulated to solve a problem efficiently. LeetCode problems: • Trapping Rain Water (Problem #42) • Longest Substring Without Repeating Characters (Problem #3) • Squares of a Sorted Array (Problem #977) 3️⃣In-place Linked List Traversal: As an explanation, in-place traversal is a technique for modifying linked list nodes without using extra space. LeetCode Problems: • Remove Nth Node From End of List (Problem #19) • Reorder List (Problem #143) 4️⃣Fast & Slow Pointers: This pattern uses two pointers to traverse a sequence at different speeds (fast and slow), often used to detect cycles or find a specific position in the sequence. LeetCode Problems: • Happy Number (Problem #202) • Subarray Sum Equals K (Problem #560) • Intersection of Two Linked Lists (Problem #160) 5️⃣Merge Intervals: This pattern involves merging overlapping intervals in a collection, often used in problems dealing with intervals or ranges. LeetCode problems: • Non-overlapping Intervals (Problem #435) • Minimum Number of Arrows to Burst Balloons (Problem #452) Join for more: https://t.me/crackingthecodinginterview DSA Interview Preparation Resources: https://topmate.io/coding/886874 ENJOY LEARNING 👍👍

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Here is how you can explain your project in an interview When you’re in an interview, it’s super important to know how to talk about your projects in a way that impresses the interviewer. Here are some key points to help you do just that: ➤ 𝗣𝗿𝗼𝗷𝗲𝗰𝘁 𝗢𝘃𝗲𝗿𝘃𝗶𝗲𝘄: - Start with a quick summary of the project you worked on. What was it all about? What were the main goals? Keep it short and sweet something you can explain in about 30 seconds. ➤ 𝗣𝗿𝗼𝗯𝗹𝗲𝗺 𝗦𝘁𝗮𝘁𝗲𝗺𝗲𝗻𝘁: - What problem were you trying to solve with this project? Explain why this problem was important and needed addressing. ➤ 𝗣𝗿𝗼𝗽𝗼𝘀𝗲𝗱 𝗦𝗼𝗹𝘂𝘁𝗶𝗼𝗻: - Describe the solution you came up with. How does it work, and why is it a good fix for the problem? ➤ 𝗬𝗼𝘂𝗿 𝗥𝗼𝗹𝗲: - Talk about what you specifically did. What were your main tasks? Did you face any challenges, and how did you overcome them? Make sure it’s clear whether you were leading the project, a key player, or supporting the team. ➤ 𝗧𝗲𝗰𝗵𝗻𝗼𝗹𝗼𝗴𝗶𝗲𝘀 𝗮𝗻𝗱 𝗧𝗼𝗼𝗹𝘀: - Mention the tech and tools you used. This shows your technical know-how and your ability to choose the right tools for the job. ➤ 𝗜𝗺𝗽𝗮𝗰𝘁 𝗮𝗻𝗱 𝗔𝗰𝗵𝗶𝗲𝘃𝗲𝗺𝗲𝗻𝘁𝘀: - Share the results of your project. Did it make things better? How? Mention any improvements, efficiencies, or positive feedback you got. This helps show the project was a success and highlights your contribution. ➤ 𝗧𝗲𝗮𝗺 𝗖𝗼𝗹𝗹𝗮𝗯𝗼𝗿𝗮𝘁𝗶𝗼𝗻: - If you worked with a team, talk about how you collaborated. What was your role in the team? How did you communicate and contribute to the team’s success? ➤ 𝗟𝗲𝗮𝗿𝗻𝗶𝗻𝗴 𝗮𝗻𝗱 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗺𝗲𝗻𝘁: - Reflect on what you learned from the project. How did it help you grow professionally? What new skills did you gain, and what would you do differently next time? ➤ 𝗧𝗶𝗽𝘀 𝗳𝗼𝗿 𝗬𝗼𝘂𝗿 𝗜𝗻𝘁𝗲𝗿𝘃𝗶𝗲𝘄 𝗣𝗿𝗲𝗽𝗮𝗿𝗮𝘁𝗶𝗼𝗻: - Be ready with a 30 second elevator pitch about your projects, and also have a five-minute detailed overview ready. - Know why you chose the project, what your role was, what decisions you made, and how the results compared to what you expected. - Be clear on the scope of the project whether it was a long-term effort or a quick task. - If there’s a pause after you describe the project, don’t hesitate to ask if they’d like more details or if there’s a specific part they’re interested in. Remember, 𝗰𝗼𝗺𝗺𝘂𝗻𝗶𝗰𝗮𝘁𝗶𝗼𝗻 𝗶𝘀 𝗸𝗲𝘆. You might have done great work, but if you don’t explain it well, it’s hard for the interviewer to understand your impact. So, practice explaining your projects with clarity.

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Junior Developer: - I will never learn if I rely on Chatgpt. Maybe I can try writing this code on my own? Mid Level Developer - I'll only turn to chatGPT when I'm really stuck Senior Developer - How many R's are in the word strawberry?

How to approach a DSA problem: 𝟭. 𝗧𝗶𝗺𝗲 𝗯𝗼𝗺𝗯: - Read the problem two times. Solve the examples using pen and paper and check if your answers match. Calculate the time complexity and see if it matches the constraints. If your algorithm approach is correct, attempt the question. If not, you have 45 minutes – set a timer and move to the next step. 𝟮. 𝗙𝗶𝗻𝗱 𝘁𝗵𝗲 𝗿𝗶𝗴𝗵𝘁 𝘀𝗼𝗹𝘂𝘁𝗶𝗼𝗻: - Go to the discussion section and check the top solutions. Look for a solution that will help you get the job, not a fancy or exotic one. Focus on a simple approach, study it properly, and you’ll start seeing patterns. Use that pattern and implement the solution. 𝟯. 𝗜𝗱𝗲𝗻𝘁𝗶𝗳𝘆 𝘁𝗵𝗲 𝗽𝗮𝘁𝘁𝗲𝗿𝗻: - Solve the suggested problems. This way, you’ll learn multiple patterns. DSA works on patterns, not just learning. Focus on basic problems to improve your pattern recognition and then solve more problems related to that pattern to clear your concepts. 𝟰. 𝗟𝗲𝗲𝘁𝗰𝗼𝗱𝗲 𝟴𝟬/𝟮𝟬 𝗿𝘂𝗹𝗲: - Solve the 20% of problems that are asked in 80% of interviews. Use Blind 75 or Neetcode 150. Check the company-specific discussion forums on Leetcode to see which questions are being asked recently. Focus on those questions, especially around common topics like graphs or dynamic programming, because companies tend to repeat similar questions. This will help you prepare better. 𝟱. 𝗙𝗼𝗰𝘂𝘀 𝗼𝗻 𝗾𝘂𝗮𝗹𝗶𝘁𝘆, 𝗻𝗼𝘁 𝗾𝘂𝗮𝗻𝘁𝗶𝘁𝘆: - Solve quality questions that will help clarify your fundamentals. Copy-pasting solutions won’t help. Jump to medium-level questions, as most interview questions are of medium difficulty. Aim for 65% accuracy, and once you reach that, move on to harder questions. This will build your confidence and improve your problem-solving skills. Best DSA RESOURCES: https://topmate.io/coding/886874 All the best 👍👍

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Important topics of Object Oriented Programming System 1. Classes and Objects: -> Basics of defining classes and creating objects. -> Class members: attributes (properties) and methods (functions). 2. Inheritance: -> Creating a new class by inheriting properties and methods from an existing class. -> Superclasses (base classes) and subclasses (derived classes). 3. Polymorphism: -> Ability to take multiple forms. -> Method overriding and method overloading. 4. Encapsulation: -> Hiding the internal details of a class and providing a controlled interface. -> Access modifiers: public, private, protected. 5. Abstraction: -> Simplifying complex reality by modeling classes based on real-world entities. -> Abstract classes and interfaces. 6. Constructors and Destructors: -> Special methods for initializing and cleaning up objects. -> Constructor overloading. 7. Method Access and Modifiers: -> Public, private, protected, and package-private access modifiers. -> Static methods and variables. A few advanced topics :- Composition and Aggregation: Combining objects to create more complex structures. Has-a and Is-a relationships. Object Relationships: Association, aggregation, and composition. One-to-one, one-to-many, and many-to-many relationships. Interfaces: Defining contracts that classes must adhere to. Multiple interface implementation. Polymorphic Behavior: Achieving flexibility through polymorphism. Method overriding and dynamic method binding. Inheritance vs. Composition: Comparing and choosing between inheritance and object composition. Design Patterns: Common solutions to recurring design problems. Examples: Singleton, Factory, Observer, etc. Exception Handling: Handling errors and exceptions gracefully in OOP. Try-catch blocks. Object Serialization: Converting objects into a format suitable for storage or transmission. Reading and writing objects to/from files. Garbage Collection: Automatic memory management to reclaim unused memory. Mark and sweep, reference counting, and generations. UML (Unified Modeling Language): A visual language for modeling software systems. Class diagrams, sequence diagrams, and use cases. Method Overriding vs. Method Overloading: Understanding the differences between these two concepts. Abstract Classes vs. Interfaces: Comparing and contrasting abstract classes and interfaces in OOP. Encapsulation Benefits: Discussing the advantages of encapsulation, such as data protection and code organization. P.S - These are just the name of topics which you should be aware of. You can get enough articles on every topic just on a Google search. Best DSA RESOURCES: https://topmate.io/coding/886874 All the best 👍👍

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Here is how you can explain your project in an interview When you’re in an interview, it’s super important to know how to talk about your projects in a way that impresses the interviewer. Here are some key points to help you do just that: ➤ 𝗣𝗿𝗼𝗷𝗲𝗰𝘁 𝗢𝘃𝗲𝗿𝘃𝗶𝗲𝘄: - Start with a quick summary of the project you worked on. What was it all about? What were the main goals? Keep it short and sweet something you can explain in about 30 seconds. ➤ 𝗣𝗿𝗼𝗯𝗹𝗲𝗺 𝗦𝘁𝗮𝘁𝗲𝗺𝗲𝗻𝘁: - What problem were you trying to solve with this project? Explain why this problem was important and needed addressing. ➤ 𝗣𝗿𝗼𝗽𝗼𝘀𝗲𝗱 𝗦𝗼𝗹𝘂𝘁𝗶𝗼𝗻: - Describe the solution you came up with. How does it work, and why is it a good fix for the problem? ➤ 𝗬𝗼𝘂𝗿 𝗥𝗼𝗹𝗲: - Talk about what you specifically did. What were your main tasks? Did you face any challenges, and how did you overcome them? Make sure it’s clear whether you were leading the project, a key player, or supporting the team. ➤ 𝗧𝗲𝗰𝗵𝗻𝗼𝗹𝗼𝗴𝗶𝗲𝘀 𝗮𝗻𝗱 𝗧𝗼𝗼𝗹𝘀: - Mention the tech and tools you used. This shows your technical know-how and your ability to choose the right tools for the job. ➤ 𝗜𝗺𝗽𝗮𝗰𝘁 𝗮𝗻𝗱 𝗔𝗰𝗵𝗶𝗲𝘃𝗲𝗺𝗲𝗻𝘁𝘀: - Share the results of your project. Did it make things better? How? Mention any improvements, efficiencies, or positive feedback you got. This helps show the project was a success and highlights your contribution. ➤ 𝗧𝗲𝗮𝗺 𝗖𝗼𝗹𝗹𝗮𝗯𝗼𝗿𝗮𝘁𝗶𝗼𝗻: - If you worked with a team, talk about how you collaborated. What was your role in the team? How did you communicate and contribute to the team’s success? ➤ 𝗟𝗲𝗮𝗿𝗻𝗶𝗻𝗴 𝗮𝗻𝗱 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗺𝗲𝗻𝘁: - Reflect on what you learned from the project. How did it help you grow professionally? What new skills did you gain, and what would you do differently next time? ➤ 𝗧𝗶𝗽𝘀 𝗳𝗼𝗿 𝗬𝗼𝘂𝗿 𝗜𝗻𝘁𝗲𝗿𝘃𝗶𝗲𝘄 𝗣𝗿𝗲𝗽𝗮𝗿𝗮𝘁𝗶𝗼𝗻: - Be ready with a 30 second elevator pitch about your projects, and also have a five-minute detailed overview ready. - Know why you chose the project, what your role was, what decisions you made, and how the results compared to what you expected. - Be clear on the scope of the project whether it was a long-term effort or a quick task. - If there’s a pause after you describe the project, don’t hesitate to ask if they’d like more details or if there’s a specific part they’re interested in. You can check these resources for Coding interview Preparation Like for more 👍👍

Type of problem, while solving DSA problem in Array ❗ There are many types of problems that can be solved using arrays and different techniques in Data Structures and Algorithms. Here are some common problem types and techniques that you might encounter: 𝟏. 𝐒𝐥𝐢𝐝𝐢𝐧𝐠 𝐰𝐢𝐧𝐝𝐨𝐰 𝐩𝐫𝐨𝐛𝐥𝐞𝐦𝐬: In these problems, you are given an array and a window size, and you have to find a subarray of that size that satisfies certain conditions. You can use a sliding window technique to efficiently search through the array by maintaining a current window of fixed size and updating it as you move forward. 𝟐. 𝐓𝐰𝐨 𝐩𝐨𝐢𝐧𝐭𝐞𝐫 𝐩𝐫𝐨𝐛𝐥𝐞𝐦𝐬: In these problems, you use two pointers to traverse the array from both ends and find a certain pattern or condition. For example, you can use two pointers to find a pair of elements that sum up to a target value, or to reverse an array. 𝟑. 𝐒𝐨𝐫𝐭𝐢𝐧𝐠 𝐩𝐫𝐨𝐛𝐥𝐞𝐦𝐬: In these problems, you are asked to sort an array in a certain way, such as in ascending or descending order, or according to certain criteria such as frequency or value. You can use sorting algorithms such as merge sort or quick sort to efficiently sort the array. 𝟒. 𝐒𝐞𝐚𝐫𝐜𝐡𝐢𝐧𝐠 𝐩𝐫𝐨𝐛𝐥𝐞𝐦𝐬: In these problems, you are asked to find a specific element in the array or to search for a certain pattern. You can use searching algorithms such as binary search or linear search to efficiently search through the array. 𝟓. 𝐒𝐮𝐛𝐚𝐫𝐫𝐚𝐲 𝐩𝐫𝐨𝐛𝐥𝐞𝐦𝐬: In these problems, you are asked to find a contiguous subarray that satisfies certain conditions. You can use techniques such as prefix sum or Kadane's algorithm to efficiently find the subarray with the maximum sum. 𝟔. 𝐂𝐨𝐮𝐧𝐭𝐢𝐧𝐠 𝐩𝐫𝐨𝐛𝐥𝐞𝐦𝐬: In these problems, you are asked to count the occurrences of certain elements or to count the number of subarrays or subsequences that satisfy certain conditions. You can use techniques such as hashing or dynamic programming to efficiently count the occurrences or number of subarrays. Best DSA RESOURCES: https://topmate.io/coding/886874 All the best 👍👍

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Tips for Google Interview Preparation Understand the work culture at Google well - It is always good to understand how the company works and what are the things that are expected out of an employee at Google. This shows that you are really interested in working at Google and leaves a good impression on the interviewer as well. Be Thorough with Data Structures and Algorithms - At Google, there is always an appreciation for good problem solvers. If you want to have a good impression on the interviewers, the best way is to prove that you have worked a lot on developing your logic structures and solving algorithmic problems. A good understanding of Data Structures and Algorithms and having one or two good projects always earn you brownie points with Amazon. Use the STAR method to format your Response - STAR is an acronym for Situation, Task, Action, and Result. The STAR method is a structured way to respond to behavioral based interview questions. To answer a provided question using the STAR method, you start by describing the situation that was at hand, the Task which needed to be done, the action taken by you as a response to the Task, and finally the Result of the experience. It is important to think about all the details and recall everyone and everything that was involved in the situation. Let the interviewer know how much of an impact that experience had on your life and in the lives of all others who were involved. It is always a good practice to be prepared with a real-life story that you can describe using the STAR method. Know and Describe your Strengths - Many people who interview at various companies, stay shy during the interviews and feel uncomfortable when they are asked to describe their strengths. Remember that if you do not show how good you are at the skills you know, no one will ever be able to know about the same and this might just cost you a lot. So it is okay to think about yourself and highlight your strengths properly and honestly as and when required. Discuss with your interviewer and keep the conversation going - Remember that an interview is not a written exam and therefore even if you come up with the best of solutions for the given problems, it is not worth anything until and unless the interviewer understands what you are trying to say. Therefore, it is important to make the interviewer that he or she is also a part of the interview. Also, asking questions might always prove to be helpful during the interview. Best DSA RESOURCES: https://topmate.io/coding/886874 All the best 👍👍