VassarLabs Interview Questions and Answers

Q1. Can you provide details about the projects listed on your resume?
Ans. 
I have worked on various projects including a social media platform, an e-commerce website, and a task management application.
• Developed a social media platform using React for frontend and Node.js for backend

• Designed and implemented an e-commerce website with payment gateway integration

• Created a task management application using Angular and MongoDB for database
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Q2. What are the main concepts of Object-Oriented Programming (OOP)?
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Main concepts of OOP include encapsulation, inheritance, polymorphism, and abstraction.
• Encapsulation: Bundling data and methods that operate on the data into a single unit (object).

• Inheritance: Creating new classes based on existing classes, allowing for code reuse.

• Polymorphism: Objects of different classes can be treated as objects of a common superclass.

• Abstraction: Hiding complex implementation details and showing o...read more
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Java, Object-Oriented Programming (OOP), SQL, and coding.

Q1. Stack Implementation
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Q2. Valid parentheses check
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Q1. What's is dependency tree in maven. What is spring boot. Questions on my resume and my current company work. 1. Create and print Left view of binary tree
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Q2. What is exception handling and indepth on it. Questions about my current company project. Scenario based questions about thread synchronisation. How does java internally deals with synchronise blocks. 1. I...read more
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Q1. Rotate the array by k times
Ans. 
Rotate an array to the right by k positions, modifying the original array.
• To rotate an array, elements are shifted to the right by k positions.

• Example: For array [1, 2, 3, 4, 5] and k=2, the result is [4, 5, 1, 2, 3].

• Use modulo operation: k = k % array.length to handle cases where k > array.length.

• Consider edge cases: If k is 0 or equal to the array length, the array remains unchanged.

• In-place rotation can be achiev...read more
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Q2. Loop detection in linked list
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Loop detection in a linked list identifies if a cycle exists using efficient algorithms.
• Use Floyd's Cycle Detection Algorithm (Tortoise and Hare) to find loops.

• Initialize two pointers: slow moves one step, fast moves two steps.

• If pointers meet, a loop exists; if fast pointer reaches null, no loop.

• Example: In a list 1 -> 2 -> 3 -> 4 -> 2 (loop back to 2), pointers will meet at 2.
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