BlackBuck Software Development Engineer Intern Interview Questions and Answers

Q1. What is encapsulation in OOP?
Ans. 
Encapsulation is the concept of bundling data and methods together within a class, hiding internal details from the outside world.
• Encapsulation helps in achieving data abstraction and data hiding.

• It allows for better control over the access to the internal state of an object.

• By encapsulating data, we can protect it from being modified by external code.

• Encapsulation promotes code reusability and maintainability.

• Example:...read more
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Q1. Tree question dsa
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Q2. Fibonacci sequence question
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Q1. LRU Cache - how to tackle
Ans. 
LRU Cache is a data structure that maintains a list of items in order of most recently used to least recently used.
• Implement using a doubly linked list and a hashmap for efficient operations

• When an item is accessed, move it to the front of the list

• When the cache is full, remove the least recently used item from the end of the list
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Q2. LRU Cache implementation based on a real time system. How would the main work which will be called etc etc
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Easy level to Medium level

2 Easy questions of DSA

Q1. One DSA question
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Q2. Normal discussion about tech stack
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Q1. Tell about yourself
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Q2. Why do you want to join digit?
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Easy to medium questions, Questions on DSA and Node.js.

Q1. Valid parenthesis
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Q2. Three sum problem
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It was a coding round where i need to solve 3 DSA Questions in 1.5 hour

Q1. This is Technical round where i was asked to implement the Two Question of Dsa one is bases on greedy and another is dp , another one is leetcode hard (finding maxaimal area of rectangle in matrix of 1 and...read more
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Q2. Greedy Q was direct i don't remember clearly. I was selected for the 2nd round
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Q1. It was also a technical round but bases on LLD problem statement. I was given a problem statement to design a society security system and the they need psudo code for complete implementation using correct ...read more
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Q1. I was not selected for 4th round but heard that there were Q on cs fundamentals.
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It was an online assessment. Some coding questions. Some cs fundamental mcqs. SQL query, Rest Api question.

An assignment to create a game using nodejs/ go lang/ java.

Q1. Discussion related to Assignment. Told some changes and told to add some more functionalities.
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Q2. Some APIS were given. It was case study. You had to show the dishes to a customer according to his preferences.
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