BlackBuck Software Development Engineer 1 Interview Questions and Answers

There were 2 DSA questions.
One was a variation of Kadane's Algorithm and the other one was related to binary trees.

Q1. All CS Fundamentals(OOPS, OS, DBMS, CN)
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Q2. Find binary tree if preorder and postorder is given.
Ans. 
To find binary tree from preorder and postorder, use recursion and divide the arrays into left and right subtrees.
• Create a binary tree node using the first element of preorder array

• Find the root node's index in postorder array

• Divide the arrays into left and right subtrees recursively
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Q3. Discussion about the OA questions.
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Q1. Projects Discussion and Resume Discussion, some CS questions.
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Q2. Word Break question from Leetcode.
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Q3. Some questions on sorting techniques.
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1 hr coding text on hackerearth

Q1. Cannot disclose
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Q1. Cannot disclose
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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
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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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Q1. Machine coding on Order Management System
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Q2. Java related advance questions
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Q1. Healthy discussion on designing a system
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Q2. Managerial questions
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Q1. Scenario based questions like How did you handle a situation where your colleague was unresponsive on something
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Q2. Scenario based questions like What were the positive and constructive feedbacks you got from your manager
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Q1. The question was about Nodejs
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Q2. The question was to build a linked list in Nodejs
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Q1. The first question was related to DSA
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Q2. The question was related to SQL
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Q1. MVVM, Android Related
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Q2. Diffrence between mvvm/ mvc
Ans. 
MVVM focuses on separation of concerns between UI, business logic, and data layers, while MVC separates application into model, view, and controller.
• MVVM stands for Model-View-ViewModel, where ViewModel acts as a mediator between View and Model.

• MVVM is commonly used in WPF and Xamarin applications.

• MVC stands for Model-View-Controller, where Controller handles user input, Model manages data, and View displays informatio...read more
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