BlueStacks Software Developer Intern Interview Questions and Answers

Q1. Write a program to check if string is a anagram
Ans. 
Program to check if a string is an anagram
• Create a function that takes in two strings as input

• Remove all spaces and convert both strings to lowercase

• Sort both strings and compare if they are equal to determine if they are anagrams
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Q2. What is react lifecycle method
Ans. 
React lifecycle methods are special methods that are automatically called by React at specific points in a component's life cycle.
• React components have several lifecycle methods such as componentDidMount, componentDidUpdate, componentWillUnmount, etc.

• These methods allow developers to perform actions at specific points in a component's life cycle, such as fetching data, updating the UI, or cleaning up resources.

• Understa...read more
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Create a web app to perform cred operation

General aptitude questions

Abstract topic group discussion

Q1. Technical interview covering topics on oops , data structures , conditional statements.
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Q1. General questions- introduction , how previous rounds went ,hobbies , what do you know about our company , situation based questions.
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Few questions that would involve problem solving. Basic 10th std math would suffice

Had few DSA questions.

Q1. Technical interview
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Q1. About job, expection etc
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Simple question on maths

Q1. Explain OOPS concept
Ans. 
OOPS (Object-Oriented Programming) is a programming paradigm based on the concept of objects, which can contain data and code.
• OOPS focuses on creating objects that interact with each other to solve complex problems

• Key principles include encapsulation, inheritance, polymorphism, and abstraction

• Encapsulation ensures that the internal state of an object is hidden from the outside world

• Inheritance allows a class to inherit...read more
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Q2. Coding array questions
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Q1. Can you provide an introduction about yourself?
Ans. 
I'm a passionate software engineer with a strong background in full-stack development and a love for solving complex problems.
• Education: Bachelor's degree in Computer Science from XYZ University.

• Experience: 3 years of experience in developing web applications using React and Node.js.

• Projects: Developed an e-commerce platform that increased sales by 30% within the first quarter.

• Skills: Proficient in JavaScript, Python, ...read more
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Q2. What qualifications have you obtained, and can you explain the project you completed during your engineering studies?
Ans. 
I hold a Bachelor's degree in Computer Engineering and developed a web-based project for managing student records.
• Bachelor's degree in Computer Engineering from XYZ University.

• Completed a capstone project on a web application for student record management.

• Utilized technologies like HTML, CSS, JavaScript, and Node.js.

• Implemented features such as user authentication, data visualization, and a responsive design.

• Collaborat...read more
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Q1. Why do you believe this company is a suitable fit for you?
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Q2. Do you have any questions
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Q1. Introduce yourself
Ans. 
I am a software developer with 5 years of experience in Java, Python, and SQL.
• 5 years of experience in Java, Python, and SQL

• Strong problem-solving skills

• Experience working in Agile development environment
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Q2. Short term goals
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Round duration - 90 minutes
Round difficulty - Medium

Timing was 10AM. The platform was user-friendly.

Q1. 
Maximum Size Rectangle Sub-matrix with All 1's Problem Statement
You are provided with an N * M sized binary matrix 'MAT' where 'N' denotes the number of rows and 'M' denotes the number of columns. Your t...read more
Ans. 
Find the maximum area of a submatrix with all 1's in a binary matrix.
• Iterate over each cell in the matrix and calculate the maximum area of submatrix with that cell as the top-left corner.

• Use dynamic programming to keep track of the maximum width of 1's ending at each cell.

• Update the maximum area as you iterate through the matrix.

• Return the maximum area found.
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Q2. 
Binary Tree Maximum Path Sum Problem Statement
Determine the maximum path sum for any path in a given binary tree with 'N' nodes.
Note:
• A 'path' is defined as any sequence of adjacent nodes connected...read more
Ans. 
Find the maximum path sum in a binary tree with 'N' nodes.
• Traverse the binary tree to find the maximum path sum.

• Keep track of the maximum sum encountered so far.

• Consider all possible paths in the tree to find the maximum sum.

• Example: For input 1 2 3 4 -1 5 6 -1 -1 -1 -1 -1 -1, the maximum path sum is 16.
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Q3. 
Minimum Number of Swaps to Sort an Array
Find the minimum number of swaps required to sort a given array of distinct elements in ascending order.
Input:
T (number of test cases)
For each test case:
N (siz...read more
Ans. 
Find the minimum number of swaps required to sort an array of distinct elements in ascending order.
• Use graph theory to solve the problem by considering each element as a node and edges representing the swaps needed to sort the array

• Implement a graph-based approach like cycle detection to find the minimum number of swaps required

• Consider using an efficient sorting algorithm like bubble sort or selection sort to minimize
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Q4. 
Prefix to Infix Conversion
Transform a string representing a valid Prefix expression, which may contain operators '+', '-', '*', '/', and uppercase letters, into its corresponding Infix expression.
Examp...read more
Ans. 
Convert a valid Prefix expression to its corresponding Infix expression.
• Use a stack to store operands and operators while traversing the prefix expression from right to left.

• Pop operands from the stack and form the infix expression by placing them between corresponding operators.

• Handle the precedence of operators to ensure correct order of operations.

• Ensure to handle parentheses to maintain the correct evaluation order...read more
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Round duration - 90 minutes
Round difficulty - Medium

Timing was 10AM. The platform was quite good.

Q1. 
Maximum Size Rectangle Sub-matrix with All 1's Problem Statement
You are provided with an N * M sized binary matrix 'MAT' where 'N' denotes the number of rows and 'M' denotes the number of columns. Your t...read more
Ans. 
Find the maximum area of a submatrix with all 1's in a binary matrix.
• Iterate over each cell in the matrix and calculate the maximum area of submatrix with that cell as the top-left corner.

• Use dynamic programming to keep track of the maximum width of 1's ending at each cell.

• Update the maximum area as you iterate through the matrix.

• Return the maximum area found.
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Q2. 
Binary Tree Maximum Path Sum Problem Statement
Determine the maximum path sum for any path in a given binary tree with 'N' nodes.
Note:
• A 'path' is defined as any sequence of adjacent nodes connected...read more
Ans. 
Find the maximum path sum in a binary tree with 'N' nodes.
• Traverse the binary tree to find all possible paths and calculate their sums.

• Keep track of the maximum sum encountered during traversal.

• Consider both left and right child nodes while calculating the path sum.

• Handle null nodes represented by '-1' in the input.

• Return the maximum path sum for each test case.
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Q3. 
Minimum Number of Swaps to Sort an Array
Find the minimum number of swaps required to sort a given array of distinct elements in ascending order.
Input:
T (number of test cases)
For each test case:
N (siz...read more
Ans. 
The minimum number of swaps required to sort a given array of distinct elements in ascending order.
• Use graph theory to solve the problem by counting cycles in the permutation.

• The number of swaps needed is equal to the number of cycles in the permutation minus one.

• Consider using a hashmap to keep track of visited elements to optimize the solution.

• Example: For input array [4, 3, 2, 1], the minimum number of swaps require
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Q4. 
Infix to Postfix Conversion
Convert a given infix expression, represented as a string EXP, into its equivalent postfix expression.
Explanation:
An infix expression is formatted as a op b where the opera...read more
Ans. 
Convert infix expression to postfix expression.
• Use a stack to keep track of operators and operands.

• Follow the rules of precedence for operators.

• Handle parentheses to ensure correct order of operations.
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