ReachAll Techlabs Private Limited Interview Questions and Answers

Q1. What data structure is used to implement a priority queue?
Ans. 
Binary heap is used to implement a priority queue.
• Binary heap is a complete binary tree where each node has a value greater than or equal to its children.

• It can be implemented using arrays, where the parent of node at index i is at index (i-1)/2.

• Insertion and deletion operations have time complexity of O(log n) in a binary heap.
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Q2. How many trees will a binary tree have?
Ans. 
A binary tree can have any number of nodes, but the maximum number of trees with n nodes is 2^n.
• A binary tree can have 0 nodes, 1 node, 2 nodes, or any number of nodes.

• The maximum number of binary trees with n nodes is 2^n.

• For example, a binary tree with 3 nodes can have up to 8 different structures.
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Q1. SQL Query to return the second highest marks in a student database
Ans. 
Use a SQL query to find the second highest marks in a student database.
• Use the ORDER BY clause to sort the marks in descending order

• Use the LIMIT clause to limit the result to the second row
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Q2. Program to check if two strings are anagrams
Ans. 
Program to check if two strings are anagrams
• Create a function that takes in two strings as input

• Remove any spaces and convert both strings to lowercase for consistency

• Sort the characters in both strings and compare if they are equal to determine if they are anagrams

• Example: 'listen' and 'silent' are anagrams
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Q1. How Performance of application can be improved
Ans. 
Performance of an application can be improved by optimizing code, using efficient algorithms, caching data, and scaling resources.
• Optimize code by reducing unnecessary loops, improving database queries, and minimizing memory usage

• Use efficient algorithms like binary search instead of linear search for large datasets

• Implement caching mechanisms to store frequently accessed data and reduce database calls

• Scale resources b...read more
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Q1. SQL Questions - Constraints- how to optimize long SQL query without changing the output
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Q1. Introduce Yourself
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Q2. What is current designation
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Q1. What is your design process.
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Q2. How do you work with developer push-back?
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Q3. How do you overcome personal bias in user research?
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Make a autobiography app

Q1. Share your working experience
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Q2. Why are you leaving current firm?
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Q3. How do you percieve the design systems
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Q1. What you know about serialization
Ans. 
Serialization is the process of converting an object into a format that can be easily stored or transmitted.
• Serialization is used in programming to save the state of an object so that it can be recreated later.

• It is commonly used in data storage, network communication, and in the implementation of remote procedure calls.

• Examples of serialization formats include JSON, XML, and Protocol Buffers.
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Q2. Where you see yourself in next 5 years
Ans. 
In the next 5 years, I see myself advancing in my career, taking on more responsibilities, and potentially leading a team.
• Continuing to develop my skills and expertise in my field

• Seeking opportunities for growth and advancement within the company

• Possibly pursuing further education or certifications to enhance my knowledge

• Taking on leadership roles and mentoring junior team members

• Working towards achieving specific care
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C,c++ questions and two coding questions. basic mcq

Q1. Treeset, hashset difference
Ans. 
TreeSet and HashSet are both implementations of the Set interface in Java, but they have some key differences.
• TreeSet is a sorted set that maintains elements in ascending order, while HashSet does not guarantee any specific order.

• TreeSet uses a Red-Black tree data structure for storage, which allows for efficient retrieval of elements in sorted order.

• HashSet uses a hash table for storage, which provides constant-time p...read more
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Q2. Oops concept, dbms, programming questions
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Q3. Set and treeset and hashset
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2 questions, Easy and medium based

Q1. Stacks queues and array questions
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Q1. Technical questions on projects
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Q1. How to tackle any uncertain situations? Behavioural questions
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Q1. Based on resume
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Q1. Based on resume
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Q1. Basic information
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Q1. Based on resume
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Scenario questions logical solving

Need to explain about problems solved in previous round

Q1. Project discussion and basics information
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