CognitivZen Technologies Senior Software Developer Interview Questions and Answers

Q1. How make a queue using a stack
Ans. 
To implement a queue using a stack, use two stacks and simulate the queue operations.
• Use two stacks, one for enqueue operation and one for dequeue operation.

• For enqueue operation, simply push elements onto the stack used for enqueueing.

• For dequeue operation, if the dequeue stack is empty, pop all elements from enqueue stack and push onto dequeue stack.

• Then pop from the dequeue stack to simulate dequeue operation.
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Q2. Create a linked list
Ans. 
A linked list is a data structure consisting of nodes where each node points to the next node in the sequence.
• Create a Node class with data and next pointer

• Initialize a head pointer to null

• Add nodes by updating next pointers

• Traverse the list by following next pointers
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Coding Rount
DSA Round + Puzzle
SQL + Project Discussion
JS

Dsa problems dp and tress problem

Q1. Tell me about your self
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Q2. Projects and intership
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Q1. Core concepts on for the language you are giving interview
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Q2. Detailed questions from resume
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Q1. Basic to medium complexity coding question
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Q2. Check culture fit
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Q1. General questions like about family, native place & salary discussion
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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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Aptitude test was easy but difficult

Q1. Technical questions linked list
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Q2. Array binary search Dp
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String , array,recursion.pattern question

Q1. Array string recursion
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Q2. Sort the o 1 2 0
Ans. 
The numbers should be sorted in ascending order: 0 1 2
• Use a sorting algorithm like bubble sort, selection sort, or insertion sort

• Compare each number with the next one and swap if necessary

• Repeat the process until the array is sorted
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Q3. Pattern question
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Genral aptitude questions

Q1. Be prepared with your basics
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Q2. Languages and work flow
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Q3. Be aware what you keep in your resume
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Q4. Be strong in a area
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