NSE.IT Software Developer Interview Questions and Answers

DSA questions and programming concepts

Q1. Reverse string and optimize it
Ans. 
Reverse array of strings efficiently
• Use two pointers approach to swap characters from start and end of each string

• Optimize by using in-place reversal instead of creating new strings

• Consider edge cases like empty strings or strings with only one character
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Q2. Reverse binary tree
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Q1. Salary expectations
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Q2. Joining location
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Q1. What is Concrete class ?
Ans. 
A concrete class is a class that can be instantiated, meaning it can be used to create objects.
• Cannot be abstract

• Can be instantiated

• Can have concrete methods and properties

• Example: class Car {}
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Used Mettl platform for test