Classplus React Js Frontend Developer Interview Questions and Answers

Q1. Question around priority queue
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Q2. Decode strings leetcode
Ans. 
Decode strings involves interpreting encoded patterns like '3[a2[c]]' to produce 'accaccacc'.
• Use a stack to handle nested structures. Example: For '2[abc]', push '2' and 'abc' onto the stack.

• Iterate through the string, building numbers and characters. Example: '3[a2[c]]' becomes '3', 'a', '2', 'c'.

• When encountering ']', pop from the stack until '[' is found, then repeat the string as per the number. Example: '2[c]' bec...read more
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Q1. System design questions scenario based
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Q1. Questions on multidimensional tree
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Simple and easy ..basic fundamentals of language

Basic of aptitude .. vocabulary, general knowledge

Normal concepts of apps only please be prepare on math,time,distance and other topics as well

They will check your problem solving ability in coding

Online technical aptitude test

Q1. Related oops and old company projects
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Q1. What’s functional interface and uses. Server side and client side load balancing.
Ans. 
Functional interface is an interface with only one abstract method. Load balancing is used to distribute workload.
• Functional interface is used in lambda expressions in Java.

• Load balancing is used to distribute workload across multiple servers.

• Server side load balancing is done by a load balancer that sits between the client and server.

• Client side load balancing is done by the client application itself.

• Load balancing im...read more
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Q1. Transactional levels and propagation labels cases. Find the sequence of Substring duplicates counts.
Ans. 
The question is unclear and seems unrelated to software development.
• Ask for clarification on the question.

• Transactional levels and propagation labels are related to database transactions.

• Substring duplicates counts can be solved using string manipulation.

• It is unclear how these two topics are related.
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Basics of aptitude questions like relation,train,boat, probability,number series , and so on...

String occurrence, array list

Q1. Man crossing a bridge
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Q2. Wrong label on the boxes
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The wrong label on the boxes can cause confusion and errors in the software development process.
• Ensure proper labeling of boxes to avoid confusion

• Double check labels before using them in the development process

• Communicate with team members to clarify any discrepancies in labeling
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Medium to hard questions based on arrays, dp

Q1. Quick sort algorithm
Ans. 
Quick sort is a popular sorting algorithm that uses divide and conquer strategy.
• Divides array into smaller sub-arrays based on a pivot element

• Recursively sorts sub-arrays

• Combines sorted sub-arrays to get final sorted array

• Time complexity: O(n log n) on average, O(n^2) worst case

• Example: [3, 6, 8, 10, 1, 2, 1] -> [1, 1, 2, 3, 6, 8, 10]
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Q2. Modified rotate a matrix
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Rotate a matrix by 90 degrees in place
• Transpose the matrix

• Reverse each row of the transposed matrix
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