Classplus Software Developer Interview Questions and Answers

Basic DSA questions, best time to buy and sell stock and its variation

Q1. Basic nosql vs sql questions
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Q2. Designing system for google playstore
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Q1. Questions were completely based on data structures and algorithm
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Q2. SQL based questions were also asked
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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
Ans. 
Rotate a matrix by 90 degrees in place
• Transpose the matrix

• Reverse each row of the transposed matrix
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Q1. To print all permutation of a string
Ans. 
Use recursion to generate all possible permutations of a given string.
• Use recursion to swap characters in the string to generate permutations

• Keep track of visited characters to avoid duplicates

• Base case: when the length of the string is 1, add it to the result array
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Q1. Coin change Problem of finding number of ways to achieve K value
Ans. 
The coin change problem involves finding the number of ways to make a certain value using a given set of coins.
• Use dynamic programming to solve the coin change problem efficiently.

• Create a 1D array to store the number of ways to make each value from 0 to the target value.

• Iterate through the coins and update the array based on the current coin's value.

• The final answer will be stored in the last element of the array.

• Exam...read more
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Q1. Suduko solver question is given to me
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2 Query question and 3 coding questions

Q1. Basic oops , Java script and Networking questions.
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Q2. What is object orienteered programming.
Ans. 
Object oriented programming is a programming paradigm based on the concept of objects, which can contain data and code.
• Objects are instances of classes, which define the structure and behavior of the objects.

• Encapsulation, inheritance, and polymorphism are key principles of object oriented programming.

• Example: Java, C++, Python are popular languages that support object oriented programming.
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Q3. Different Events in java script
Ans. 
Events in JavaScript are actions or occurrences that happen in the browser that the code can respond to.
• Events can be triggered by user actions (like clicking a button), browser actions (like page load), or system events (like a timer expiring)

• Event listeners are used to listen for and respond to events

• Common events include click, mouseover, keydown, submit, etc.
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Q4. Event listeners
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Project , coding question, DBMS

Q1. Basic personal details
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2 DSA questions Both are from DP

Q1. 2 Questions , 1 is DSA
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Q2. Second question is Puzzle
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There were 5 question out of which 2 were coding Data Structure problems , 1 was SQL based , 1 was AI based Problem ( Machine Learning ) and 1 was to create UML Diagram.
First Coding question was pretty easy , other one was kinda tough , UML Diagram was also easy and SQL query was of moderate level.

1 hr and it is pretty easy and having snippets technical questions etc

I didn't selected for second round