ShopDeck Software Developer Interview Questions and Answers

Computer Fundamentals

Q1. Flatten a binary tree
Ans. 
Flatten a binary tree by converting it into a linked list in-place.
• Use a recursive approach to flatten the binary tree.

• Traverse the tree in a pre-order manner and keep track of the previous node.

• Set the left child of each node to null and the right child to the next node in the linked list.

• Example: Input: 1 -> 2 -> 5 -> 3 -> 4 -> null, Output: 1 -> null -> 2 -> null -> 3 -> null -> 4 -> null -> 5 -> null
Answered by AI
Add your answer

Q1. Impliment counter using closure in js
Ans. 
Implement a counter using closure in JavaScript.
• Create a function that returns another function which increments a counter variable.

• The counter variable should be defined in the outer function's scope and only accessible to the inner function.

• Each time the inner function is called, increment the counter variable and return its value.
Answered by AI
Add your answer
Q2. Explain promises, promise.all(), impliment binary search
Ans. 
Promises are objects representing the eventual completion or failure of an asynchronous operation. promise.all() is a method that takes an array of promises and returns a single promise that resolves when all of the promises have resolved.
• Promises are used in JavaScript to handle asynchronous operations.

• promise.all() takes an array of promises and returns a single promise that resolves when all promises in the array ha...read more
Answered by AI
Add your answer

Q1. Questions on kafka, cache invalidation, diff b/w authentication and authorization
Add your answer

Solving normal Puzzles to test aptitude.

Sample app was asked to create.

They have their own coding platform. The questions are basically from tree.

Tree of space question

Q1. Previous round question solution
Add your answer
Q2. System design was asked.
Add your answer

Leecode medium level question

Leetcode Hard level Question

Q1. This is cto round asked some interview questions
Add your answer

Round duration - 75 minutes
Round difficulty - Medium

Test Comprises of 3 coding questions and some MCQs

Q1. MCQ Questions
CS fundamentals

Number Of MCQs - 7
Add your answer

Round duration - 60 minutes
Round difficulty - Medium

2 coding questions of (1 easy and 1 medium level) on hackerrank code-pair with the Interviewer

Q1. Mathematics Problem
Write a function that accepts a List of employee hours, a budget, and salary. The function should return true if the payment needed to go out to the employees is under budget, and false ...read more
Ans. 
Tip 1 : Clear with your basics of language in which you code.
Tip 2 : Practice enough to build logic at the time of the interview.
Tip 3 : Practice CS fundamentals and OOPS Concepts
Answered by CodingNinjas
Add your answer

Round duration - 60 minutes
Round difficulty - Easy

This Round was based on CS fundamentals and One coding question was there as a Code-pair.

Q1. Next greater Element
For a given array/list of integers of size N, print the Next Greater Element(NGE) for every element. The Next Greater Element for an element X is the first element on the right side of...read more
Ans. Brute Force
For every element in the array, we will run a loop on its right side. As soon as we find an element on its right side which is greater than it, we will break the loop, assign it as the NGE of this element, move forward, and do the same for the next element.
Space Complexity: O(1)Explanation:
O(1)
 
No extra space is used.
Time Complexity: O(n^2)Explanation:
O(N ^ 2),  Where N is the number of elements ...read more
Answered by CodingNinjas
View 2 more amswers

Kadance algorithm and find the middle of the linklist

More on java and Python based coding questions

Q1. Behavioural questions were asked
Add your answer
Q2. What are your expectations from this job
Add your answer
Q3. What are your plans ahead
Add your answer
Q4. Where do you see yourself in 5 years ahead
Add your answer