Droom Software Engineer Intern Trainee Interview Questions and Answers

About artificial intelligence

What is oops and print fobanocci series

Q1. BookMyShow low level design
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Q2. Heap data structures question
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Q1. Center div using 3 approaches
Ans. 
Three approaches to center a div element
• Using CSS flexbox: set display property of parent element to flex and justify-content to center

• Using CSS grid: set display property of parent element to grid and place the div in the center grid area

• Using margin: set margin property of the div to auto
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Q2. Display use of setTimeout
Ans. 
setTimeout is a function in JavaScript used to execute a function after a specified amount of time.
• setTimeout(function, milliseconds) is used to delay the execution of a function by a specified number of milliseconds.

• Example: setTimeout(() => { console.log('Hello, world!'); }, 2000) will log 'Hello, world!' after 2 seconds.
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Asked me to create a carousel component

Questions from trees and linkedin

Q1. Question on dsa and on oops
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Q2. Reverse linked list with multiple approach
Ans. 
Reverse a linked list using multiple approaches.
• Iterative approach: Use three pointers to reverse the links between nodes.

• Recursive approach: Recursively reverse the rest of the list and adjust the links.

• Stack approach: Push all the nodes onto a stack and then pop them to create the reversed list.
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The test consisted of 4 DSA questions (1 easy, 2 medium, 1 hard) that had to be completed in 2 hours. They were standard questions from Leetcode and the test was similar to Leetcode's weekly coding contest.

Q1. Simple DSA questions like time complexity to insert in a Hash Map, the difference between singly and doubly linked lists, etc.
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Q2. Subarray with sum 0
Ans. 
Find subarray in an array with sum 0
• Iterate through the array and keep track of the running sum

• Store the running sum in a hashmap and check if the same sum has been seen before

• If the sum is 0 or if the running sum is already in the hashmap, a subarray with sum 0 exists
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Q3. Linked List Cycle
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Q4. Rainwater trapping proble
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Q1. Design a database for a blogging website
Ans. 
Database design for a blogging website
• Create tables for users, blog posts, comments, and categories

• Use primary and foreign keys to establish relationships between tables

• Include fields such as title, content, author, date, and tags

• Implement indexing for faster retrieval of data

• Consider implementing a caching mechanism for improved performance
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Q2. What can be done to balance the load of requests coming to a single server
Ans. 
To balance the load of requests on a single server, one can implement load balancing techniques.
• Implementing a load balancer to distribute incoming requests evenly across multiple servers

• Using round-robin algorithm to route requests to different servers in a sequential manner

• Utilizing server health checks to monitor the performance of each server and adjust the load distribution accordingly
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Q1. Design database for my college
Ans. 
Design a database for a college
• Create tables for students, courses, professors, departments, and grades

• Establish relationships between tables using foreign keys

• Include attributes such as student ID, course ID, professor ID, department ID, and grade

• Consider normalization to reduce redundancy and improve data integrity
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Q2. Pseudo code to validate password
Ans. 
Pseudo code to validate password
• Create a function that takes a password as input

• Check if the password meets the required criteria (e.g. length, special characters)

• Return true if the password is valid, false otherwise
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Q3. Strengths and weakness that can affect my profesional life
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Q4. Challenges faced during the projects in my resum and how did I overcome them
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5 questions of medium difficulty level covering topics like queue, dynamic programming, binary search, greedy.

Q1. System design. Using a NoSQL document schema. Design a document store schema to store bike model data.
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Q1. Willing to relocate to Navi Mumbai. Strengths and weekness General process related to my compatibility with the company.
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Easy to medium, can solve with leetcode medium

Q1. Number of islands count
Ans. 
Count the number of islands in a grid of '1's and '0's
• Iterate through the grid and for each '1' encountered, perform a depth-first search to mark all connected '1's as visited

• Increment the island count for each new island found

• Ensure to handle boundary cases and check for visited nodes
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Q2. First and last index of a particular element in an array
Ans. 
Find the first and last index of a specific element in an array of strings.
• Iterate through the array and keep track of the index of the first and last occurrence of the element.

• Return the first and last index once the iteration is complete.

• Example: Array ['apple', 'banana', 'apple', 'orange'], element 'apple' - First index: 0, Last index: 2.
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