10times Software Developer Interview Questions and Answers

Round duration - 45 Minutes
Round difficulty - Medium

It was in the mid day and since I applied for a Frontend role the discussion was majorly around data structure and bit of Javascript.
The interviewer was helping and good listener.

Q1. 
Merge Two Sorted Linked Lists Problem Statement
You are provided with two sorted linked lists. Your task is to merge them into a single sorted linked list and return the head of the combined linked list.
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Ans. 
Merge two sorted linked lists into a single sorted linked list without using additional space.
• Create a dummy node to start the merged list

• Compare the values of the two linked lists and add the smaller value to the merged list

• Move the pointer of the merged list and the pointer of the smaller value list

• Continue this process until one of the lists is fully traversed

• Append the remaining elements of the other list to the me
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Q2. 
Sort 0 1 2 Problem Statement
Given an integer array arr of size 'N' containing only 0s, 1s, and 2s, write an algorithm to sort the array.
Input:
The first line contains an integer 'T' representing the n...read more
Ans. 
Sort an array of 0s, 1s, and 2s in linear time complexity.
• Use three pointers to keep track of 0s, 1s, and 2s while traversing the array.

• Swap elements based on the values encountered to sort the array in-place.

• Time complexity should be O(N) and space complexity should be O(1).
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Round duration - 60 Minutes
Round difficulty - Medium

It was more of a in depth round on the framework I'm working on and problem solving.

Q1. What is the event loop and what is its significance?
Ans. 
The event loop is a mechanism in programming that allows for asynchronous execution of code.
• The event loop is a key component in JavaScript's runtime environment, responsible for handling asynchronous operations.

• It continuously checks the call stack for any pending tasks and executes them in a non-blocking manner.

• The event loop ensures that the program remains responsive by allowing other code to run while waiting for ...read more
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Q2. Can you provide examples of output-based questions in JavaScript that utilize browser APIs?
Ans. 
Output-based questions in JavaScript using browser APIs
• Example 1: Write a script that uses the Geolocation API to display the user's current location on a map

• Example 2: Create a program that uses the Web Audio API to play a sound when a button is clicked

• Example 3: Develop a web page that uses the Canvas API to draw a simple animation
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Q3. How would you design a system to support localization in a mobile app?
Ans. 
Designing a system to support localization in a mobile app
• Use resource files to store localized strings for different languages

• Implement a language selection feature for users to choose their preferred language

• Utilize localization libraries or frameworks to streamline the process

• Consider cultural differences when localizing content, such as date formats and currency symbols
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Round duration - 75 Minutes
Round difficulty - Hard

It was more of a fitment/managerial round.
Didn't had any coding questions, but was asked more on approaches and optimisations.
Discussions on the project you have worked on.

Q1. You need to find the fastest 3 horses out of a group, given that you can only race 5 horses at a time. How would you approach this problem?
Ans. 
To find the fastest 3 horses out of a group with 5 horses racing at a time, we can use a tournament style approach.
• Divide the horses into groups of 5 and race them against each other. This will give you the fastest horse in each group.

• Take the winners from each group and race them against each other. The top 3 horses in this final race will be the fastest 3 overall.

• Keep track of the results and compare the timings to d
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Q2. How do you debug the root cause of lag on a screen?
Ans. 
To debug lag on a screen, analyze code, check for memory leaks, optimize rendering, and use profiling tools.
• Analyze code to identify any inefficient algorithms or operations causing lag.

• Check for memory leaks that could be impacting performance.

• Optimize rendering by reducing the number of draw calls, optimizing shaders, and minimizing overdraw.

• Use profiling tools like Xcode Instruments or Android Profiler to identify p
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Q3. Can you explain the architecture of the app you have recently worked on?
Ans. 
The app I recently worked on is a social media platform for sharing photos and connecting with friends.
• The app follows a client-server architecture, with the client being the mobile app and the server handling data storage and processing.

• The client side is built using React Native for cross-platform compatibility.

• The server side is implemented using Node.js with a MongoDB database for storing user data and photos.

• The a...read more
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Techstack knowledge of Scala, Kafka etc

Q1. Java oops concepts and garbage collector
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Q2. Buy and sell stocks 2 of leetcode
Ans. 
Design an algorithm to buy and sell stocks to maximize profit
• Use a greedy approach to find the maximum profit by buying at the lowest price and selling at the highest price

• Keep track of the minimum price seen so far and update the maximum profit if a higher price is found

• Return the maximum profit that can be achieved
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Round duration - 150 Minutes
Round difficulty - Medium

3 coding questions and 20 mcq's

Q1. 
Maximum Sum of Two Non-Overlapping Subarrays
Given an integer array ARR and a positive integer K, your task is to determine two non-overlapping subarrays of length K that yield the maximum combined sum.
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Ans. 
The task is to find two non-overlapping subarrays of length K in an array, such that their sum is maximum.
• Iterate through the array and calculate the sum of each subarray of length K

• Store the maximum sum obtained from the first subarray

• Iterate again and calculate the sum of each subarray of length K, excluding the previous subarray

• Store the maximum sum obtained from the second subarray

• Return the sum of the two maximum
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Q2. 
Distinct Subsequences Problem Statement
You are given a string 'S' of length 'N' which may include duplicate alphabets. Your goal is to calculate the number of distinct subsequences in the string.
Exampl...read more
Ans. 
The task is to find the count of distinct subsequences in a given string.
• Use dynamic programming to solve the problem.

• Create a 2D array to store the count of distinct subsequences for each prefix of the string.

• Initialize the first row of the array with 1, as there is only one subsequence of an empty string.

• For each character in the string, calculate the count of distinct subsequences by considering two cases: including...read more
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Q3. 
Array Intersection Problem Statement
Given two integer arrays/ lists ARR1 and ARR2 of sizes N and M respectively, you are required to determine their intersection. An intersection is defined as the set of...read more
Ans. 
The task is to find the intersection of two integer arrays/lists.
• Read the number of test cases

• For each test case, read the size and elements of the first array/list

• Read the size and elements of the second array/list

• Find the intersection of the two arrays/lists

• Print the intersection elements in the order they appear in the first array/list
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Round duration - 120 Minutes
Round difficulty - Medium

Online video call based round, Timing was 10-11 AM
Interview started with basic greetings, post that i explained by projects in brief and then we jumped right into dsa questoins.

Q1. 
Number of Islands Problem Statement
You are given a non-empty grid that consists of only 0s and 1s. Your task is to determine the number of islands in this grid.
An island is defined as a group of 1s (re...read more
Ans. 
The task is to find the number of islands in a grid consisting of 0s and 1s.
• An island is a group of 1s connected horizontally, vertically, or diagonally

• The grid is surrounded by 0s on all four edges

• Use a depth-first search (DFS) or breadth-first search (BFS) algorithm to traverse the grid and count the number of islands

• Initialize a visited array to keep track of visited cells

• For each unvisited cell with a value of 1, p...read more
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Q2. 
Arrangement Problem Statement
Determine the number of permutations of list A = [1, 2, ..., N] such that for every index i, either A[i] is divisible by i or i is divisible by A[i].
Input:
The input start...read more
Ans. 
The goal is to find the number of permutations of a list satisfying certain conditions.
• Iterate through all permutations of the list

• Check if each permutation satisfies the given conditions

• Count the number of permutations that satisfy the conditions

• Return the count for each test case
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Q3. 
Idempotent Matrix Verification
Determine if a given N * N matrix is an idempotent matrix. A matrix is considered idempotent if it satisfies the following condition:
M * M = M
Input:
The first line cont...read more
Ans. 
An idempotent matrix is a square matrix that remains unchanged when multiplied by itself.
• Check if the given matrix satisfies the property M*M = M

• Iterate through each element of the matrix and perform the matrix multiplication

• Compare the result with the original matrix

• If they are equal, return true; otherwise, return false
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Round duration - 120 Minutes
Round difficulty - Easy

This was EM round, started with me explaining my projects in deep and facing some counter questions on that, proceeded to os, dbms basic questions and some low level designing and lastly a puzzle to end interview.

Q1. Can you design an attendance management system?
Ans. 
Design attendance management system
• Create a database to store employee information

• Implement a user interface for employees to mark their attendance

• Develop a system to track and record attendance data

• Generate reports and analytics based on attendance data
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Round duration - 20 Minutes
Round difficulty - Easy

This was formality round, HR came and explained what meesho does and told my joining dates and compensation details.

Q1. Implement an immutable class.
Ans. 
An immutable class is a class whose instances cannot be modified after creation.
• Use final keyword for class declaration to prevent inheritance

• Make all fields private and final to prevent modification

• Do not provide setter methods, only getter methods should be used
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Q2. Implement a springboot service that intercepts http requests.
Ans. 
Implement a Springboot service to intercept HTTP requests.
• Create a Springboot application with necessary dependencies.

• Implement a custom interceptor by extending HandlerInterceptorAdapter.

• Override preHandle and postHandle methods to intercept requests and responses.

• Register the interceptor in the WebMvcConfigurerAdapter configuration class.
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3 coding questions on hackerrank medium to hard

Q1. Doctor low level system design question
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3 Medium level dsa questions

Q1. Lld of cab booking system
Ans. 
The Low Level Design (LLD) of a cab booking system involves detailing the system architecture and components at a lower level of abstraction.
• Identify the main components of the system such as user interface, booking engine, payment gateway, and driver allocation algorithm.

• Define the interactions between these components and how data flows between them.

• Specify the data structures and algorithms used for efficient bookin...read more
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Q2. Discussion about online assesment
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2 medium - question 1 array and 1 dp
1 med to hard - dynamic programming

Q1. System design LLD - Polling System
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Q2. How to implement Concurrency in it.
Ans. 
Concurrency in software development allows multiple tasks to run simultaneously, improving performance and responsiveness.
• Use multithreading to execute multiple tasks concurrently

• Implement asynchronous programming to handle tasks that may take longer to complete

• Use synchronization techniques like locks and semaphores to manage access to shared resources

• Consider using thread pools to manage and reuse threads efficiently
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