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Tata 1mg Software Developer Interview Questions and Answers
13 Interview questions
A Red-Black Tree is a balanced binary search tree with specific properties to ensure efficient operations.
Each node is colored either red or black.
The root node is always black.
Red nodes cannot have red children (no two reds in a row).
Every path from a node to its descendant leaves must have the same number of black nodes.
This structure ensures O(log n) time complexity for insertion, deletion, and search operation...
Use CSS to align two images with same width and height on a page
Set both images to have the same width and height using CSS
Use flexbox or grid layout to align the images horizontally or vertically
Adjust margins or padding to fine-tune the alignment
Next Greater Element Problem Statement
You are provided with an array or list ARR containing N positive integers. Your task is to determine the Next Greater Element (NGE) for each element in the array.
Th...
The task is to find the next greater element for each element in an array.
Iterate through the array from right to left
Use a stack to keep track of the elements
For each element, pop elements from the stack until a greater element is found or the stack is empty
If a greater element is found, it is the next greater element for the current element
If the stack becomes empty, there is no greater element to the right
Store...
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.
...
The task is to merge two sorted linked lists into a single sorted linked list.
Create a new linked list to store the merged list
Compare the values of the nodes from both lists and add the smaller value to the new list
Move the pointer of the list with the smaller value to the next node
Repeat the comparison and addition until one of the lists is empty
Add the remaining nodes from the non-empty list to the new list
Retu...
Rotational Equivalence of Strings Problem Statement
Given two strings 'P' and 'Q' of equal length, determine if string 'P' can be transformed into string 'Q' by cyclically rotating it to the right any numb...
The task is to check if one string can be converted into another string by cyclically rotating it to the right any number of times.
Iterate through each character of the first string and check if it matches the corresponding character in the second string after a certain number of cyclic rotations.
If all characters match for any number of cyclic rotations, then the first string can be converted into the second stri...
Longest Palindromic Subsequence Problem Statement
Given a string A consisting of lowercase English letters, determine the length of the longest palindromic subsequence within A.
Explanation:
- A subseque...
The task is to find the length of the longest palindromic subsequence in a given string.
A subsequence is a sequence generated from a string after deleting some or no characters of the string without changing the order of the remaining string characters.
A string is said to be palindrome if the reverse of the string is the same as the actual string.
Find the longest palindromic subsequence by considering all possible...
LRU Cache Implementation
Design and implement a data structure for the Least Recently Used (LRU) cache, which supports the following operations:
1. get(key) - Return the value associated with the key if i...Implement a Least Recently Used (LRU) cache data structure with get and put operations.
Use a combination of a hashmap and a doubly linked list to efficiently implement the LRU cache.
Keep track of the least recently used item and remove it when the cache reaches its capacity.
Update the position of an item in the cache whenever it is accessed or updated.
Ensure constant time complexity for both get and put operations...
Biggest Number Formation Problem
Your task is to construct the largest number possible by concatenating each of the provided positive integers in the array exactly once.
Input:
Integer T denoting the num...Construct the largest number by concatenating positive integers in the array exactly once.
Sort the array of integers in a way that the concatenation of the numbers forms the largest possible number.
Use a custom comparator function to sort the numbers based on their concatenated values.
Join the sorted array elements to form the final largest number.
Number of Longest Increasing Subsequence Problem Statement
Given an integer array ARR of length N, determine the count of longest increasing subsequences present in the array.
Explanation:
The Longest In...
Count the number of longest increasing subsequences in an integer array.
Identify the longest increasing subsequences in the array
Count the number of such subsequences
Consider the constraints while implementing the solution
Examples: For input [50, 3, 90, 60, 80], the output is 2
Possible Words from a Phone Number: Problem Statement
Given a string S composed of digits ranging from 2 to 9, determine all possible strings that can be created by mapping these digits to their correspond...
Given a phone number, generate all possible words by mapping digits to letters on a T9 keypad.
Create a mapping of digits to letters on a T9 keypad
Use recursion to generate all possible combinations of letters for the given phone number
Sort the resulting strings in lexicographical order
Tata 1mg Software Developer Interview Experiences
6 interviews found
Chirag Varshney
(4 Questions)
- Q1. Explain Deadlock?
- Ans.
Deadlock is a situation in computing where two or more processes cannot proceed because each is waiting for the other to release resources.
Occurs in multi-threaded environments when processes hold resources and wait for others.
Example: Process A holds Resource 1 and waits for Resource 2, while Process B holds Resource 2 and waits for Resource 1.
Can lead to system inefficiency and unresponsiveness.
Deadlock detection and...
- Q2. Explain Red Black Tree?
- Ans.
A Red-Black Tree is a balanced binary search tree with specific properties to ensure efficient operations.
Each node is colored either red or black.
The root node is always black.
Red nodes cannot have red children (no two reds in a row).
Every path from a node to its descendant leaves must have the same number of black nodes.
This structure ensures O(log n) time complexity for insertion, deletion, and search operations.
Exa...
- Q3. Find local minima in a 1-D array?
- Q4. Find local minima in 2-D array?
- Ans.
Local minima in a 2-D array are elements smaller than their neighbors. We can find them using various algorithms.
A local minimum is defined as an element that is less than its adjacent elements.
For example, in the array [[9, 8, 7], [6, 5, 4], [3, 2, 1]], the element 1 is a local minimum.
To find local minima, iterate through each element and compare it with its neighbors (up, down, left, right).
Consider edge cases where...
Skills evaluated in this interview
Anonymous
Majorily on SQL and Databases
(2 Questions)
- Q1. Align two images in a page with same width and same height
- Ans.
Use CSS to align two images with same width and height on a page
Set both images to have the same width and height using CSS
Use flexbox or grid layout to align the images horizontally or vertically
Adjust margins or padding to fine-tune the alignment
- Q2. Array related question
(2 Questions)
- Q1. Situation based question
- Q2. Majorily focused on project
Skills evaluated in this interview
Abhishek Chauhan
I applied via Campus Placement and was interviewed in Apr 2023. There were 3 interview rounds.
2 coding question one on maximum sum problem and other on tree traversal
(1 Question)
- Q1. Dbms oops dsa questions are there and one coding question which you have to pseudo code it and dry run it
I appeared for an interview in Dec 2021.
(1 Question)
Round duration - 90 minutes
Round difficulty - Medium
There were a total of 3 coding questions to be solved, and the time limit was 90 minutes. The candidate was free to use language of their choice.
- Q1.
Longest Palindromic Subsequence Problem Statement
Given a string
Aconsisting of lowercase English letters, determine the length of the longest palindromic subsequence withinA.Explanation:
- A subsequ...
- Ans.
The task is to find the length of the longest palindromic subsequence in a given string.
A subsequence is a sequence generated from a string after deleting some or no characters of the string without changing the order of the remaining string characters.
A string is said to be palindrome if the reverse of the string is the same as the actual string.
Find the longest palindromic subsequence by considering all possible subs...
(2 Questions)
Round duration - 45 minutes
Round difficulty - Easy
The first round of interview lasted for around 45 minutes. I was asked two DSA questions, and was supposed to code them while my screen was shared. I wrote code for both the questions with little help from the interviewer. Finally, I was asked couple of questions based on my resume.
- 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.
... - Ans.
The task is to merge two sorted linked lists into a single sorted linked list.
Create a new linked list to store the merged list
Compare the values of the nodes from both lists and add the smaller value to the new list
Move the pointer of the list with the smaller value to the next node
Repeat the comparison and addition until one of the lists is empty
Add the remaining nodes from the non-empty list to the new list
Return th...
- Q2.
Rotational Equivalence of Strings Problem Statement
Given two strings 'P' and 'Q' of equal length, determine if string 'P' can be transformed into string 'Q' by cyclically rotating it to the right any num...
- Ans.
The task is to check if one string can be converted into another string by cyclically rotating it to the right any number of times.
Iterate through each character of the first string and check if it matches the corresponding character in the second string after a certain number of cyclic rotations.
If all characters match for any number of cyclic rotations, then the first string can be converted into the second string.
Us...
(1 Question)
Round duration - 30 minutes
Round difficulty - Medium
I was given one data structure question and was then asked about recursion.
- Q1.
Next Greater Element Problem Statement
You are provided with an array or list
ARRcontainingNpositive integers. Your task is to determine the Next Greater Element (NGE) for each element in the array.T...
- Ans.
The task is to find the next greater element for each element in an array.
Iterate through the array from right to left
Use a stack to keep track of the elements
For each element, pop elements from the stack until a greater element is found or the stack is empty
If a greater element is found, it is the next greater element for the current element
If the stack becomes empty, there is no greater element to the right
Store the ...
(1 Question)
Round duration - 40 minutes
Round difficulty - Easy
This was the hiring manager round. No data structures question were asked in this round. There was discussion around the projects that I had done and my resume. As I am from EEE branch, I was asked why I want to get into software. The interview happened around 8 PM. I was asked to create a schema for one of my projects.
- Q1. Why do you want to pursue a career in software?
- Ans.
I want to get into software because of my passion for problem-solving and the opportunity to create innovative solutions.
Passion for problem-solving
Opportunity to create innovative solutions
Interest in technology and its impact on society
Career growth and job stability
Flexibility and remote work options
Interview Preparation Tips
Tip 1 : Practice regularly, meaning once you have covered all the topics, revisit them every week, and solve 3-5 questions.
Tip 2 : Use the Feynman technique. Explain your approach towards solving the problem to someone, or better yet, note it down so that when you revisit that question, the explanation is handy.
Tip 3 : Do 1 project, preferably a full-stack one including a database. This would provide some material for discussion, and be through with each aspect of the project.
Tip 1 : Keep the resume to one page and put info that is directly related to the role applied.
Tip 2 : In the projects section, keep a maximum of 3 projects, but ensure that at least one of them is hosted/live that can be shown to the interviewer.
Skills evaluated in this interview
I appeared for an interview in Dec 2021.
(2 Questions)
Round duration - 60 Minutes
Round difficulty - Medium
It has 3 Coding Questions of medium-hard level and the time limit was 1 hour only. I don’t exactly remember the questions but I was able to do only two of them completely.
- Q1.
Biggest Number Formation Problem
Your task is to construct the largest number possible by concatenating each of the provided positive integers in the array exactly once.
Input:
Integer T denoting the nu... - Ans.
Construct the largest number by concatenating positive integers in the array exactly once.
Sort the array of integers in a way that the concatenation of the numbers forms the largest possible number.
Use a custom comparator function to sort the numbers based on their concatenated values.
Join the sorted array elements to form the final largest number.
- Q2.
Number of Longest Increasing Subsequence Problem Statement
Given an integer array
ARRof lengthN, determine the count of longest increasing subsequences present in the array.Explanation:
The Longest I...
- Ans.
Count the number of longest increasing subsequences in an integer array.
Identify the longest increasing subsequences in the array
Count the number of such subsequences
Consider the constraints while implementing the solution
Examples: For input [50, 3, 90, 60, 80], the output is 2
(3 Questions)
Round duration - 60 Minutes
Round difficulty - Medium
First, the interviewer introduced himself and then asked to introduce myself. Then he asked about the projects I did. After an introductory discussion on projects, he gave me 3 coding questions on their personal live code environment.
He asked me to explain the approach first and then code it down. I had to explain the time complexity of each solution and optimal code if possible with lesser time complexity.
- Q1.
Cache Operations Problem
You are provided with a cache that can hold a maximum of 'N' elements. Initially, this cache is empty. There are two main operations you can perform on this cache:
Explanation:
-
...
- Ans.
Implement a cache with insert, update, and retrieve operations, returning results of retrieve operations in order.
Create a cache data structure with specified size 'N'.
Implement insert and update operations based on the given criteria.
For retrieve operation, return the value associated with the 'U_ID' if present, else return -1.
Handle cases where the cache is full and least frequently used items need to be removed.
Retu...
- Q2.
Possible Words from a Phone Number: Problem Statement
Given a string
Scomposed of digits ranging from 2 to 9, determine all possible strings that can be created by mapping these digits to their correspon... - Ans.
Given a phone number, generate all possible words by mapping digits to letters on a T9 keypad.
Create a mapping of digits to letters on a T9 keypad
Use recursion to generate all possible combinations of letters for the given phone number
Sort the resulting strings in lexicographical order
- Q3.
Shortest Unique Prefix Problem
You are given an array containing
Nwords. Your task is to derive the shortest prefix for each word that uniquely identifies it amongst the other words. For instance, given t... - Ans.
Given an array of words, find the shortest unique prefix for each word.
Create a Trie data structure to efficiently store and search for prefixes.
Traverse the Trie to find the shortest unique prefix for each word.
Return the list of shortest unique prefixes for all words.
(2 Questions)
Round duration - 60 Minutes
Round difficulty - Hard
In this round interviewer gave me 2 coding questions and asked me to code on any editor of my choice. I opened VS code to code those problems.
- Q1.
Maximum Subarray Sum Problem Statement
Given an array
arrof lengthNconsisting of integers, find the sum of the subarray (including empty subarray) with the maximum sum among all subarrays.Explanation...
- Ans.
Find the sum of the subarray with the maximum sum among all subarrays in a given array.
Iterate through the array and keep track of the maximum sum subarray seen so far.
Use Kadane's algorithm to efficiently find the maximum subarray sum.
Handle cases where all elements are negative by returning the maximum element in the array.
Consider the sum of an empty subarray as 0.
- Q2.
LRU Cache Implementation
Design and implement a data structure for the Least Recently Used (LRU) cache, which supports the following operations:
1. get(key) - Return the value associated with the key if ... - Ans.
Implement a Least Recently Used (LRU) cache data structure with get and put operations.
Use a combination of a hashmap and a doubly linked list to efficiently implement the LRU cache.
Keep track of the least recently used item and remove it when the cache reaches its capacity.
Update the position of an item in the cache whenever it is accessed or updated.
Ensure constant time complexity for both get and put operations by u...
Round duration - 40 Minutes
Round difficulty - Easy
The interviewer was very friendly. He asked me about myself and previous interviews.
Interview Preparation Tips
Tip 1 : Do at least 2-3 Development Projects as it creates a great impression.
Tip 2 : Do it simply don't include complex terms to explain anything/concept.
Tip 3 : Practice as many questions as you can.
Tip 1 : Resume should be one page only as being a fresher impacts a lot.
Tip 2 : Resumes should contain all the links for projects and certificates as it impresses the interviewer.
Skills evaluated in this interview
Selected
I applied via Referral and was interviewed before Sep 2022. There were 3 interview rounds.
(1 Question)
- Q1. React JS, coding round, DSA, poly phill, map , shallow copy deep copy, popular JS DSA questions
Basic React JS clock/ stopwatch
Interview Preparation Tips
What people are saying about Tata 1mg
Interview questions from similar companies
I appeared for an interview before Apr 2021.
(2 Questions)
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.
... - 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...
- Q2.
Sort 0 1 2 Problem Statement
Given an integer array
arrof 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... - 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).
(3 Questions)
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 ...
- 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
- 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
(3 Questions)
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...
- 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...
- 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...
Interview Preparation Tips
Tip 1 : Get your JS fundamentals right (if applying for a Frontend role, https://javascript.info/ is a good start)
Tip 2 : Apart from preparing data structures, practise on the communication skills as well (prepare your introduction, be a good listener and on spot improvisation plays key roles)
Tip 1 : highlight projects related to the job profile in your resume and mention what was your contribution in them precisely in 1/2 lines.
Tip 2 : Include URLs to applications/projects that you have build and your achievements/blog (if any)
Skills evaluated in this interview
I appeared for an interview before Sep 2020.
(2 Questions)
Round duration - 60 Minutes
Round difficulty - Easy
- Q1.
0/1 Knapsack Problem Statement
A thief is planning to rob a store and can carry a maximum weight of 'W' in his knapsack. The store contains 'N' items where the ith item has a weight of 'wi' and a value of...
- Ans.
Yes, the 0/1 Knapsack problem can be solved using dynamic programming with a space complexity of not more than O(W).
Use a 1D array to store the maximum value that can be stolen for each weight capacity from 0 to W.
Iterate through each item and update the array based on whether including the item would increase the total value.
The final value in the array at index W will be the maximum value that can be stolen.
- Q2.
Find the Second Largest Element
Given an array or list of integers 'ARR', identify the second largest element in 'ARR'.
If a second largest element does not exist, return -1.
Example:
Input:
ARR = [2,...
- Ans.
Find the second largest element in an array of integers.
Iterate through the array to find the largest and second largest elements.
Handle cases where all elements are identical.
Return -1 if a second largest element does not exist.
(1 Question)
Round duration - 60 Minutes
Round difficulty - Easy
System Design Round
- Q1. Design a system for Twitter, discussing its architecture, key components, and scalability considerations.
- Ans.
Design a scalable system for Twitter with key components and architecture.
Use microservices architecture for scalability and fault isolation.
Key components include user service, tweet service, timeline service, and notification service.
Use a distributed database like Cassandra for storing tweets and user data.
Implement a message queue like Kafka for handling real-time updates and notifications.
Use a caching layer like ...
Round duration - 30 Minutes
Round difficulty - Easy
It is just a formality
Interview Preparation Tips
Tip 1 : System Design
Tip 2 : Practice questions from leetcode
Tip 3 : Have some projects.
Tip 1 : Mention what you know
Tip 2 : Good previous work to showcase
Skills evaluated in this interview
I appeared for an interview in Feb 2025.
Data Structures, Coding MCQs
(2 Questions)
- Q1. What is Data Structure
- Q2. Write DFS Algorithm
- Ans.
Depth-First Search (DFS) is a graph traversal algorithm that explores as far as possible along each branch before backtracking.
DFS uses a stack data structure, either explicitly or via recursion.
It starts from a selected node and explores each branch before backtracking.
Example: In a binary tree, DFS can be implemented using pre-order, in-order, or post-order traversal.
DFS can be used to find connected components in a ...
Interview Preparation Tips
Deepak Sen
Selected
I applied via Campus Placement and was interviewed before Sep 2023. There were 2 interview rounds.
Basic coding only not to worry much
(2 Questions)
- Q1. Tell me about ur self
- Ans.
I am a passionate software developer with experience in Java, Python, and web development.
Experienced in Java, Python, and web development technologies
Strong problem-solving skills
Excellent team player with good communication skills
- Q2. What is ur projects
- Ans.
I have worked on various projects including a web-based inventory management system and a mobile app for tracking fitness goals.
Developed a web-based inventory management system using React and Node.js
Created a mobile app for tracking fitness goals using Flutter
Implemented RESTful APIs for communication between frontend and backend systems
Interview Preparation Tips
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