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Find the longest substring in a string that contains all unique characters.
Use a sliding window approach to track the current substring.
Utilize a hash set to store characters and check for duplicates.
Expand the window by moving the right pointer and contract by moving the left pointer when duplicates are found.
Example: For 'abcabcbb', the longest substring is 'abc' with length 3.
I am a results-driven Technical Lead with a passion for innovation, team empowerment, and delivering high-quality software solutions.
Proven track record of leading cross-functional teams to deliver projects on time and within budget, such as a recent cloud migration project.
Strong expertise in Agile methodologies, having successfully implemented Scrum practices that improved team productivity by 30%.
Mentored junio...
Merchandising involves promoting products at retail locations to enhance sales through strategic presentation and marketing techniques.
In-store displays: Attractive product arrangements to catch customer attention.
Point of purchase promotions: Discounts or offers placed near checkout areas.
Seasonal merchandising: Tailoring displays to align with holidays or seasons, like Christmas decorations.
Cross-merchandising: ...
KYC stands for Know Your Customer, a process to verify the identity of clients to prevent fraud and ensure compliance.
KYC is essential for financial institutions to prevent money laundering.
It involves collecting personal information like name, address, and identification.
For example, banks require KYC to open a new account.
KYC processes can include document verification and risk assessment.
Regulatory bodies manda...
A merchant is an individual or business engaged in the trade of goods or services, often for profit.
Merchants can be wholesalers, retailers, or online sellers.
Examples include grocery store owners, e-commerce platforms like Amazon, and street vendors.
They play a crucial role in the supply chain by connecting producers with consumers.
Merchants often negotiate prices and terms with suppliers to maximize profit.
Experience cutting-edge technology with this sleek mobile, designed for performance, style, and seamless connectivity.
High-resolution camera: Capture stunning photos with a 108MP camera, perfect for both casual and professional photography.
Long-lasting battery: Enjoy all-day usage with a 5000mAh battery, ensuring you stay connected without frequent charging.
Fast performance: Powered by the latest processor, this m...
Balancing customer needs with business goals is key; prioritize value while ensuring profitability.
Understand customer pain points: Conduct surveys to identify what customers truly need.
Offer tailored solutions: Customize products to meet specific customer requirements, enhancing satisfaction.
Build long-term relationships: Focus on customer loyalty through excellent service and follow-ups.
Educate customers: Provid...
I follow a collaborative and agile working module, focusing on communication, adaptability, and continuous improvement.
Emphasize teamwork: I regularly engage with cross-functional teams to ensure alignment on project goals.
Agile methodology: I utilize sprints to break down projects into manageable tasks, allowing for flexibility and quick adjustments.
Regular feedback loops: I implement bi-weekly check-ins to gathe...
Building a big business requires strategic planning, innovation, and effective execution to capture market opportunities.
Identify a unique value proposition: Offer something that sets your business apart, like Tesla's electric vehicles.
Conduct thorough market research: Understand customer needs and market trends, similar to how Netflix adapted from DVD rentals to streaming.
Develop a scalable business model: Create...
I can enhance Paytm's growth through innovative strategies, customer engagement, and leveraging technology for seamless transactions.
Implement advanced data analytics to understand customer behavior and tailor services accordingly.
Expand partnerships with local businesses to increase merchant adoption and enhance user experience.
Introduce loyalty programs that reward frequent users, encouraging repeat transactions...
Arrays have fixed size and can lead to memory wastage and performance issues.
Arrays have a fixed size and cannot be resized dynamically.
Inserting or deleting elements in an array can be time-consuming.
Arrays can lead to memory wastage if they are not fully utilized.
Arrays can cause performance issues if they are too large and need to be traversed frequently.
Arrays can also be prone to buffer overflow attacks.
Example: A...
Function to hide text on mouse click in JavaScript
Create a function that takes an element as input
Add an event listener to the element for a mouse click
Toggle the element's display property between 'none' and its original value
Find two elements in an unsorted array whose sum is equal to a given number x.
Use a hash table to store the difference between x and each element in the array.
Iterate through the array and check if the current element is in the hash table.
Return the pair of elements that add up to x.
Number of possible BSTs with 2 and 3 nodes.
For 2 nodes, only 2 BSTs are possible.
For 3 nodes, 5 BSTs are possible.
Number of BSTs can be calculated using Catalan numbers formula.
Catalan(2) = 2, Catalan(3) = 5.
Answering the question about possible trees with two and three nodes.
For two nodes, there is only one possible tree.
For three nodes, there are three possible trees.
The formula for calculating the number of possible trees with n nodes is (2n-3)!!.
The double exclamation mark represents the double factorial function.
The double factorial function is defined as n!! = n(n-2)(n-4)...(1 or 2).
B+ trees are balanced trees used for indexing and searching large amounts of data.
B+ trees are similar to binary search trees but have multiple keys per node.
They are commonly used in databases and file systems.
B+ trees have a high fanout, reducing the number of disk accesses required for searching.
They are also self-balancing, ensuring efficient performance even with large amounts of data.
Example: In a database, a B+ ...
Find minimum no of platforms required to avoid collision between trains based on their arrival and departure times.
Sort both arrays in ascending order
Initialize platform count and max count to 1
Loop through both arrays and compare arrival and departure times
If arrival time is less than or equal to departure time, increment platform count
Else, decrement platform count
Update max count if platform count is greater than ma...
JVM stands for Java Virtual Machine. It is an abstract machine that provides a runtime environment for Java programs.
JVM is responsible for interpreting the compiled Java code and executing it.
It provides platform independence by converting bytecode into machine-specific code.
JVM has various components like class loader, bytecode verifier, and execution engine.
Compiler converts source code into bytecode, while JVM exec...
Creating a SQL query based on a given relational schema and problem statement.
Understand the schema: Identify tables, columns, and relationships.
Clarify the problem statement: Determine what data is needed.
Write the SQL query: Use SELECT, JOIN, WHERE clauses as necessary.
Test the query: Ensure it returns the expected results.
Optimize if needed: Check for performance improvements.
PayTM is an Indian e-commerce payment system and digital wallet company.
PayTM was founded in 2010 by Vijay Shekhar Sharma.
It started as a mobile recharge and bill payment platform.
PayTM has expanded to offer services like online shopping, movie ticket booking, and travel bookings.
It also offers a digital wallet that can be used to pay for various services and products.
PayTM has over 350 million registered users and is ...
I would like to add a feature for splitting bills among friends.
The feature would allow users to split bills for movies, dinners, etc.
Users can select friends from their contact list and split the bill equally or unequally.
The app would send a notification to the selected friends to pay their share.
The feature would make it easier for users to split expenses and avoid awkward conversations.
It would also encourage more ...
My favourite app is Spotify. I would like to see improvements in the algorithm for personalized playlists.
Improved algorithm for personalized playlists
Better integration with social media platforms
Option to create collaborative playlists with friends
I choose NIT Hamirpur because of its excellent academic reputation and beautiful campus.
NIT Hamirpur has a strong focus on academics and research, which aligns with my career goals.
The campus is located in a serene and picturesque location, which provides a conducive environment for learning.
The faculty members are highly experienced and knowledgeable, and are always willing to help students.
The college has state-of-th...
I appeared for an interview in Jan 2025, where I was asked the following questions.
I appeared for an interview in Jan 2025.
Yes, it is important to carry a hardcopy of your CV for reference during the interview.
Having a hardcopy shows preparedness and professionalism.
Allows for easy reference during the interview.
Can be shared with the interviewer if needed.
Shows attention to detail and organization.
Demonstrates respect for the interviewer's time.
I applied via Referral and was interviewed in Dec 2024. There was 1 interview round.
Handling a team involves effective communication, delegation, motivation, and conflict resolution.
Establish clear goals and expectations for the team
Communicate openly and regularly with team members
Delegate tasks based on team members' strengths and skills
Provide feedback and recognition for good work
Address conflicts and issues promptly and fairly
Lead by example and demonstrate a positive attitude
Encourage collaborat...
Recruit team members based on skills, experience, and cultural fit.
Identify the specific skills and experience needed for the team
Utilize various recruitment channels such as job boards, social media, and employee referrals
Conduct thorough interviews to assess candidates' qualifications and cultural fit
Consider diversity and inclusion when selecting team members
I appeared for an interview in Dec 2024.
The Longest Substring Without Repeating Characters problem involves finding the length of the longest substring without any repeating characters.
Best solution: Sliding Window approach with HashSet to track unique characters. Time complexity O(n), space complexity O(min(n, m)) where n is the length of the string and m is the size of the character set.
Worst solution: Brute force approach checking all substrings for uniqu...
I appeared for an interview in Dec 2024.
This is a HackerEarth coding test that consists of 20 or 22 basic questions focused on iOS and Swift, along with two data structure and algorithm problem-solving questions; one of these is challenging, while the other is easier.
Use asynchronous image loading to display 'n' images in a table view efficiently.
Use SDWebImage or AlamofireImage libraries for asynchronous image loading.
Store image URLs in an array and load images dynamically as cells are displayed.
Implement caching mechanism to avoid reloading images every time a cell is displayed.
I applied via Company Website and was interviewed in Oct 2024. There were 3 interview rounds.
Hackerrank - 2 question
I applied via Referral and was interviewed in Oct 2024. There were 2 interview rounds.
Speaking well in group discussion Explain To boys how to understand customers
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The duration of Paytm interview process can vary, but typically it takes about less than 2 weeks to complete.
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Senior Associate
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