100+ Interview Questions and Answers

Find the subset of an array with the largest sum of continuous positive numbers.

• Iterate through the array and keep track of the current sum and the maximum sum seen so far.

• If the current element is positive, add it to the current sum. If it is negative, reset the current sum to 0.

• Also keep track of the start and end indices of the maximum sum subset.

• Return the subset using the start and end indices.

To determine high drop-off rates in e-commerce user flow, use analytics tools and A/B testing to identify and fix issues.

• Use analytics tools like Google Analytics to track user behavior and identify points of drop-off

• Conduct A/B testing to experiment with different solutions and determine which is most effective

• Address issues such as slow page load times, confusing navigation, and lack of trust signals

• Offer incentives such as free shipping or discounts to encourage users to c...read more

It is not possible to accurately guess the number of people in ISB's cafeteria without available data.

• Without available data, it is impossible to estimate the number of people in the cafeteria.

• The number of people in the cafeteria can vary greatly depending on the time of day and other factors.

• To provide an accurate estimate, data such as the cafeteria's capacity and current occupancy would be needed.

Find smallest substring in s1 containing all characters of s2.

• Create a hash table of characters in s2

• Use sliding window technique to find smallest substring in s1

• Check if all characters in s2 are present in the substring

• Update the smallest substring if a smaller one is found

Program to find all possible combinations of elements from two sets of arrays such that the sum of elements is equal to one of the elements in the array itself.

• Create two arrays of integers

• Loop through both arrays and find all possible combinations

• Check if the sum of elements is equal to any element in the array

• Return all combinations that meet the criteria

I would add a feature for scheduling messages and improve the privacy settings while removing the 'forwarded' label.

• Add a scheduling feature for messages to be sent at a later time

• Improve privacy settings by allowing users to control who can add them to groups

• Remove the 'forwarded' label to reduce the spread of misinformation

Ajax is a technique for creating fast and dynamic web pages. AngularJS is a framework for building dynamic web applications, while jQuery is a library for simplifying HTML DOM traversal and manipulation.

• Ajax stands for Asynchronous JavaScript and XML

• It allows web pages to be updated asynchronously by exchanging data with a web server behind the scenes

• AngularJS is a JavaScript framework that extends HTML with new attributes and makes it more responsive to user actions

• It provid...read more

Lazy loading is a technique used to defer the loading of non-critical resources until they are needed.

• Advantages: faster initial page load, reduced bandwidth usage, improved user experience

• Disadvantages: increased complexity, potential for slower subsequent page loads, difficulty with SEO

• Examples: images, videos, and other media files can be loaded only when they are visible on the screen

Given n starting with all 1, find the kth number.

• The kth number is obtained by incrementing the binary representation of n.

• Repeat until k-1 increments are done.

• Return the final value of n.

Program to find the next bigger number for the given number by interchanging its digits.

• Convert the number to a string to access individual digits

• Start from the rightmost digit and find the first digit that is smaller than the digit to its right

• Swap this digit with the smallest digit to its right that is greater than it

• Sort the digits to the right of the swapped digit in ascending order

• Convert the string back to a number and return

Sharing data insights can help improve services and identify revenue opportunities.

• Analyzing customer behavior can help identify areas for improvement

• Identifying trends in sales data can help optimize pricing strategies

• Using data to personalize marketing efforts can increase customer engagement

• Predictive modeling can help identify potential revenue opportunities

• Tracking key performance indicators can help optimize business operations

RedBus can enter Indonesian market by targeting the growing middle class and partnering with local bus operators.

• Conduct market research to identify target audience and competition

• Partner with local bus operators to expand network and gain local expertise

• Offer competitive pricing and promotions to attract customers

• Invest in marketing and advertising to increase brand awareness

• Ensure seamless user experience through website and mobile app

• Consider offering additional services s...read more

Find the smallest window in a string containing all characters of another string.

• Use a sliding window approach to find the smallest window

• Create a frequency map of characters in the second string

• Slide the window and update the frequency map until all characters are found

• Track the minimum window size and indices

Redux is a predictable state container for JavaScript apps. Event loop, call stack, and callback queue manage asynchronous operations. let, const, var differ in variable scoping and reassignment. setTimeout delays execution. 'this' refers to the current context. Scoping determines variable accessibility.

• Redux is a state management tool for JavaScript apps, ensuring predictable state changes.

• Event loop manages the execution of callback functions, while call stack keeps track o...read more

Use a hash set to store seen numbers and check if the complement of current number is in the set.

• Iterate through the array and for each number, check if the complement of the current number is in the hash set.

• If the complement is found, return true. Otherwise, add the current number to the hash set.

• Repeat this process for all numbers in the array.

• Example: Array [1, 2, 3, 4, 5] and Sum 9 should return true as 4 + 5 = 9.

Salespeople should have good communication skills, be persistent, knowledgeable, and empathetic.

• Excellent communication skills

• Persistence and determination

• Product and industry knowledge

• Empathy and emotional intelligence

• Ability to build relationships

• Negotiation skills

• Time management and organization

• Adaptability and flexibility

Function overloading and overriding are concepts in object-oriented programming that involve the use of multiple functions with the same name.

• Function overloading refers to the ability to have multiple functions with the same name but different parameters in a class.

• Function overriding refers to the ability to have a derived class provide a different implementation of a method that is already defined in its base class.

• Overloading is resolved at compile-time based on the numbe...read more

A digital video streaming service with GTM and monetization.

• Develop a user-friendly platform with a wide range of video content.

• Implement a robust content delivery network (CDN) for seamless streaming.

• Offer personalized recommendations based on user preferences and viewing history.

• Integrate social sharing features to enhance user engagement.

• Implement a subscription-based model with tiered pricing options.

• Leverage targeted advertising to generate additional revenue.

• Collaborate...read more

Reverse the second half of a linked list efficiently.

• Find the middle node of the linked list

• Reverse the second half of the linked list using a pointer

• Update the pointers to connect the reversed second half with the first half

Deadlocks occur when two or more processes are waiting for each other to release resources, leading to a standstill.

• 4 conditions of Deadlocks: mutual exclusion, hold and wait, no preemption, circular wait

• Preventing Deadlocks: using a proper resource allocation strategy, implementing timeouts, avoiding circular wait, using deadlock detection and recovery algorithms

• Example: Two processes each holding a resource and waiting for the other to release the resource, causing a deadlo...read more

To increase Netflix's revenue by 10x, we can focus on expanding the subscriber base, increasing subscription prices, and diversifying revenue streams.

• Expand the subscriber base by targeting new markets and demographics

• Increase subscription prices for premium features or exclusive content

• Diversify revenue streams through partnerships, merchandise sales, or live events

Replace substring in a given string and print the remaining string

• Use string.replace() method to replace the substring

• Print the remaining string using string slicing

Yes, Google AdWords is an online advertising platform developed by Google.

• Google AdWords allows businesses to create and display ads on Google's search engine results pages and other websites.

• It works on a pay-per-click model, where advertisers bid on keywords and pay for each click on their ads.

• AdWords also offers various targeting options, such as location, language, device, and audience demographics.

• It has now been rebranded as Google Ads and includes additional advertisin...read more

The success of Google Pay can be measured through user adoption rates, transaction volume, customer satisfaction, and revenue generated.

• User adoption rates: Tracking the number of users who have downloaded and actively use the Google Pay app.

• Transaction volume: Monitoring the total value and frequency of transactions processed through Google Pay.

• Customer satisfaction: Conducting surveys or analyzing feedback to gauge user satisfaction with the app's features and performance.

• R...read more

Customer service is the provision of assistance and support to customers before, during, and after purchase.

• Customer service involves actively listening to customers and addressing their concerns

• It is important to provide timely and accurate information to customers

• Going above and beyond to exceed customer expectations is a key aspect of customer service

• Customer service can help build long-term relationships with customers and increase customer loyalty

• Examples of good custome...read more

To check if a linked list is a palindrome, compare the first half of the list with the reversed second half.

• Traverse the linked list to find the middle element using slow and fast pointers.

• Reverse the second half of the linked list.

• Compare the first half with the reversed second half to check for palindrome.

Use dynamic programming to find the minimum steps to convert string a to b by deletion, insertion, or replacement.

• Create a 2D array to store the minimum steps required to convert substrings of a to substrings of b.

• Initialize the array with base cases for empty strings and iterate through the rest of the array to fill in the values based on previous calculations.

• The final value in the bottom right corner of the array will be the minimum steps required to convert the entire str...read more

Algorithm to reverse a linked list

• Create a new empty linked list

• Traverse the original linked list and insert each node at the beginning of the new list

• Return the new list

DNS is a system that translates domain names to IP addresses, allowing users to access websites using human-readable names.

• DNS is like a phone book for the internet, translating domain names (e.g. google.com) to IP addresses (e.g. 172.217.3.206).

• DNS servers store records that map domain names to IP addresses, helping users navigate the internet.

• DNS also helps with email delivery by translating domain names in email addresses to IP addresses for routing purposes.

Develop a 5-year strategy for MakeMyTrip.

• Expand into new markets and increase customer base

• Invest in technology to improve user experience and streamline operations

• Offer personalized travel packages and loyalty programs

• Partner with airlines and hotels to offer exclusive deals

• Focus on sustainability and responsible tourism

• Explore opportunities in emerging technologies like AI and blockchain

MySQL is a relational database management system, while NoSQL databases are non-relational databases.

• MySQL is a traditional relational database that uses tables to store data and SQL for querying.

• NoSQL databases are non-relational and can be document-based, key-value pairs, wide-column stores, or graph databases.

• MySQL is ACID-compliant and suitable for complex queries and transactions.

• NoSQL databases are often used for large-scale distributed data storage and processing.

• Examp...read more

GST stands for Goods and Services Tax, a tax levied on the supply of goods and services in India.

• GST is a comprehensive indirect tax that has replaced many indirect taxes in India.

• It is levied on the value-added to goods and services at each stage of the supply chain.

• GST on commission refers to the tax levied on the commission earned by a person or entity for providing services.

• The rate of GST on commission varies depending on the type of service provided.

• For example, the GST...read more

Merge two strings diagonally in a Java array of strings.

• Iterate through each row and column to merge characters diagonally

• Keep track of the diagonal position to insert characters from both strings

• Handle cases where strings have different lengths

• Example: String 1: 'hello', String 2: 'world', Merged: 'hweolrllod'

• Example: String 1: 'abc', String 2: '123', Merged: 'a1b2c3'

A traffic light system controls the flow of traffic at intersections.

• The system consists of three lights: red, yellow, and green.

• Each light has a specific duration for which it stays on.

• The system also includes sensors to detect the presence of vehicles and pedestrians.

• The duration of each light can be adjusted based on traffic patterns.

• The system can be connected to a central control system for remote monitoring and management.

Teach computer basics through hands-on activities and interactive lessons.

• Start with the basics of hardware and software

• Introduce programming concepts through block-based coding

• Encourage exploration and experimentation with different programs and tools

• Teach internet safety and responsible use

• Provide opportunities for students to collaborate and problem-solve

• Use real-world examples to demonstrate the practical applications of computer science

Google's revenue model is primarily based on advertising through its search engine and other platforms.

• Google earns revenue through its AdWords program, where advertisers bid on keywords to display their ads in search results and other Google platforms.

• Google also earns revenue through its AdSense program, where website owners can display Google ads on their sites and earn a share of the revenue.

• Other sources of revenue for Google include cloud services, hardware sales, and a...read more

An app similar to Uber for kids, providing safe and reliable transportation services for children.

• Parents can schedule rides for their children through the app

• Drivers are thoroughly vetted and background checked for safety

• Real-time tracking and notifications for parents to monitor their child's journey

• Option for parents to set restrictions on drop-off locations and who can pick up the child

• Emergency contact feature for parents and drivers to communicate in case of any issues

To debug a 500 error, check server logs, review code changes, test API endpoints, and use debugging tools.

• Check server logs for error details

• Review recent code changes that may have caused the error

• Test API endpoints using tools like Postman

• Use debugging tools like Chrome DevTools or Firebug

I have excellent communication skills, strong leadership abilities, and extensive experience in the travel industry.

• Strong communication skills, both verbal and written

• Leadership abilities and experience managing teams

• Extensive knowledge and experience in the travel industry

• Ability to analyze data and make informed decisions

• Excellent customer service skills

• Proficiency in relevant software and technology

• Flexibility and adaptability to changing situations

• Multilingual abilities

• A...read more

Reverse a linked list in groups of n

• Create a function that takes a linked list and a group size as input

• Iterate through the linked list, reversing each group of nodes

• Keep track of the previous and current node to update the pointers

• Handle cases where the group size is larger than the remaining nodes

• Return the head of the reversed linked list

Understanding how the role functions and the responsibilities involved.

• The role involves providing support to customers, addressing their queries and concerns.

• Requires strong communication skills to effectively interact with customers.

• Involves troubleshooting technical issues and providing solutions.

• May require working in a team to ensure customer satisfaction.

• Understanding company products/services to better assist customers.

• Continuous learning and updating knowledge to stay...read more

Autosuggest debounce is a feature that delays the search suggestions until the user stops typing, and a polyfill is a piece of code that provides functionality that is not natively supported by the browser.

• Implement a debounce function to delay the autosuggest feature until the user stops typing.

• Use a polyfill to provide support for the autosuggest feature in browsers that do not natively support it.

• Example: Implement a debounce function that waits for 300ms after the user st...read more

Uber pool is beneficial as it reduces traffic congestion, lowers transportation costs, and promotes social interaction.

• Reduces traffic congestion by allowing multiple passengers to share a ride

• Lowers transportation costs for passengers as they split the fare

• Promotes social interaction by bringing people together who may not have otherwise met

• Increases efficiency by reducing the number of cars on the road

• Helps to reduce carbon emissions by reducing the number of cars on the ro...read more

Uber pool would fail if the demand for shared rides decreases or if the cost of providing the service becomes too high.

• Decrease in demand for shared rides

• Increase in cost of providing the service

• Competition from other ride-sharing services

• Regulatory changes affecting ride-sharing services

• Safety concerns or incidents

• Technological disruptions affecting the ride-sharing industry

Detect loop in a LinkedList

• Use two pointers, one moving at twice the speed of the other

• If there is a loop, the faster pointer will eventually catch up to the slower one

• If there is no loop, the faster pointer will reach the end of the list

End to end operation refers to the complete process from start to finish in a particular operation or project.

• Start with understanding client requirements

• Research and plan the trip itinerary

• Book flights, accommodations, and activities

• Provide necessary travel documents and information to the client

• Ensure smooth travel experience and handle any issues that may arise

• Follow up with the client for feedback and future bookings

Search for an element in a sorted rotated array

• Use binary search to find the pivot point where the array is rotated

• Then perform binary search on the appropriate half of the array to find the element

• Handle cases where the element is not found in the array

Find the maximum sum by picking corner elements of a matrix

• Start by selecting the four corner elements of the matrix

• Compare the sum of the diagonally opposite corners and choose the pair with the higher sum

• Repeat the process with the remaining elements until all corners are picked

Calculate the number of rows after joining two datasets.

• Count the number of rows in each dataset

• Perform the join operation

• Count the number of rows in the resulting dataset

Designing an elevator system involves considering factors like capacity, speed, efficiency, and safety.

• Consider the number of floors in the building and the expected traffic flow to determine the number of elevators needed.

• Choose between different elevator types such as hydraulic, traction, or machine-room-less based on building requirements.

• Implement a control system to optimize elevator movement and reduce wait times for passengers.

• Include safety features like emergency sto...read more