20+ Walmart Interview Questions and Answers

Sort an array of 0's, 1's, and 2's using two pointer approach.

• Initialize two pointers, one at the beginning and one at the end of the array.

• Traverse the array and swap 0's to the beginning and 2's to the end using the pointers.

• Stop when the pointers meet or cross each other.

Search for an element in a rotated sorted array using binary search with pivot.

• Find the pivot element using binary search.

• Compare the target element with the first element of the array to determine which half to search.

• Perform binary search on the selected half of the array.

• Repeat until the target element is found or the array is exhausted.

ID selector is used to select an element with a specific ID attribute in CSS.

• ID selector is denoted by '#' followed by the ID name.

• ID should be unique on a page.

• ID selector has higher specificity than class selector.

• Example: #header { color: blue; }

Search an element in an infinite sorted array using binary search.

• Initialize low as 0 and high as 1.

• Double the high index until arr[high] is greater than the target element.

• Perform binary search between low and high indexes.

ShallowCopy copies only the reference of an object while DeepCopy creates a new object with a new reference.

• ShallowCopy creates a new reference to the same object, so changes made to the copy will reflect in the original object.

• DeepCopy creates a new object with a new reference, so changes made to the copy will not reflect in the original object.

• ShallowCopy is faster and less memory-intensive than DeepCopy.

• DeepCopy is necessary when you need to modify the copied object withou...read more

Struct is a value type while class is a reference type in C#.

• Structs are stored on the stack while classes are stored on the heap.

• Structs cannot be inherited while classes can be inherited.

• Structs do not support destructors while classes do.

• Structs are used for small data structures while classes are used for larger, more complex objects.

• Example of struct: struct Point { public int X; public int Y; }

• Example of class: class Person { public string Name; public int Age; }

Copy constructor is a special constructor that creates a new object by copying an existing object.

• It is used to create a new object with the same values as an existing object.

• It takes an object of the same class as a parameter.

• It is automatically called when a new object is created from an existing object.

• It creates a deep copy of the object, meaning that all the member variables are copied.

• Example: class MyClass { public: MyClass(const MyClass& obj) { // copy constructor cod...read more

I will implement dynamic pricing and incentivize drivers to work during peak hours.

• Implement dynamic pricing to encourage more drivers to work during peak hours

• Incentivize drivers with bonuses or higher pay during peak hours

• Partner with other transportation companies to increase the supply of available vehicles

• Use data analysis to predict peak times and adjust supply accordingly

• Offer alternative modes of transportation such as bikes or scooters during peak hours

Operator overloading allows operators to have different meanings based on the context of their usage.

• Operator overloading is a feature in object-oriented programming languages.

• It allows operators to be redefined for custom classes.

• For example, the '+' operator can be overloaded to concatenate strings or add numbers.

• It can improve code readability and reduce the amount of code needed for certain operations.

To build a bottle for a billionaire baby, focus on luxury materials, unique design, and advanced technology.

• Use high-quality materials such as gold, silver, or crystal to create a luxurious feel.

• Incorporate a unique and stylish design that sets it apart from regular baby bottles.

• Include advanced technology features like temperature control or self-cleaning capabilities.

• Offer customization options such as engraving the baby's name or birthdate for a personalized touch.

Design a reporting analytics system for the organization

• Identify key metrics to track

• Determine data sources and integrate them into a centralized database

• Develop a user-friendly dashboard for data visualization

• Implement automated reporting and alerting

• Ensure data security and privacy

• Continuously evaluate and improve the system

Improve Google Maps by enhancing real-time traffic updates and integrating public transportation options.

• Enhance real-time traffic updates to provide more accurate and timely information to users

• Integrate public transportation options for seamless navigation between driving and public transit

• Improve user interface for easier navigation and search functionality

A Lambada function is an anonymous function that can be defined in a single line of code and passed as an argument to other functions.

• Lambada functions are commonly used in functional programming languages like Python and JavaScript.

• They are often used for tasks that require a short, simple function without the need to define a separate named function.

• Example: lambda x: x*2 defines a Lambada function that doubles the input value x.

A load balancer distributes incoming network traffic across multiple servers to ensure optimal resource utilization and prevent overload.

• Distributes incoming traffic evenly across servers

• Monitors server health and redirects traffic away from unhealthy servers

• Improves reliability and scalability of applications

• Examples: Nginx, HAProxy, AWS Elastic Load Balancer

APIs are sets of rules and protocols that allow different software applications to communicate with each other. A browser works by sending requests to servers to retrieve and display web pages.

• APIs are sets of rules and protocols that allow different software applications to communicate with each other.

• They define the methods and data formats that applications can use to request and exchange information.

• Examples of APIs include the Google Maps API, which allows developers to ...read more

Design IMDB with concurrent ratings management

• Implement a locking mechanism to ensure only one user can update a rating at a time

• Use a queue system to handle multiple rating requests in an orderly manner

• Consider using distributed systems to handle high concurrency levels

Bad debt refers to money owed by a debtor that is unlikely to be paid back, resulting in a loss for the creditor.

• Bad debt is typically the result of customers defaulting on their payments.

• It is recorded as an expense on the creditor's financial statements.

• Companies may write off bad debts to remove them from accounts receivable.

• Examples include unpaid invoices, loans that are not repaid, and credit card debt that goes into default.

Fetch leaderboard ranking for a given user and neighbors, handle huge dataset

• Use a distributed system like Hadoop or Spark to handle the huge dataset

• Implement a ranking algorithm to efficiently fetch the leaderboard

• Retrieve the ranking for the given user and fetch 5 users above and below

• Ensure the solution is scalable and can handle increasing data size

Design a milk bottle for 6-month-old babies that is easy to hold and clean.

• The bottle should have a small nipple to fit the baby's mouth

• The bottle should be made of BPA-free materials

• The bottle should have a wide base for stability

• The bottle should be easy to clean and sterilize

• The bottle should have measurement markings for accurate feeding

Design a vehicle rental system API

• Create endpoints for listing available vehicles, booking a vehicle, and returning a vehicle

• Include authentication and authorization mechanisms for users and admins

• Implement payment gateway integration for processing rental payments

• Include features like vehicle search, filtering, and reviews/ratings

• Consider scalability and performance optimizations for handling high traffic

Use a loop to search for a specific string in an array of strings.

• Iterate through each string in the array

• Use a conditional statement to check if the current string matches the search string

• Return the index of the matching string or -1 if not found

Stock span problem is a financial problem where we have a series of n daily price quotes for a stock and we need to calculate the span of stock's price for all n days.

• Use a stack to keep track of the previous days' prices and their spans.

• For each day, pop the stack until a price greater than the current day's price is found, then calculate the span.

• Push the current day's price and span onto the stack.

Search for a target value in a rotated sorted array.

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

• Determine which half of the array the target value lies in based on the pivot point.

• Continue binary search in the appropriate half of the array to find the target value.

A job scheduler is a software application that manages the scheduling of tasks or jobs to be executed by a computer system.

• Define the job scheduling requirements such as priority, deadline, resource constraints, etc.

• Implement a scheduling algorithm like First Come First Serve, Shortest Job First, Round Robin, etc.

• Maintain a queue of jobs to be executed and allocate resources accordingly.

• Monitor job execution and handle any exceptions or errors that may occur.

• Optimize the sche...read more