Walmart Software Developer II Interview Questions and Answers

Online coding test of 45 mins

Q1. BFS/DFS graph problem
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Q2. Inverted array problem
Ans. 
Inverted array problem involves reversing the order of elements in an array of strings.
• Iterate through the array from both ends and swap the elements until reaching the middle.

• Use a temporary variable to store the element being swapped.

• Example: Input array ['apple', 'banana', 'cherry'] should be inverted to ['cherry', 'banana', 'apple'].
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Q1. LLD design of order collection service
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LLD design of order collection service involves designing the detailed architecture of the service for collecting orders.
• Define the components of the order collection service such as order processing, validation, storage, and retrieval.

• Design the data flow between these components and how they interact with each other.

• Consider scalability, fault tolerance, and performance optimization in the design.

• Use appropriate desi...read more
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Q2. How two arrays represented as trees are identical trees
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Two arrays represented as trees are identical if they have the same structure and values at each node.
• Check if the arrays have the same length.

• Compare the root nodes of both trees.

• Recursively compare the left and right subtrees of both trees.
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Easy to medium level dsa questions

Q1. Connecting bridges from geeks for geeks. It is similar to longest increasing subsequence problem
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They asked me to create a live working project and sufficient time was provided.

Q1. Detailed discussion around the project created in round 1. Each and every details were asked and discussion on approach.
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Q1. This was final managerial round.
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Q1. A company FooBar has hosted an online auction system where any User(seller) can sell an object through an auction. Each auction has a lowest bid limit and highest bid limit. Any registered user(buyer) can ...read more
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Q1. Design a Movie Booking System
Ans. 
A movie booking system allows users to browse movies, select showtimes, choose seats, and make payments online.
• Users can search for movies by title, genre, or release date.

• Users can view showtimes, select seats, and add to cart.

• Users can make payments securely using various payment methods.

• Admin can manage movie listings, showtimes, and seating arrangements.

• System should send confirmation emails and tickets to users.
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Machine coding round 90 mins duration. Based on designing Buy Now Pay Later system

2 medium level questions

Q1. Design an online coding platform
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Round duration - 25 Minutes
Round difficulty - Medium

Very friendly interviewer. Although waiting time was very high

Q1. 
Pair Sum Problem Statement
You are given an integer array 'ARR' of size 'N' and an integer 'S'. Your task is to find and return a list of all pairs of elements where each sum of a pair equals 'S'.
Note:
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Ans. 
Find pairs of elements in an array that sum up to a given value, sorted in a specific order.
• Iterate through the array and for each element, check if the complement (S - current element) exists in a hash set.

• If the complement exists, add the pair to the result list.

• Sort the result list based on the criteria mentioned in the question.

• Return the sorted list of pairs.
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