Walmart Labs Interview Questions, Process, and Tips

Q1. Array based question
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Q2. DP based question
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Q1. Internal implementation of HashMap
Ans. 
HashMap is implemented using an array of linked lists to store key-value pairs.
• HashMap consists of an array of buckets, each containing a linked list of key-value pairs.

• Hashing function is used to determine the index of the bucket where a key-value pair will be stored.

• Collision resolution techniques like chaining or open addressing are used to handle collisions.

• HashMap allows null keys and values, but only one null key
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Q2. In depth javascript concepts
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Q1. Project based discussion
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Q2. Design for a date picker in javascript
Ans. 
A date picker in JavaScript allows users to select a date from a calendar interface.
• Use HTML input element with type 'date' for modern browsers

• For older browsers, use a JavaScript library like jQuery UI Datepicker

• Implement validation to ensure selected date is within acceptable range
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10 random qs on software things, and 2 qs leetcode style one easy and one easy medium

Leetcode Medium - Arrays, HashMaps

Q1. They asked knapsack problem
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Q2. They asked reverse linked list
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Q1. Implement Stack using Queue.
Ans. 
Implement a stack using a queue data structure.
• Use two queues to simulate a stack.

• Push operation: Enqueue the element to queue 1.

• Pop operation: Dequeue all elements from queue 1 to queue 2, dequeue the last element from queue 2.

• Top operation: Return the front element of queue 1.

• Empty operation: Check if both queues are empty.
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Q2. Use two thread two print From 1 to 10 where Thread A will be for odd and Thread B will be for even.
Ans. 
Use two threads to print numbers 1 to 10, with Thread A printing odd numbers and Thread B printing even numbers.
• Create two threads, one for odd numbers and one for even numbers

• Use a shared variable to keep track of the current number being printed

• Use synchronization mechanisms like mutex or semaphore to ensure proper sequencing of numbers
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Q1. Find the subarray with given sum.
Ans. 
Find subarray with given sum in an array of integers.
• Use a sliding window approach to find subarray with sum equal to given sum.

• Keep track of current sum and adjust window size accordingly.

• Return the indices of the subarray if found, else return an empty array.
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Q2. Java concurrency question
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Q1. Questions based on bst
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Q1. Mostly managerial questions
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Q1. Easy DP questions
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Q1. Write java code for given problem
Ans. 
Java code to find the longest common prefix among an array of strings
• Create a function that takes in an array of strings as input

• Initialize a variable to store the longest common prefix

• Iterate through the characters of the first string and compare with the corresponding characters of other strings

• Return the longest common prefix
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Q1. About existing project and architecture
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