Walmart Labs Interview Questions and Answers

10 random qs on software things, and 2 qs leetcode style one easy and one easy medium

Q1. How to check log
Ans. 
To check logs, analyze log files for errors, warnings, and relevant information to troubleshoot issues effectively.
• Identify the log file location, e.g., /var/log/syslog for system logs.

• Use tools like grep to filter logs for specific keywords, e.g., 'grep error /var/log/syslog'.

• Check timestamps to correlate events, e.g., 'tail -n 100 /var/log/syslog' for the latest entries.

• Look for patterns or repeated errors that may i...read more
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Q2. Explain pipelines of Jenkin
Ans. 
Jenkins pipelines automate the process of building, testing, and deploying applications in a continuous integration/continuous delivery environment.
• Declarative vs. Scripted: Declarative pipelines use a simpler syntax, while scripted pipelines offer more flexibility.

• Stages: Pipelines are divided into stages, such as 'Build', 'Test', and 'Deploy', to organize the workflow.

• Parallel Execution: Jenkins allows stages to run ...read more
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Leetcode Medium - Arrays, HashMaps

Q1. They asked knapsack problem
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Q2. They asked reverse linked list
Ans. 
Reversing a linked list involves changing the direction of its nodes to point backward instead of forward.
• Iterative approach: Use three pointers (prev, current, next) to reverse the links.

• Example: For list 1 -> 2 -> 3, after reversal it becomes 3 -> 2 -> 1.

• Recursive approach: Reverse the rest of the list and adjust the pointers accordingly.

• Example: Base case when current is null, then set head to prev.
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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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