Walmart SDE (Software Development Engineer) Interview Questions, Process, and Tips

2 DSA questions and some MCQ on Java and Spring

Q1. Longest palindromic substring
Ans. 
A palindromic substring is a string that reads the same forwards and backwards.
• Use dynamic programming to find the longest palindromic substring.

• Start by considering each character as the center of a potential palindrome.

• Expand outwards from each center to check for palindromes of odd and even lengths.
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Q2. Remove duplicates in place from a 1D array
Ans. 
Remove duplicates from a 1D array of strings in place
• Iterate through the array and use a HashSet to keep track of unique elements

• Replace duplicates with null or an empty string to remove them in place
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Q1. Project discussion
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Q2. Search min element in a rotated sorted array with duplicate elements
Ans. 
Search for the minimum element in a rotated sorted array with duplicate elements.
• Use binary search to find the minimum element in the rotated sorted array.

• Handle the case where duplicate elements are present by adjusting the search conditions.

• Consider cases where the array is not rotated or contains only one element.
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Q3. Ways of declaring singleton class
Ans. 
A singleton class is a class that can only have one instance created throughout the application.
• Declare a private static instance variable of the class

• Create a private constructor to prevent external instantiation

• Provide a public static method to access the instance
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Q1. Project discussion
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Q2. Behavioural questions
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Good question but very simple to answer

Q1. Cooding question
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Q2. About project you did in colly
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Q1. Scenerio based questions
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Q1. Linked List Intersection Point
Ans. 
Find the intersection point of two linked lists.
• Use two pointers to traverse the linked lists

• Calculate the difference in length between the two lists

• Move the pointer of the longer list ahead by the difference

• Move both pointers simultaneously until they meet at the intersection point
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Q2. Basic Spring Boot
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Q3. Stream and Java 8 Questions
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Was easy to crack infact was simple

Involve group of 8 and related to come and pros

Q1. What are software testing techniques
Ans. 
Software testing techniques are methods used to ensure that software applications are functioning correctly and meeting requirements.
• Black box testing: Testing the functionality of a software application without knowing its internal code.

• White box testing: Testing the internal code and structure of a software application.

• Unit testing: Testing individual units or components of a software application.

• Integration testing:...read more
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