LambdaTest Software Development Engineer Interview Questions and Answers

A 90-minute coding test on HackerRank, which includes one medium, one easy, and one hard question.

Q1. What is the index of the first occurrence where a pattern string matches with a text string?
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Q2. Given a string, how can we find the minimum length substring whose sum is greater than or equal to a specified target?
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2 Leetcode Medium questions on hackerrank

Q1. Kadane algorithm based question
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Q2. Leetcode medium
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Q3. Resume based questions
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Q1. Probability question math problem
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Q2. Puzzle to solve
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Q3. AI based question
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Q4. 1 question to solve Leetcode medium
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Medium to hard questions based on arrays, dp

Q1. Quick sort algorithm
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Quick sort is a popular sorting algorithm that uses divide and conquer strategy.
• Divides array into smaller sub-arrays based on a pivot element

• Recursively sorts sub-arrays

• Combines sorted sub-arrays to get final sorted array

• Time complexity: O(n log n) on average, O(n^2) worst case

• Example: [3, 6, 8, 10, 1, 2, 1] -> [1, 1, 2, 3, 6, 8, 10]
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Q2. Modified rotate a matrix
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Rotate a matrix by 90 degrees in place
• Transpose the matrix

• Reverse each row of the transposed matrix
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Aptitude was including both MCQs and Input

Q1. Technical interview 1 It revolved around core subjects Like OS, Oops, CNS, dbms etc,. And few basic questions on arrays
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Q2. Difference between python and C
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Python is a high-level, interpreted language known for its simplicity and readability, while C is a low-level, compiled language known for its speed and efficiency.
• Python is dynamically typed, while C is statically typed.

• Python has automatic memory management, while C requires manual memory management.

• Python is platform-independent, while C is platform-dependent.

• Python is commonly used for web development and data anal...read more
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Q3. Why C is faster than python
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C is faster than Python due to its lower-level nature and direct hardware access.
• C is a compiled language, while Python is an interpreted language.

• C code is directly translated into machine code, while Python code is executed line by line.

• C has direct access to hardware, while Python relies on external libraries for such access.
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Q4. Write a program to count vowels in your name
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A program to count vowels in a given name
• Create a function that takes a string as input

• Loop through each character in the string and check if it is a vowel (a, e, i, o, u)

• Increment a counter for each vowel found

• Return the total count of vowels
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Q1. Technical interview 2 Focuses on DSA
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Q2. Write quick sort
Ans. 
Quick sort is a divide-and-conquer algorithm that sorts an array by partitioning it into smaller sub-arrays.
• Choose a pivot element from the array

• Partition the array into two sub-arrays based on the pivot element

• Recursively apply quick sort to the sub-arrays

• Combine the sorted sub-arrays to get the final sorted array
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Q3. Implement Linked list
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Implement a linked list data structure in a programming language.
• Create a Node class with data and a reference to the next node

• Implement methods to add, remove, and search for elements in the linked list

• Handle edge cases like adding to an empty list or removing the last element
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Q4. All operations on Linked list
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Operations on Linked list include insertion, deletion, traversal, and searching.
• Insertion: Add a new node at the beginning, end, or middle of the linked list.

• Deletion: Remove a node from the linked list based on a given key or position.

• Traversal: Visit each node in the linked list to perform operations or display data.

• Searching: Find a specific node in the linked list based on a given key or value.
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Q5. Basic machine learning algorithms
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Q1. Basic fitment questions
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Q2. Introduction and flexibility
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2 DSA questions Both are from DP

Q1. 2 Questions , 1 is DSA
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Q2. Second question is Puzzle
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Q1. Pointless basic questions is what they asked
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Q1. They had this round for hours together
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Q1. Mimic Dataframe Merge
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Implement a function to mimic the functionality of merging two DataFrames in Python.
• Create a function that takes two DataFrames as input.

• Merge the two DataFrames based on a common column or index.

• Handle different types of joins like inner, outer, left, and right joins.

• Return the merged DataFrame as output.
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Q2. Improve above case by case
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1 hour - Find longest palindromic substring