DHL IT Services Test Engineer Interview Questions and Answers

Round duration - 40 minutes
Round difficulty - Medium

Asked about time complexity of algorithm, puzzles, DBMS, cutting edge technologies etc. What are indexes?

Q1. 
Flip Bits Problem Explanation
Given an array of integers ARR of size N, consisting of 0s and 1s, you need to select a sub-array and flip its bits. Your task is to return the maximum count of 1s that can b...read more
Ans. 
Given an array of 0s and 1s, find the maximum count of 1s by flipping a sub-array at most once.
• Iterate through the array and keep track of the maximum count of 1s obtained by flipping a sub-array.

• Consider flipping a sub-array from index i to j and calculate the count of 1s in the resulting array.

• Return the maximum count of 1s obtained by flipping a sub-array at most once.
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Round duration - 20 minutes
Round difficulty - Medium

Asked 1 standard algorithm

Q1. 
Number of Islands Problem Statement
You are provided with a 2-dimensional matrix having N rows and M columns, containing only 1s (land) and 0s (water). Your goal is to determine the number of islands in t...read more
Ans. 
Count the number of islands in a 2D matrix of 1s and 0s.
• Iterate through the matrix and perform depth-first search (DFS) to find connected 1s.

• Mark visited cells to avoid redundant traversal.

• Increment island count whenever a new island is encountered.
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Good and overall happy with assignment coding and testing thing

Q1. What is PHP OOPs features
Ans. 
PHP OOPs features include encapsulation, inheritance, polymorphism, and abstraction.
• Encapsulation allows data hiding and protects data from being modified by external code.

• Inheritance enables a class to inherit properties and methods from a parent class.

• Polymorphism allows objects to take on multiple forms and behave differently based on the context.

• Abstraction allows the creation of abstract classes and methods that c
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Q2. What is SOlid principles
Ans. 
SOLID principles are a set of five design principles that help in creating maintainable and scalable software applications.
• S - Single Responsibility Principle (SRP)

• O - Open-Closed Principle (OCP)

• L - Liskov Substitution Principle (LSP)

• I - Interface Segregation Principle (ISP)

• D - Dependency Inversion Principle (DIP)
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Q1. DP medium question C# Internals LLM technical writing
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Duration: 1hr45min
DSA medium level question

Python Code - Data Structures, Dynamic Programming

Q1. Optmise performance in pytho?
Ans. 
Optimize Python performance by using efficient data structures, algorithms, and built-in functions.
• Use list comprehensions instead of loops for faster execution. Example: [x**2 for x in range(10)]

• Utilize built-in functions like map(), filter(), and reduce() for better performance.

• Choose the right data structures: use sets for membership tests instead of lists.

• Profile your code using cProfile to identify bottlenecks.

• Con...read more
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Q2. Give example of decorator in python.
Ans. 
A decorator in Python is a function that modifies the behavior of another function or method.
• Decorators are defined using the '@' symbol followed by the decorator function name.

• They can be used to add functionality to existing functions without modifying their code.

• Example: A simple logging decorator that prints the function name before execution.

• Example code: def my_decorator(func): def wrapper(): print(...read more
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Coding test on the Turing platform

Q1. Have u worked in a remote environment before?
Ans. 
Yes, I have worked in a remote environment before.
• I have experience working remotely as a software engineer.

• I am comfortable with remote collaboration tools and communication channels.

• I have successfully completed projects while working remotely.

• I am self-motivated and able to manage my time effectively in a remote setting.
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