NielsenIQ Software Engineer Interview Questions, Process, and Tips

Apti round had English and aptitude related easy questions.

Mostly easy or medium level question, 2 problems.

Q1. Java, Oops, dbms, 1 puzzle and 2 dsa questions
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Q1. Explain OOPS concept
Ans. 
OOPS (Object-Oriented Programming) is a programming paradigm based on the concept of objects, which can contain data and code.
• OOPS focuses on creating objects that interact with each other to solve a problem

• It involves concepts like classes, objects, inheritance, polymorphism, and encapsulation

• Example: Inheritance allows a class to inherit properties and behavior from another class
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Q2. Boxing,umboxing / ref,out / async programming
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Q3. [1,1,2,3,4,5,5] remove duplicate from given list
Ans. 
Remove duplicates from a given list of numbers
• Create a new list to store unique elements

• Iterate through the given list and add elements to the new list if they are not already present

• Return the new list as the result
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Q1. Sorting algorithm
Ans. 
Sorting algorithms arrange data in a specified order, commonly ascending or descending.
• Types of sorting algorithms: Quick Sort, Merge Sort, Bubble Sort.

• Quick Sort: Efficient, uses divide-and-conquer, average time complexity O(n log n).

• Merge Sort: Stable, divides array into halves, time complexity O(n log n).

• Bubble Sort: Simple, repeatedly swaps adjacent elements, time complexity O(n^2).

• Example: Sorting [5, 2, 9, 1] usi
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Q2. Reverse Linked list
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Q1. Coding questions
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Q2. Architecture questions
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Mostly two questions will be given to you. Both having Data structures based. The logic is more important rather than the implementation.

Questions related to what will you do incase bug arises in existing code.

Q1. This round will be with the Director level associate. May ask some basic questions about Data Structure.
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Da and algo on array, string and list

Q1. Basic ds and algon in java
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Q2. Duplicate in array
Ans. 
Find duplicates in an array of strings.
• Iterate through the array and use a hash set to keep track of seen elements.

• If an element is already in the hash set, it is a duplicate.

• Example: ['apple', 'banana', 'apple', 'orange'] should return 'apple' as a duplicate.
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Q3. Reverse of sentence
Ans. 
The reverse of a sentence is the words in the sentence in reverse order.
• Split the sentence into words

• Reverse the order of the words

• Join the words back together
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