Publicis Sapient Reactjs Developer Interview Questions and Answers

Its a 90 minutes aptitude round. It's having 3 sections :
1 - Logical and Anlytical reasoning
2 - Related to your Skills and the position for which you have applied. For me it was completly on React.
3 - Code Ground, where you have to showcase your coding skills.

Q1. There were programming questions and chose the correct output kind of questions.
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It was easy, basic cpp

Q1. Tell me you introduction
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Q2. Why you want to join
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Round duration - 90 minutes
Round difficulty - Medium

2 Programing Questions and 30 MCQs. 
Programing questions were medium with one being array manipulation and other being graph based. 

MCQ were from OOPs concepts, SQL, Operating System and Network, prepare in depth knowledge for all the topics.

Q1. 
Count Pairs Problem Statement
You are given an array A of length N consisting only of integers. Additionally, you are provided with three integers X, Y and SUM. Your task is to count the number of pairs (...read more
Ans. 
Using HashMap or self balancing BST for fastest result.
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Q2. 
Longest Substring Without Repeating Characters Problem Statement
Given a string S of length L, determine the length of the longest substring that contains no repeating characters.
Example:
Input:
"abac...read more
Ans. Brute Force
In the brute force approach, we will use two nested loops. The outer loop is used to select the starting index of the substring and the inner loop is used to fix the ending index of the substring. After selecting the substring, we will use another loop (or a method) to check whether the substring contains all unique characters or not using a HashSet.
Space Complexity: O(n)Explanation:
O(L), where L is the len...read more
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Round duration - 90 minutes
Round difficulty - Medium

Questions on SQL and DBMS were asked in this round

Q1. What are the ACID properties in DBMS?
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Q2. Can you explain the different levels of data abstraction in a DBMS?
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Q3. What are constraints in SQL?
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Round duration - 30 minutes
Round difficulty - Medium

HR round was pretty much a casual conversation about why optum, work location, joining availablity and what qualities you would like to highlight about yourself.

Q1. Why do you want to work at Optum, and what qualities would you like to highlight?
Ans. 
Tip 1 : Go through wiki page or google about the working of the company
Tip 2 : Qualities should more aligned to the company's values.
Tip 3 : Show your interest in working with the organisation and how will you contribute to the team.
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Round duration - 90 minutes
Round difficulty - Medium

Timing -12pm to 1:30pm
Test environment was good and we should keep in our mind about our net speed.

Q1. 
Reverse Array Elements
Given an array containing 'N' elements, the task is to reverse the order of all array elements and display the reversed array.
Explanation:
The elements of the given array need to...read more
Ans. Brute Force approach
• Initialise start and end indices with start = 0, end = N-1 where N is the total number of elements in array.
• We then run a loop while start < end and swap arr[start] with arr[end].
• Finally, we increment start and decrement end variable
Space Complexity: O(1)Explanation: Time Complexity: O(1)Explanation:
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Q2. 
Tiling Problem Statement
Given a board with 2 rows and N columns, and an infinite supply of 2x1 tiles, determine the number of distinct ways to completely cover the board using these tiles.
You can place...read more
Ans. Recursion And Memoization (Runtime error)
Try to place the tile to fill the unit column and calculate the number of ways from smaller sub-problems. Then use memoization to convert O(2^N) solution to an O(N) solution.
1. At any point we are at ‘idx’ column then we can place our tile in two ways to fill this column.
   1. Option 1 -  1 Horizontal Tile
We can place in this way where we have ‘idx-1’ column filled.
    &nb...read more
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Round duration - 60 Minutes
Round difficulty - Easy

Timing was 3pm to 4 pm
environment was easy familier and interviwer was also in good mood ,first he ask me about general things then he come on OS/DBMS .

Round duration - 30 Minutes
Round difficulty - Easy

timing - 10am to 10:30am
environment was very familier and interviewer was with good sence of humor