Carrefour SDE (Software Development Engineer) Interview Questions and Answers

Q1. Orages spoling question
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Q1. Prototypical Inheritance
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Q2. Why we can't use arrow function in constructor
Ans. 
Arrow functions do not have their own 'this' value, which is required in constructors.
• Arrow functions do not have a 'this' binding, so 'this' will refer to the parent scope.

• Constructors require 'this' to refer to the newly created object.

• Using arrow functions in constructors can lead to unexpected behavior and errors.
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Q3. Explain details about CORS
Ans. 
CORS stands for Cross-Origin Resource Sharing and is a security feature implemented in web browsers.
• CORS allows web servers to specify which origins are allowed to access their resources.

• It is used to prevent unauthorized access to resources on a different domain.

• CORS is implemented using HTTP headers such as Access-Control-Allow-Origin and Access-Control-Allow-Methods.

• It is important to properly configure CORS to avoi...read more
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Q4. Explain with an example about Lexical Scoping
Ans. 
Lexical scoping is a way of defining variable scope based on where they are declared in the code.
• Variables declared inside a function have local scope and are not accessible outside the function.

• Variables declared outside a function have global scope and can be accessed from anywhere in the code.

• Nested functions can access variables declared in their parent function.

• Example: function outer() { let x = 10; function inne...read more
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Q5. Advantages of arrow function
Ans. 
Arrow functions have concise syntax, implicit return, and lexical this binding.
• Shorter syntax than traditional function expressions

• Implicit return of a single expression

• Lexical this binding, avoiding the need for .bind() or self = this

• Example: const double = (num) => num * 2;

• Example: const names = ['Alice', 'Bob', 'Charlie']; const nameLengths = names.map(name => name.length);
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Round duration - 90 minutes
Round difficulty - Medium

This was a proctured online coding round where we had 2 questions to solve under 90 minutes . The questions were of easy to medium level I would say with some lenghty implementations .

Q1. 
Minimum Numbers Required Problem Statement
Given an array 'ARR' consisting of N integers, along with two integers, 'SUM' and 'MAXVAL', you need to determine the minimum number of integers to be added to t...read more
Ans. 
Determine the minimum number of integers to be added to an array to make its sum equal to a given value.
• Iterate through the array and calculate the current sum.

• Determine the difference between the target sum and the current sum.

• Add the minimum number of integers within the range of -MAXVAL to MAXVAL to reach the target sum.
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Q2. 
Maximum Sum Subsequence Problem Statement
Given an array of integers NUMS consisting of N integers and an integer K, determine the maximum sum of an increasing subsequence with exactly K elements.
Exampl...read more
Ans. 
Find the maximum sum of an increasing subsequence with exactly K elements in an array of integers.
• Iterate through the array and maintain a dynamic programming table to store the maximum sum of increasing subsequences ending at each index.

• For each element, check all previous elements to find the increasing subsequence with maximum sum ending at that element.

• Update the dynamic programming table with the maximum sum found...read more
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Round duration - 50 Minutes
Round difficulty - Medium

Standard Data Structures and Algorithms round . One has to be fairly comfortable in solving algorithmic problems to
pass this round with ease.

Q1. 
Check Whether Binary Tree Is Complete
You have been given a binary tree and your task is to determine if it is a Complete Binary Tree or not.
A Complete Binary Tree is defined as a binary tree where ever...read more
Ans. 
Check if a binary tree is a Complete Binary Tree or not based on given criteria.
• Traverse the binary tree level by level and check if all levels are completely filled except the last one.

• Ensure all nodes at the last level are positioned at the leftmost side.

• Use level order traversal to check for completeness of the binary tree.

• Example: For input 1 2 3 4 -1 5 6 -1 7 -1 -1 -1 -1 -1 -1, the output should be 1.
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Q2. 
Consecutive Elements
Given an array arr of N non-negative integers, determine whether the array consists of consecutive numbers. Return true if they do, and false otherwise.
Input:
The first line of inp...read more
Ans. 
Check if an array of integers consists of consecutive numbers.
• Iterate through the array and check if the absolute difference between consecutive elements is 1.

• Sort the array and check if the elements are consecutive.

• Use a set to store the elements and check if the size of the set is equal to the length of the array.
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Round duration - 40 Minutes
Round difficulty - Medium

This round majorly focused on my projects and some standard questions revolving around Operating Systems and DBMS.

Q1. How can you print numbers from 1 to 100 using more than two threads in an optimized approach?
Ans. 
Use multiple threads to print numbers from 1 to 100 in an optimized approach.
• Divide the range of numbers (1-100) among the threads to avoid duplication.

• Use synchronization mechanisms like mutex or semaphore to ensure proper order of printing.

• Consider using a shared data structure like a queue to coordinate the threads.

• Implement a mechanism to signal the threads when to start and stop printing.
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Q2. What are the advantages of using views in a database management system?
Ans. 
Views in a database management system provide data security, simplify complex queries, and improve performance.
• Enhanced security by restricting access to certain columns or rows

• Simplify complex queries by pre-defining joins and filters

• Reduce redundancy by storing commonly used queries as views

• Improve performance by storing pre-processed data in views

• Allow for data abstraction, making it easier to work with complex data...read more
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Round duration - 30 Minutes
Round difficulty - Easy

This is a cultural fitment testing round .HR was very frank and asked standard questions. Then we discussed about my role.

Q1. What do you know about the company?
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Q2. Why should we hire you?
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Q1. What is your wark full kra
Ans. 
My work full kra is to ensure efficient operations and customer satisfaction while meeting business goals.
• Ensure smooth functioning of daily operations

• Maintain high levels of customer satisfaction through effective communication and problem-solving

• Meet business goals by analyzing data and implementing strategies

• Train and develop team members to improve performance

• Collaborate with other departments to achieve overall co...read more
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Q2. What is your CTC and location
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Q3. What is your company name
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Q4. What is your expected CTC
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Q1. Why you wants to change your job
Ans. This is a great previlege for everyone to work with a good and reputated company like yours , also my keys skills are matching with your requirment position where i will give my best to contribute the company growth .
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About the work process (Operations )

About the Vehicle cost against Consignment, WHM ,