CNES Interview Questions and Answers

Round duration - 90 minutes
Round difficulty - Medium

It was in the afternoon. I have to switch on my webcam during test. 1 person taking the test and 3 people were monitoring me. they ask many questions apart from the test as well. He give me some situations and ask me to give solution for the problem by writing algorithm and code.

Q1. 
Anagrams Problem Statement
You are given an array/list of strings called inputStr. Your task is to return the strings as groups of anagrams such that strings belonging to the same group are anagrams of ea...read more
Ans. 
Given an array of strings, group the strings that are anagrams of each other.
• Iterate through the array of strings and sort each string alphabetically to create a key for grouping.

• Use a hashmap to store the sorted string as key and the list of anagrams as value.

• Return the values of the hashmap as the grouped anagrams.
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Round duration - 90 minutes
Round difficulty - Medium

It was in the evening. I have to switch on my webcam during test. 1 person taking the test and 3 people were monitoring me. They asked many questions apart from the test as well.

Round duration - 30 minutes
Round difficulty - Medium

It was in the evening. There was total 3 persons in the meeting. They asked me many questions regarding my projects and my previous experience too. The interviewer were very friendly.

Round duration - 90 minutes
Round difficulty - Medium

It was in the morning. It was a one to one conversation. He asked me questions regarding my lifestyle, interests and work experience too. He asked me to tell me about myself for about 5 minutes. Then we talk a lot about current affairs too. Then we talked about package too. The interviewer was very nice and friendly in nature.

General maths, english

Q1. About yourself, willing to work night shift
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Q1. About yourself, are you willing to work shift basis
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Q1. General behaviour questions
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Q2. MS Excel Power point Presentation skills
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Basic Questions asked related to mathematics, GK, probability, statistics and English

Q1. Introduce yourself and
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Q2. Short and long term goal
Ans. 
Short term goal is to learn new skills and contribute to the company. Long term goal is to become a team leader.
• Short term goal: Learn new skills and contribute to the company

• Long term goal: Become a team leader

• Examples: Attend training sessions, take on new projects, collaborate with colleagues

• Examples: Develop leadership skills, mentor junior team members, lead projects
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Q1. Learn the basics on how to crack interview on situation based
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Q2. What is the difference between hard work and smart work
Ans. 
Hard work is putting in a lot of effort, while smart work is finding efficient ways to achieve the same results.
• Hard work involves putting in a lot of time and effort without necessarily considering the most efficient approach.

• Smart work focuses on finding efficient ways to accomplish tasks, often by leveraging resources, technology, or strategic thinking.

• Hard work may lead to burnout or inefficiency if not combined wi...read more
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Round duration - 90 Minutes
Round difficulty - Medium

Mainly mcqs and some coding questions

Q1. 
Nth Fibonacci Number Problem Statement
Calculate the Nth term in the Fibonacci sequence, where the sequence is defined as follows: F(n) = F(n-1) + F(n-2), with initial conditions F(1) = F(2) = 1.
Input:
...read more
Ans. 
Calculate the Nth Fibonacci number efficiently using dynamic programming.
• Use dynamic programming to store previously calculated Fibonacci numbers to avoid redundant calculations.

• Start with base cases F(1) and F(2) as 1, then iterate to calculate subsequent Fibonacci numbers.

• Optimize the solution to have a time complexity of O(N) by storing and reusing calculated values.
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Round duration - 60 Minutes
Round difficulty - Easy

Introduction and some Python Questions

Q1. 
String Palindrome Verification
Given a string, your task is to determine if it is a palindrome considering only alphanumeric characters.
Input:
The input is a single string without any leading or trailing...read more
Ans. 
Check if a given string is a palindrome considering only alphanumeric characters.
• Remove non-alphanumeric characters from the input string before checking for palindrome.

• Use two pointers approach to compare characters from start and end of the string.

• Convert all characters to lowercase for case-insensitive comparison.

• Return true if the string is a palindrome, false otherwise.
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Round duration - 60 Minutes
Round difficulty - Easy

Questions related to cloud deployments and all

Q1. Can you explain your approach to project scaling in AWS?
Ans. 
My approach to project scaling in AWS involves utilizing auto-scaling groups, load balancers, and monitoring tools.
• Utilize auto-scaling groups to automatically adjust the number of EC2 instances based on traffic patterns

• Implement load balancers to distribute incoming traffic evenly across multiple instances

• Use monitoring tools like CloudWatch to track performance metrics and make informed scaling decisions
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Round duration - 45 Minutes
Round difficulty - Easy

Mainly discussed the future goals and expectations from the company

Q1. Can you discuss your work experience, the company culture you've encountered, and your future expectations regarding growth opportunities?
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Q1. Bits , bytes and xor.
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Q1. Threads, mutex and IPC
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Q1. Tell about company and yourself. More if behavioural round.
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Q1. String Manipulation program
Ans. 
Create a program for string manipulation using an array of strings.
• Use built-in string manipulation functions like substring, replace, and concat.

• Iterate through the array of strings to perform different manipulations.

• Consider edge cases like empty strings or null values.

• Example: Reverse each string in the array and concatenate them together.
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Q2. Internal Working of HashMap
Ans. 
HashMap is a data structure that stores key-value pairs and uses hashing to efficiently retrieve values.
• HashMap internally uses an array of linked lists to store key-value pairs.

• When a key-value pair is added, the key is hashed to determine the index in the array where it will be stored.

• If multiple keys hash to the same index, a linked list is used to handle collisions.

• To retrieve a value, the key is hashed again to fi...read more
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Q3. Spring Annotations
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Q1. Coding question
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Q2. Maven working in Depth
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Q3. SQL, Oracle/MySql
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