Tata Consultancy Services (TCS) interview experience Real time questions & tips from candidates to crack your interview
System Engineer
Tata Consultancy Services (TCS)
2 rounds | 4 Coding
problems
Selected Interview preparation journey
Preparation
Duration: 2 months
Topics: Data Structures, Algorithms, Object Oriented Programming, Time Complexity, Programming Language Implementation
Tip 1 : Practice DSA questions, interview questions as much as you can.(400 leetcode questions) + (1000+ geeksforgeeks score) is good approximation of your preparation.
Tip 2 : You should have a good internship experience or 1 or 2 good projects on Android/web-d or Machine Learning.You should be through with your projects and be able to tell further improvements for the future.
Tip 3 : Be CONFIDENT with what you say. Don't murmur or speak in the mouth.The interviewer wants to know your thought process.
Application process
Where: Campus
Eligibility: Above 7 CGPA
Tip 1 : Resume is the first impression of you. So it must be very eye-catching. Write some decent (maybe 1 or 2 is enough) projects on your resume.
Tip 2 : You should be through with every point you have written on your resume. People usually write 10- 15 skills on their resumes while confident in only 5. Please don't do it.
Interview rounds
01
Round
Easy
Video Call
Duration45 minutes
Interview date9 Jul 2021
Coding problem2
1. Two Sum
Easy
10m average time
90% success
0/40
Asked in companies
You are given an array of integers 'ARR' of length 'N' and an integer Target. Your task is to return all pairs of elements such that they add up to Target.
Note:
We cannot use the element at a given index twice.
Follow Up:
Try to do this problem in O(N) time complexity.
Problem approach
You are given an array of integers 'ARR' of length 'N' and an integer Target. Your task is to return all pairs of elements such that they add up to Target.
2. Delete alternate nodes
Easy
20m average time
80% success
0/40
Asked in companies
Given a Singly Linked List of integers, delete all the alternate nodes in the list.
Example:
List: 10 -> 20 -> 30 -> 40 -> 50 -> 60 -> null
Alternate nodes will be: 20, 40, and 60.
Hence after deleting, the list will be:
Output: 10 -> 30 -> 50 -> null
Note :
The head of the list will remain the same. Don't need to print or return anything.
Problem approach
Given a Singly Linked List of integers, delete all the alternate nodes in the list.
02
Round
Easy
Video Call
Duration45 minutes
Interview date10 Jul 2021
Coding problem2
1. OOPS Questions
In which language do you code?
What are the four pillars of Object-oriented programming?
What is Null pointer exception in java?
What is serialisation and deserialisation in Java?
What is a constructor?
Can you use pointer to swap two numbers without using a third variable?
Problem approach
Four pillars of Object-oriented programming are Abstraction, Encapsulation, Inheritance, and Polymorphism.
Serialization in Java is a mechanism of writing the state of an object into a byte-stream. The reverse operation of serialization is called deserialization where byte-stream is converted into an object.
2. Technical Question
What is the contribution of the TATA group towards the betterment of our nation?
Problem approach
You have to do your research about the company so that interviewer will think that you are genuinely interested to join the company. I answered the question and told him about the charities which done by the TATA group and Ratan Tata (former chairman of Tata Sons).
Here's your problem of the day 
Solving this problem will increase your chance to get selected in this company
Skill covered: Programming
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