Infosys interview experience Real time questions & tips from candidates to crack your interview
System Engineer Specialist
Infosys
3 rounds | 3 Coding
problems
Selected Interview preparation journey
Journey
I was an average student in my school life and I was unaware of all the coding stuff, even when I was in 11th class I chose physical education instead of computer science. I got to know about the coding stuff from my friends in the first year of college. I took coding classes from Youtube where I learnt about the basics of coding and DSA, meanwhile I also learned Machine Learning in the last phase of third year.
Application story
I got to know about this opening through a LinkedIn post. I applied for the post and practiced for it. Soon after all this I got a link for a test on my Gmail and after that various rounds took place.
Why selected/rejected for the role?
I was confident during the full interview process. Actually, I worked a lot on my communications skills and I think they were the main reasons for me getting par the selection process.
Preparation
Duration: 2 months
Topics: C, C++, DBMS, OOPS, Data Structure and Algorithm
Tip 1 : Go through your resume properly and mention only those points in which you are comfortable to answer.
Tip 2 : Prepare interview question on any one programming language properly
Tip 3 : Be prepared with any one of your project ( if done )
Application process
Where: Other
Eligibility: Should be in BTECH final year
Tip 1 : Have at least one project or experience in your resume.
Tip 2 : Do not put false things on your resume.
Interview rounds
01
Round
Easy
Online Coding Interview
Duration180 minutes
Interview date30 Mar 2020
Coding problem1
Timing :- They conducted test in day time on weekends.
Problems :- Round consist of 3 coding problems.
Environment :- Test was web proctored.
Other :- Only 1 problem is needed to clear this round.
1. Prime time again
Moderate
25m average time
60% success
0/80
Asked in companies
You have been given two integers ‘DAY_HOURS’ and ‘PARTS’. Where ‘DAY_HOURS’ is the number of hours in a day and a day can be divided into ‘PARTS’ equal parts. Your task is to find total instances of equivalent prime groups. Prime group refers to the group of elements (hours) which are prime and measure the same equivalent time since the start of the day.
For example, if we consider ‘DAY_HOURS’ to be 24 and ‘PARTS’ to be 2, then the day of total 24 hours is divided into 2 parts ( 1 - 12 ) and ( 13 - 24 ). 5 hours in the first part of the day is equivalent to 17, which is 5 hours into the second part of the day. And since 5 and 17 both are prime, they can be considered as a prime group.
Note:
1. Day starts with hour 1 and ends with hour ‘DAY_HOURS’.
2. Each hour of the prime group should be in a different part of the day.
3. If there is no prime group then return zero.
4. ‘DAY_HOURS’ should be divisible by ‘PARTS’, meaning that the number of hours per part (DAY_HOURS/PARTS) should be a natural number.
Example:
Let ‘DAY_HOURS’ = 20 and ‘PARTS’ = 2
Hence the view of our day would be in the following format:
1 2 3 4 5 6 7 8 9 10 - Part 1
11 12 13 14 15 16 17 18 19 20 - Part 2
1-11 Not a prime group because 1 is not prime.
2-12 Not a prime group because 12 is not prime.
3-13 Because both 3 and 13 are prime, it is an equivalent prime group.
4-14 Not a prime group because 4 and 14 are not prime.
5-15 Not a prime group because 15 is not prime.
6-16 Not a prime group, because 6 and 16 are not prime.
7-17 Because both 7 and 17 are prime, it is an equivalent prime group.
8-18 Not a prime group, because 8 and 18 are, is not prime.
9-19 Not a prime group because 9 is not prime.
10-20 Not a prime group because both 10 and 20 are not prime.
Hence there are 2 equivalent prime groups in the above format which are 3-13 and 7-17.
02
Round
Medium
Online Coding Interview
Duration180 minutes
Interview date31 May 2020
Coding problem1
Timing :- 10 a.m. - 1 p.m. ( 3 hours )
Problems :- 3 coding problems were in this round ( Easy, Medium, Hard ) basis. You can not check the submission results in this round. So, can't be sure whether solution you submitted is correct or not. PPI oppurtunity for roles in infosys (SE, SES, Power Programmer) were based on this round.
1. Rotting Oranges
Moderate
20m average time
78% success
0/80
Asked in companies
You have been given a grid containing some oranges. Each cell of this grid has one of the three integers values:
Every second, any fresh orange that is adjacent(4-directionally) to a rotten orange becomes rotten.
Your task is to find out the minimum time after which no cell has a fresh orange. If it's impossible to rot all the fresh oranges then print -1.
Note:
1. The grid has 0-based indexing.
2. A rotten orange can affect the adjacent oranges 4 directionally i.e. Up, Down, Left, Right.
03
Round
Medium
Face to Face
Duration50 minutes
Interview date12 Oct 2020
Coding problem1
After getting the PPI offer from Infosys and waiting for long 2 months. On 12th October my interview was scheduled, it was a 1 hour interview 12 noon - 1 p.m. Interview was conducted on Infosys Meridian ( Infosys Own Platform ). A meeting id was provided in mail, and we can not join before interviewer. HR contact number was provided in mail.
Interview begin :-
Interviewer :- Good afternoon, So tell me something about your family forget about your acdemics now. ( He was trying to make me comfortable ).
Me :- Told about my family, what they are doing and something about myself.
Interviewer :- You are from electrical, then why you preferred coding instead of going Navratna Electrical companies ( Bhel, NTPC)
Me :- I started coding from 2nd year and i found myself more interested in this. So, i just followed my passion.
Interviewer :- In which programming language are you comfortable ?
Me :- C++
Interviewer :- Why?
Me :- Because its faster than Java and Python and easy to implement. And i take part in competitive programming contest on Codechef, Codeforces so, C++ consists of Standard Template Library which is beneficial.
Interviewer:- What is this pointer?
Me:- This pointer represents to the current object in a class.
Then he asked few more question on C++ ( difference between call be value and call be reference, namespace, some C++ libraries)
Interviewer:- In which CSE topics are you comfortable?
Me:- DS and Algo, OOPS
Interviewer:- Can you write some queries?
Me:- I practised one day before few SQL queries but i was not confident. So, dont want to give a try I answered "No sir".
Interviewer:- What is flux?
Me:- Magnetic flux passing through a unit area.
Then he start asking few more question form electrical core. I was not able to answer. I said him I am not good in electrical core. I am more interested to solve any DS/Algo question.
Interviewer:- Make a doubly linked list of 5 elements and apply merge sort on it. He asked me to share the screen and open any of my favourite online editor.
Me:- I coded on Codechef-IDE. First dicuss the logic with him and then coded witn explaining him each line. Th code run successfully and Interviwer seems to satisfy.
Then, he pasted a piece of code in Python in a doc sheet and send me. He asked me to solve that problem. It was based on concepts of OOPS. Consisting of 3 classes and relation of Inheritance, Copy constructor, Parameterised Constructor was there in that problem. I step by step solve that problem and gave final output to interviewer. Interviewer was satisfied with output and said it was correct.
Interviewer:- I am done with interviewer. I check your coding knowledge. Do you have any questions for me?
Me:- Asked about training process in infosys.
Verdict:- Selected
1. MergeSort Linked List
Moderate
30m average time
60% success
0/80
Asked in companies
For a given Singly Linked List of integers, sort the list using the 'Merge Sort' algorithm.
Here's your problem of the day 
Solving this problem will increase your chance to get selected in this company
Skill covered: Programming
How do you write a single-line comment in C++?
Choose another skill to practice
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