24/7 Customer Software Developer Intern Interview Questions and Answers

2 coding question were there and we need to solve eit in 45 minutes

• Q1. Asked a DSA questions
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• Q2. Some random question about project.
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OnCampus Test including DSA Questions

• Q1. Introduce yourself
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• Q2. DSA Question based on Dynamic Programming
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Round duration - 60 minutes
Round difficulty - Medium

Round 1  was a coding round of 60 min which started around 5:30PM in which 2 problem statements were given. The questions were based on Array and linked list. The platform used for test was coding which was user friendly and which use to display number of test cases passed and some test cases were hidden.

• Q1. Deletion in Circular Linked List You are given a Circular Linked List of integers, and an integer, 'key'. You have to write a function that finds the gi...read more
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• Q2. Move All Negative Numbers To Beginning And Positive To End You are given an array 'ARR' consisting of 'N' integers. You need to rearrange the ar...read more
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Round duration - 30-35 minutes
Round difficulty - Medium

This round was of technical interview and they asked me various concepts

• Q1. Basic Interview Questions They given me 2 table containing names of different cities and told me to apply left join on them. 1) Asked me about the Languages kno...read more
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Round duration - 90 Minutes
Round difficulty - Easy

It was a telephonic round. The interview asked me these questions.
 

• Q1. Puzzle You have two ropes coated in oil to help them burn. Each rope will take exactly 1 hour to burn all the way through. However, the ropes do not burn at con...read more
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• Q2. Technical Questions

  1. Dynamic memory allocation for 2d array
  2. How polymorphism works in C++(Vptr and Vtable implementation)
   

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Round duration - 60 Minutes
Round difficulty - Medium

The interviewer started asking me questions. He gave me 2 problems. He was giving hints in case of any issues.
 

• Q1. Maximum Frequency Number Ninja is given an array of integers that contain numbers in random order. He needs to write a program to find and return the number whi...read more
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• Q2. System Design Question There is an online catalog of songs (Like Saavn or Gaana). How you will show favorite songs every day to users. An efficient algorithm re...read more
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Round duration - 60 Minutes
Round difficulty - Medium

This was a technical interview. He gave me these questions one by one.
1. Again, how polymorphism works. Draw vtable and vptr
2. Producer consumer problem with synchronization
3. Difference between mutex, semaphore, and condition_variable.
4. Design parking lot system
5. Zigzag traversal of binary tree

• Q1. System Design Question

  Design parking lot system

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• Q2. Zigzag Binary Tree Traversal Given a binary tree, return the zigzag level order traversal of the nodes' values of the given tree. Zigzag traversal means sta...read more
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Round duration - 90 minutes
Round difficulty - Medium

1. He asked about the producer-consumer problem but I told him that the same question is asked in the previous round.
Then interviewer went asking lots of questions related to producer and consumer. Lots of discussions like what is a writer is not there and the only reader is there and you need to find out how many readers are currently reading from the buffer.
2. Discussions about C++11 features. How thread and async is different
3. Design your own shared_ptr(How you will handle ownership)
4. Check If the binary tree is symmetrical.
5. Find elements in a rotated sorted array and then optimize it.

• Q1. Tree Symmetricity You are given a binary tree, where the data present in each node is an integer. You have to find whether the given tree is symmetric or not. S...read more
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• Q2. Search In Rotated Sorted Array You have been given a sorted array/list ARR consisting of ‘N’ elements. You are also given an integer ‘K’. Now the array is rotat...read more
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Round duration - 90 minutes
Round difficulty - Easy

This round was scheduled for 9am in the morning. The test environment was pretty good . I didn't face any issues on the HireVeu platform. The first test was of Aptitude and then in next section it was Technical MCQ's. The level of questions were mid to high level of difficulty.

• Q1. DBMS Questions What is DML and DDL? Write an SQL query to print the FIRST_NAME from Worker table after replacing ‘a’ with ‘A’. Write an SQL query to print detai...read more
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Round duration - 60 minutes
Round difficulty - Medium

The exam was on the same Platform. The first question was about the most difficult Project I've worked on. I have to record a video in that particular platform and then move to the next questions. There was option for a demo video of 1 minute in which you can practice your answers and then can record your answer in the next video of max 5 minutes. The next 2 question were Coding Problems of moderate difficulty and you've to record your approach and then proceed towards solving the code and then record a video stating if you succeed or not and what better could you've done to make it work.

• Q1. Sum Of N Digit Palindromes You are given an integer 'N'. Your task is to return the sum of all N-digit numbers which are palindrome. A number is said to...read more
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Round duration - 45 minutes
Round difficulty - Medium

This round was scheduled for 3pm. The interviewer was quite friendly. He asked about me and told me to relax and then answer. He started with asking questions from my Project and how the ideas behind the Project. My Project was related to Deadlock So he asked whether I can implement my Project on any environment. I answered . Then one of my internship Project was related to Web development so He asked me about the backend of the Project. He gave me a few SQL queries and some general DBMS concepts based on the response about using Mysql in the Project. He asked me a few things about AWS and Cloud Computing which I answered. At last he asked some LINUX commands and corrected me once and was satisfied with my answers.

• Q1. OS Questions 1) What is Kernel? 2) What is Deadlock? 3) Why you use Binary semaphores instead of Counting Semaphores? 4) What is threads? What is hardware threa...read more
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• Q2. DBMS & Trees Questions

  1) Explain DDL VS DML.
  2) Explain Normalization
  3) B+ Trees and it's working.

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Round duration - 25 minutes
Round difficulty - Medium

The interview was scheduled at 2pm and it began exactly at the same time. The interview was pretty good and the interviewer was very calm and humble. He asked me many questions based on my project and I was able to answer all of them. One incident that I wants to tell you is that the interviewer asked me a question in which I was stucked I tried my best to answer that question but I was not able to answer it then the interviewer asked me to take a deep breath and then try to give the answer and guess what happened, I was able to answer that question.

• Q1. How do you enable Pagination using CSS3?
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• Q2. HTML

  Which of the HTML5 elements support media content?

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• Q3. Operating System

  How can you reduce page loading time?

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