ACKO Software Developer Intern Interview Questions, Process, and Tips

4 coding problems + 1 sql problem

• Q1. Gas Station Problem On leetcode
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• Q2. Simple Tree Traversal Problem LC medium
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Round duration - 90 minutes
Round difficulty - Easy

The online round had 2 coding questions and one question of a regular expression.

• Q1. Two Sum 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 the...read more
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• Q2. Increasing Subsegment Gary has a sequence 'ARR', consisting of 'N' integers. We'll call a sequence ARR[i], ARR[i+1], ..., ARR[j] where 1 ≤ i...read more
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• Q3. Regular Expression Regular Expression question: Write a regular expression that returns true if the first character of the string is the same as the last charac...read more
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Round duration - 60 minutes
Round difficulty - Easy

First 10 minutes started with the Introduction. Then he asked about my projects. He seemed interested in my projects and asked a lot of questions about them. He asked questions related to Node Js, React Js, Mongo DB, AWS as all these were mentioned in my Resume. Around 25 minutes was completed explaining each and everything.

Then he started with the coding questions. I was allowed to share my screen and use any of my favourite text editors. I chose ‘VS Code’.

I was able to solve 2 coding questions very easily. I got stuck in the puzzle as I didn’t solve any puzzles before. I was able to come up with different approaches, but they weren’t the most optimal. He tried giving me a lot of hints but still wasn’t able to solve it. I had a positive can-do attitude throughout, and I was really close to solving it.

Feedback: He told me I performed well and asked if I had any questions for him. I asked for the solution to the puzzle. He explained to me the solution and I told him that I will practice puzzles.

Around 5-6 students got selected for 2nd Interview.

• Q1. Move Zeros To Left You are given an array 'ARR' of integers. Your task is to modify the array so that all the array elements having zero values get pus...read more
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• Q2. Maximum sum of pairs with specific difference You are given an array of integers and a number ‘K’. You can pair two elements in the array 'ARR' if the a...read more
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• Q3. Puzzle There are 25 horses among which you need to find out the fastest 3 horses. You can conduct race among at most 5 to find out their relative speed. At no p...read more
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Round duration - 35 minutes
Round difficulty - Medium

It started with a brief Introduction and in-depth discussions on projects. He also asked me a lot of questions about my previous internship. He asked me some behavioural questions as well.

I was able to solve the question, and he did not ask me any other questions. This round was really short for me and was finished in around 35 minutes, well before time. I asked about my feedback, and he told me that the ‘HR’ will get back to me. I thought he was not satisfied with my answers and I will be rejected though I gave very good answers to every question.

3 students got selected for the next round. I think he was satisfied and did not want to waste more time asking questions.

• Q1. Evaluate the Polynomial You are given two arrays of coefficients and degrees of a polynomial expression. You need to simplify the polynomial in general form by ...read more
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Round duration - 60 minutes
Round difficulty - Medium

It started with an introduction and discussion on projects. He seemed very curious about my project and went ahead to cross-question every functionality. We discussed everything and how the code works. He asked me a lot of questions on ‘Socket’ as my project mentioned it.

HR-related questions such as:
Why do you want to join the company?
Where do you see yourself in the next 5 years?
What are your strengths and weakness?

• Q1. Scoping and Hoisting.
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• Q2. Explain in brief about async-await
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• Q3. Scenario-based networking question: Suppose you are working on ‘WhatsApp’, sometimes the message gets lost. Explain how would you detect this and check this in ...read more
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Round duration - 50 minutes
Round difficulty - Easy

• Q1. Move Zeros To Left You are given an array 'ARR' of integers. Your task is to modify the array so that all the array elements having zero values get push...read more
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• Q2. Operating System

  Difference between Process and Thread.
  What is multithreading?

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• Q3. Rat in a Maze problem You are given a 'N' * 'N' maze with a rat placed at 'MAZE[0][0]'. Find and print all paths that rat can follow to ...read more
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Round duration - 60 minutes
Round difficulty - Medium

First 10 minutes started with the Introduction. Then he asked about my projects. He seemed interested in my projects and asked a lot of questions about them.

• Q1. Matrix Chain Multiplication. Given a chain of matrices A1, A2, A3,.....An. Your task is to find out the minimum cost to multiply these matrices. The cost of mat...read more
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• Q2. System Design

  Design Instagram

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• Q3. DBMS

  Basic questions like ACID properties.
  Difference between mysql and sql etc

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Round duration - 20 minutes
Round difficulty - Easy

• Q1. General Questions

  Why do you want to join the company?
  Where do you see yourself in the next 5 years?
  What are your strengths and weakness?

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Round duration - 30 minutes
Round difficulty - Easy

• Q1. Delete a Node from Linked List You have been given a linked list of integers. Your task is to write a function that deletes a node from a given position, 'P...read more
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Round duration - 120 minutes
Round difficulty - Easy

• Q1. Diameter Of Binary Tree You are given a Binary Tree. You are supposed to return the length of the diameter of the tree. The diameter of a binary tree is the len...read more
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