Practo Software Developer Intern Interview Questions and Answers

Was asked to build a REST API for inventory management of a store using Django REST framework.

Q1. Had a discussion regarding my project and resume with the founder, he paid attention to detail and was polite and supportive.
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Round duration - 24 hours
Round difficulty - Medium

Round duration - 120 Minutes
Round difficulty - Medium

It was a Data Structures and Algorithm Round and Discussion on My assignment round to check my Problem Solving Skills.
And the Interviewer was very friendly to me. I first introduced myself to the interviewer and what did I have done in past as a Software Engineer and Why I want to work in Grofers.
 

Q1. 
Top View of Binary Tree
Given a binary tree of integers, the task is to return the top view of the given binary tree. The top view of the binary tree is the set of nodes visible when viewed from the top.
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Ans. Using Pre-Order Traversal
As we know that all three traversals, i.e. pre-order, in-order and post-order, visit the tree node at once. We can use any of them. Here we are going to use pre-order traversal for the explanation. So while traversing in the pre-order traversal, we will keep track of horizontal distance of the node which is going to be visited from the root node, and we also keep track of the vertical level of ...read more
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Q2. 
Maximum Possible Time Problem Statement
Given an array ARR consisting of exactly four integer digits, your task is to form the maximum possible valid time in a 24-hour format using those digits.
Explanat...read more
Ans. Maximum Possible Time
Approach:
• The basic idea is that we will iterate over all the permutations of the 4 digits and check whether we are able to form a valid 24 Hr format time. If so we will then also find the maximum possible time.
• Here we will use the ‘NEXT_PERMUTATION’ method to find all the permutations.
 
Algorithm:
• There are two conditions for valid 24 Hr format time:
  • The first two digits i.e the hour should be le...read more
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Q1. Insert node in BST
Ans. 
Insert a node in a Binary Search Tree (BST)
• Start at the root node and compare the value of the node to be inserted with the current node

• If the value is less than the current node, move to the left child. If greater, move to the right child

• Repeat the process until reaching a leaf node, then insert the new node as a left or right child
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Q2. Design Lift system
Ans. 
Design a lift system for efficient vertical transportation
• Consider the number of floors in the building

• Include safety features like emergency stop button

• Optimize for speed and energy efficiency

• Implement a user-friendly interface for passengers
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Q1. Create APIs for a Quiz platform
Ans. 
Create APIs for a Quiz platform
• Design RESTful APIs for creating, updating, deleting, and retrieving quizzes

• Include endpoints for managing quiz questions, answers, and user responses

• Implement authentication and authorization mechanisms for secure access

• Utilize JSON format for data exchange between client and server
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Medium level array question was asked on hackerrank.

Q1. Simple string question was asked which required a little thinking and simple implementation.
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Q1. This was a coding round. I was given a screenshot which has dropdowns in it and I had to make the UI of it using react.js
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