BOLD Technology Systems SQL Developer 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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Q1. General Core Steam Question
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Q2. What is Closer in PHP and why we use it during programming?
Ans. 
Closures are anonymous functions that can be assigned to a variable and used as a callback function.
• Closures are used to create functions that can be passed as arguments to other functions.

• They can access variables outside of their scope, making them useful for creating flexible and reusable code.

• Closures are often used in event handling, asynchronous programming, and functional programming.

• Example: $add = function($a,...read more
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Q1. What are your salary expectations?
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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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1 Hr coding round, Leetcode medium problems like Minimum Grid sum & Basic calculator

Q1. Machine oding asked to implement LLD
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Q2. What is a semaphore
Ans. 
A semaphore is a synchronization object used in concurrent programming to control access to shared resources.
• Semaphores can be used to limit the number of threads accessing a resource at the same time

• They can be implemented as counting semaphores or binary semaphores

• Example: In a producer-consumer problem, semaphores can be used to control access to a shared buffer
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