InstaSafe Interview Questions and Answers

Q1. Find a number in array which is greater than left and right element
Ans. 
Iterate through array and check if element is greater than its adjacent elements
• Iterate through array and check if current element is greater than element at index-1 and index+1

• Return the first element found that satisfies the condition

• Handle edge cases where element is at the beginning or end of array
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Q2. Find the number in the string and return the sum of numbers
Ans. 
Find and sum numbers in a string
• Iterate through each character in the string

• Check if the character is a digit

• If digit, convert to integer and add to sum
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Mintu Babu lives in a smaller house than her brother and in a larger house than her parents. Her children reside with her, and she has no other relatives. If Mintu Babu's relative U lives in a larger house than her relative S, then all the following may be true except: \n\n1) S is U's father \n\n2) S is U's mother \n\n3) U is younger than S \n\n4) S is younger than U

Q1. 1. merge two linked list
Ans. 
Merge two sorted linked lists without creating new nodes by rearranging existing nodes.
• Traverse both linked lists simultaneously

• Compare the values of nodes and rearrange pointers accordingly

• Continue until one of the lists is fully traversed
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Q2. 2. reverse a linked list.
Ans. 
Reverse a linked list by changing the direction of pointers.
• Start with three pointers: current, previous, and next.

• Iterate through the linked list, updating pointers to reverse the direction.

• Update the head of the linked list to be the previous node once iteration is complete.
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It included mcqs and multiple coding questions.

Q1. Yours technical skillls related questions
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Q2. Managerial questions
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Q1. Can we perform data driven testing using postman
Ans. 
Yes, Postman supports data driven testing through the use of variables and data files.
• Postman allows users to define variables and use them in requests for data driven testing.

• Data files such as CSV or JSON can be imported into Postman to drive test data.

• Iterations can be set up in Postman to run tests with different data sets.
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Q2. Basic coding questions on integer array missing numbers
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Q1. About yourself ?
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Q2. Just asked questions on previous role
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Q3. How many types of IOT devices are there
Ans. 
There are three main types of IoT devices: consumer, commercial, and industrial.
• Consumer IoT devices: Smart home devices like thermostats, lights, and security cameras.

• Commercial IoT devices: Smart meters, asset tracking systems, and connected vending machines.

• Industrial IoT devices: Sensors and actuators used in manufacturing, agriculture, and healthcare.
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Q1. Generate a Dataframe
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Analytical and Problem-Solving Skills:

I was asked to analyze hypothetical business scenarios and propose solutions, demonstrating my ability to identify key issues, prioritize tasks, and recommend strategic actions.


Data Interpretation and Reporting:

Questions focused on my experience with data interpretation, report generation, and using analytical tools like SQL or Excel to derive insights from complex datasets.


Stakeholder Management and Communication:

There were discussions about my previous experiences in stakeholder management and how I effectively communicated with diverse teams to gather requirements and deliver solutions.


Process Improvement and Innovation:

Interviewers were interested in my approach to process improvement and innovation within a business context, including examples of projects where I had successfully implemented changes to optimize workflows or enhance efficiency.

Assignment was to create an API for an expenses sharing application where users can input the total amount and the people to be shared the amount with and each individual amount in terms of either actual amount, percentage or split equally

Q1. Difference between process and threads
Ans. 
Processes are independent instances of a program, while threads are smaller units within a process sharing resources.
• Processes have their own memory space, while threads share the same memory space within a process.

• Processes are heavyweight, requiring more resources, while threads are lightweight.

• Processes communicate with each other through inter-process communication mechanisms, while threads can communicate directly...read more
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Q2. What is indexing in DBMS
Ans. 
Indexing in DBMS is a technique used to improve the performance of queries by allowing faster retrieval of data.
• Indexes are data structures that store a small portion of the table data in an optimized format for quick retrieval.

• They help in speeding up data retrieval operations like SELECT, UPDATE, DELETE queries.

• Examples of indexes include primary keys, unique keys, and composite keys.
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Q3. Examples and description of asymmetric encryption alogorithms
Ans. 
Asymmetric encryption algorithms use a pair of keys to encrypt and decrypt data, providing secure communication.
• RSA (Rivest-Shamir-Adleman) is a popular asymmetric encryption algorithm.

• Elliptic Curve Cryptography (ECC) is another commonly used asymmetric encryption algorithm.

• Asymmetric encryption is slower than symmetric encryption but provides better security.

• Public key is used for encryption and private key is used f
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Q4. Which sorting method is beneficial in which scenario
Ans. 
Different sorting methods are beneficial in different scenarios based on factors like time complexity, space complexity, and input size.
• Quick Sort: Best for large datasets due to its average time complexity of O(n log n)

• Bubble Sort: Simple and easy to implement, but inefficient for large datasets with its time complexity of O(n^2)

• Merge Sort: Stable and efficient for large datasets with its time complexity of O(n log n)

• ...read more
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Q1. What are ACID properties in DBMS
Ans. 
ACID properties are a set of properties that guarantee reliability and consistency in database transactions.
• Atomicity: Ensures that either all operations in a transaction are completed successfully or none at all.

• Consistency: Ensures that the database remains in a consistent state before and after the transaction.

• Isolation: Ensures that the execution of multiple transactions concurrently does not interfere with each ot...read more
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Q2. Underlying data structure in Indexing and its time complexity
Ans. 
Indexing typically uses data structures like B-trees or hash tables for efficient retrieval, with time complexity of O(log n) or O(1) respectively.
• Common data structures for indexing include B-trees and hash tables

• B-trees are typically used for indexing in databases due to their balanced nature and efficient search operations

• Hash tables are used for indexing in scenarios where constant time lookup is desired, but may h
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Q3. Time complexity of a recursive fibonacci code
Ans. 
Time complexity of recursive fibonacci code is O(2^n)
• The time complexity of a recursive fibonacci code is exponential, O(2^n)

• This is because each call branches into two recursive calls, leading to exponential growth

• For example, calculating fibonacci(5) would result in 15 function calls
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Q4. The protocol behind Web Sockets (because it was in my resume)
Ans. 
Web Sockets is a communication protocol that provides full-duplex communication channels over a single TCP connection.
• Web Sockets allow for real-time, bi-directional communication between a client and a server.

• They are commonly used in chat applications, online gaming, and live data streaming.

• Web Sockets use the ws:// or wss:// protocol scheme in URLs.

• The protocol is initiated with a handshake between the client and se...read more
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