Fourkites Senior Software Engineer 2 Interview Questions and Answers

Basic DSA questions, best time to buy and sell stock and its variation

Q1. Basic nosql vs sql questions
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Q2. Designing system for google playstore
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Basic OOP questions for python programming language

Q1. What's abstraction
Ans. 
Abstraction is the concept of hiding complex implementation details and showing only the necessary information to the user.
• Abstraction allows users to focus on what an object does instead of how it does it

• It helps in reducing complexity and improving efficiency in software development

• Example: In object-oriented programming, abstract classes and interfaces are used to achieve abstraction
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Q2. What's the difference between SQL and NoSQL database
Ans. 
SQL databases are relational databases with structured data, while NoSQL databases are non-relational databases with flexible, unstructured data.
• SQL databases use structured query language for defining and manipulating data, while NoSQL databases use different query languages or APIs.

• SQL databases are table-based, with a predefined schema, while NoSQL databases are document, key-value, wide-column, or graph-based.

• SQL d...read more
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Q1. Reverse a linked list
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Reverse a linked list by changing the direction of pointers
• Start with three pointers: current, prev, and next

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

• Update the head of the linked list to the last node after reversing
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Q2. Implement binary search algorithm
Ans. 
Binary search algorithm efficiently finds the target value in a sorted array.
• Start by defining the low and high indices of the array.

• Calculate the mid index and compare the target value with the value at mid.

• If target is less than mid value, update high to mid-1; if greater, update low to mid+1.

• Repeat until target is found or low is greater than high.
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Q1. Brief Introduction and basic questions
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Q2. Future plans and how am i going to achieve them
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Q1. They asked to design a database table
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Medium to hard questions based on arrays, dp

Q1. Quick sort algorithm
Ans. 
Quick sort is a popular sorting algorithm that uses divide and conquer strategy.
• Divides array into smaller sub-arrays based on a pivot element

• Recursively sorts sub-arrays

• Combines sorted sub-arrays to get final sorted array

• Time complexity: O(n log n) on average, O(n^2) worst case

• Example: [3, 6, 8, 10, 1, 2, 1] -> [1, 1, 2, 3, 6, 8, 10]
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Q2. Modified rotate a matrix
Ans. 
Rotate a matrix by 90 degrees in place
• Transpose the matrix

• Reverse each row of the transposed matrix
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Q1. To print all permutation of a string
Ans. 
Use recursion to generate all possible permutations of a given string.
• Use recursion to swap characters in the string to generate permutations

• Keep track of visited characters to avoid duplicates

• Base case: when the length of the string is 1, add it to the result array
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Q1. Coin change Problem of finding number of ways to achieve K value
Ans. 
The coin change problem involves finding the number of ways to make a certain value using a given set of coins.
• Use dynamic programming to solve the coin change problem efficiently.

• Create a 1D array to store the number of ways to make each value from 0 to the target value.

• Iterate through the coins and update the array based on the current coin's value.

• The final answer will be stored in the last element of the array.

• Exam...read more
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Q1. Suduko solver question is given to me
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Create an API using Notepad to check if a string is a palindrome or not.

Q1. Solid principal
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2 questions, Easy and medium based

Q1. Stacks queues and array questions
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Q1. Technical questions on projects
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Q1. How to tackle any uncertain situations? Behavioural questions
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