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Unthinkable Solutions Software Developer Interview Questions and Answers for Freshers
9 Interview questions
Trapping Rain Water Problem Statement
You are given a long type array/list ARR of size N, representing an elevation map. The value ARR[i] denotes the elevation of the ith bar. Your task is to determine the...
The question asks to find the total amount of rainwater that can be trapped in the given elevation map.
Iterate through the array and find the maximum height on the left and right side of each bar.
Calculate the amount of water that can be trapped on each bar by subtracting its height from the minimum of the maximum heights on both sides.
Sum up the amount of water trapped on each bar to get the total amount of rainw...
Problem: Sort an Array of 0s, 1s, and 2s
Given an array/list ARR consisting of integers where each element is either 0, 1, or 2, your task is to sort this array in increasing order.
Input:
The input star...
The task is to sort an array of 0s, 1s, and 2s in increasing order.
Use a three-pointer approach to partition the array into three sections: 0s, 1s, and 2s.
Initialize three pointers: low, mid, and high. low points to the start of the array, mid points to the current element being processed, and high points to the end of the array.
While mid <= high, perform the following checks: if arr[mid] == 0, swap arr[low] and a...
Reverse String Word Wise Problem Statement
Your task is to reverse the given string word-wise. This means the last word in the string should appear first, the second last word should appear second, and so ...
The given string needs to be reversed word wise, keeping the individual words intact.
Split the string into an array of words using a space as the delimiter.
Reverse the array of words.
Join the reversed array of words using a space as the separator to form the final reversed string.
Sort Array by Reversing a Subarray
You are given an array of 'N' distinct integers, 'ARR'. Determine if it is possible to sort this array by selecting a continuous subarray and reversing it. Return 'true' ...
The question asks whether it is possible to sort an array by choosing a continuous subarray and reversing it.
Check if the array is already sorted. If yes, return true.
Find the first and last elements of the subarray that needs to be reversed.
Check if the subarray is in non-decreasing order. If yes, return true.
Check if the elements after the subarray are in non-increasing order. If yes, return true.
Otherwise, retu...
Find the Second Largest Element
Given an array or list of integers 'ARR', identify the second largest element in 'ARR'.
If a second largest element does not exist, return -1.
Example:
Input:
ARR = [2, ...
The task is to find the second largest element in an array of integers.
Iterate through the array and keep track of the largest and second largest elements.
Initialize the largest and second largest variables with the first two elements of the array.
Compare each element with the largest and second largest variables and update them accordingly.
Return the second largest element at the end.
Find Duplicate in Array Problem Statement
You are provided with an array of integers 'ARR' consisting of 'N' elements. Each integer is within the range [1, N-1], and the array contains exactly one duplicat...
The task is to find the duplicate element in an array of integers.
Iterate through the array and keep track of the frequency of each element using a hash map.
Return the element with a frequency greater than 1.
Alternatively, sort the array and check for adjacent elements with the same value.
Kth Largest Number Problem Statement
Design a data structure to process a stream of numbers and efficiently find the kth largest number at any given point in time.
Explanation:
You will receive a continu...
Design a data structure to efficiently find the kth largest number in a stream of numbers.
Implement a data structure that can store incoming numbers and efficiently retrieve the kth largest number.
Support addition of numbers and retrieval of the kth largest number.
Use a priority queue or heap data structure to maintain the k largest numbers in the stream.
Handle queries of adding numbers and retrieving the kth larg...
Binary Search Tree Search Problem
Given a Binary Search Tree (BST) consisting of 'N' nodes, where each node contains some integer data, your task is to determine whether there is a node in the BST whose da...
Given a Binary Search Tree, determine if a node with a given integer exists.
Traverse the BST in a way that compares the current node's data with the given integer 'X'.
If the current node's data is equal to 'X', return True.
If the current node's data is less than 'X', move to the right subtree; if greater, move to the left subtree.
Repeat this process until a match is found or the end of the tree is reached.
Remove Duplicates Problem Statement
You are given an array of integers. The task is to remove all duplicate elements and return the array while maintaining the order in which the elements were provided.
E...
Remove duplicates from an array while maintaining order.
Use a set to keep track of unique elements.
Iterate through the array and add elements to the set if not already present.
Convert the set back to an array to maintain order.
Unthinkable Solutions Software Developer Interview Experiences for Freshers
2 interviews found
Anonymous
I appeared for an interview in Jun 2021.
(2 Questions)
Round duration - 90 minutes
Round difficulty - Easy
The round was basically based on the DSA easy level questions. Platform was good enough to code easily
- Q1.
Trapping Rain Water Problem Statement
You are given a long type array/list
ARRof sizeN, representing an elevation map. The valueARR[i]denotes the elevation of theithbar. Your task is to determine th... - Ans.
The question asks to find the total amount of rainwater that can be trapped in the given elevation map.
Iterate through the array and find the maximum height on the left and right side of each bar.
Calculate the amount of water that can be trapped on each bar by subtracting its height from the minimum of the maximum heights on both sides.
Sum up the amount of water trapped on each bar to get the total amount of rainwater ...
- Q2.
Reverse String Word Wise Problem Statement
Your task is to reverse the given string word-wise. This means the last word in the string should appear first, the second last word should appear second, and so...
- Ans.
The given string needs to be reversed word wise, keeping the individual words intact.
Split the string into an array of words using a space as the delimiter.
Reverse the array of words.
Join the reversed array of words using a space as the separator to form the final reversed string.
(2 Questions)
Round duration - 20 minutes
Round difficulty - Easy
It is base on OOPS and Data structures.
- Q1.
Problem: Sort an Array of 0s, 1s, and 2s
Given an array/list
ARRconsisting of integers where each element is either 0, 1, or 2, your task is to sort this array in increasing order.Input:
The input sta...
- Ans.
The task is to sort an array of 0s, 1s, and 2s in increasing order.
Use a three-pointer approach to partition the array into three sections: 0s, 1s, and 2s.
Initialize three pointers: low, mid, and high. low points to the start of the array, mid points to the current element being processed, and high points to the end of the array.
While mid <= high, perform the following checks: if arr[mid] == 0, swap arr[low] and arr[mi...
- Q2.
Find the Second Largest Element
Given an array or list of integers 'ARR', identify the second largest element in 'ARR'.
If a second largest element does not exist, return -1.
Example:
Input:
ARR = [2,...
- Ans.
The task is to find the second largest element in an array of integers.
Iterate through the array and keep track of the largest and second largest elements.
Initialize the largest and second largest variables with the first two elements of the array.
Compare each element with the largest and second largest variables and update them accordingly.
Return the second largest element at the end.
(2 Questions)
Round duration - 20 minutes
Round difficulty - Medium
One Coding question and projects was discussed
- Q1.
Sort Array by Reversing a Subarray
You are given an array of 'N' distinct integers, 'ARR'. Determine if it is possible to sort this array by selecting a continuous subarray and reversing it. Return 'true'...
- Ans.
The question asks whether it is possible to sort an array by choosing a continuous subarray and reversing it.
Check if the array is already sorted. If yes, return true.
Find the first and last elements of the subarray that needs to be reversed.
Check if the subarray is in non-decreasing order. If yes, return true.
Check if the elements after the subarray are in non-increasing order. If yes, return true.
Otherwise, return fa...
- Q2.
Find Duplicate in Array Problem Statement
You are provided with an array of integers 'ARR' consisting of 'N' elements. Each integer is within the range [1, N-1], and the array contains exactly one duplica...
- Ans.
The task is to find the duplicate element in an array of integers.
Iterate through the array and keep track of the frequency of each element using a hash map.
Return the element with a frequency greater than 1.
Alternatively, sort the array and check for adjacent elements with the same value.
Interview Preparation Tips
Tip 1 - Practice Atleast 250 Questions
Tip 2 - Ex- Do atleast 2 projects
Tip 1 : Have some projects on resume.
Tip 2 : Do not put false things on resume.
Skills evaluated in this interview
I appeared for an interview in Nov 2020.
(1 Question)
Round duration - 90 minutes
Round difficulty - Easy
The 1st round was online coding + MCQ round. It had 3 sections in total to be solved in 95 mins.
Next comes the technical interview.
The technical interview lasted for about 45 minutes. It started with a basic introduction. Then, she framed some questions from my resume and projects which I have mentioned. Questions were mainly from Data structure, OS, DBMS, SQL. She told me to rate my data structure skill on a scale of 1 to 5.
- Q1.
Kth Largest Number Problem Statement
Design a data structure to process a stream of numbers and efficiently find the kth largest number at any given point in time.
Explanation:
You will receive a contin...
- Ans.
Design a data structure to efficiently find the kth largest number in a stream of numbers.
Implement a data structure that can store incoming numbers and efficiently retrieve the kth largest number.
Support addition of numbers and retrieval of the kth largest number.
Use a priority queue or heap data structure to maintain the k largest numbers in the stream.
Handle queries of adding numbers and retrieving the kth largest n...
(2 Questions)
Round duration - 30 minutes
Round difficulty - Easy
The technical interview lasted for about 45 minutes. It started with a basic introduction. Then, she framed some questions from my resume and projects which I have mentioned. Questions were mainly from Data structure, OS, DBMS, SQL. She told me to rate my data structure skill on a scale of 1 to 5.
- Q1.
Binary Search Tree Search Problem
Given a Binary Search Tree (BST) consisting of 'N' nodes, where each node contains some integer data, your task is to determine whether there is a node in the BST whose d...
- Ans.
Given a Binary Search Tree, determine if a node with a given integer exists.
Traverse the BST in a way that compares the current node's data with the given integer 'X'.
If the current node's data is equal to 'X', return True.
If the current node's data is less than 'X', move to the right subtree; if greater, move to the left subtree.
Repeat this process until a match is found or the end of the tree is reached.
- Q2.
Remove Duplicates Problem Statement
You are given an array of integers. The task is to remove all duplicate elements and return the array while maintaining the order in which the elements were provided.
...
- Ans.
Remove duplicates from an array while maintaining order.
Use a set to keep track of unique elements.
Iterate through the array and add elements to the set if not already present.
Convert the set back to an array to maintain order.
Interview Preparation Tips
Tip 1 : Read interview experience before interview
Tip 2 : Think loud about each coding question.
Tip 1 : Have some projects on resume.
Tip 2 : No spelling mistake
Tip 3 : Resume should be in proper format
Skills evaluated in this interview
Top trending discussions
Interview questions from similar companies
I appeared for an interview before Mar 2021.
Round duration - 30 minutes
Round difficulty - Medium
This was a MCQ round. 30 ques in 30 mins consisting of difficult quantitative aptitude questions were to be solved.
(2 Questions)
Round duration - 60 minutes
Round difficulty - Medium
In this test round, 2 coding questions were given. Either write the code or pseudo code
- Q1.
N Queens Problem
Given an integer
N, find all possible placements ofNqueens on anN x Nchessboard such that no two queens threaten each other.Explanation:
A queen can attack another queen if they ar...
- Ans.
The N Queens Problem involves finding all possible placements of N queens on an N x N chessboard without threatening each other.
Use backtracking algorithm to explore all possible configurations.
Keep track of rows, columns, and diagonals to ensure queens do not threaten each other.
Generate all valid configurations and print them out.
- Q2.
Sort 0 1 2 Problem Statement
Given an integer array
arrof size 'N' containing only 0s, 1s, and 2s, write an algorithm to sort the array.Input:
The first line contains an integer 'T' representing the n... - Ans.
Sort an array of 0s, 1s, and 2s in linear time complexity.
Use three pointers to keep track of 0s, 1s, and 2s while traversing the array.
Swap elements based on the values encountered to sort the array in-place.
Time complexity should be O(N) and space complexity should be O(1).
(2 Questions)
Round duration - 60 minutes
Round difficulty - Easy
This was a technical round with questions on DSA.
- Q1.
Reverse Words in a String: Problem Statement
You are given a string of length
N. Your task is to reverse the string word by word. The input may contain multiple spaces between words and may have leading o... - Ans.
Reverse words in a string while handling leading, trailing, and multiple spaces.
Split the input string by spaces to get individual words
Reverse the order of the words
Join the reversed words with a single space in between
- Q2.
Circular Linked List Detection
You are provided with the head of a linked list containing integers. Your task is to determine if the linked list is circular.
Note:
- A linked list is considered circula...
- Ans.
Detect if a given linked list is circular by checking if it forms a closed loop.
Traverse the linked list using two pointers, one moving at double the speed of the other.
If the two pointers meet at any point, the linked list is circular.
If the faster pointer reaches the end of the list (NULL), the linked list is not circular.
Round duration - 30 minutes
Round difficulty - Easy
HR round with typical behavioral problems.
Interview Preparation Tips
Tip 1 : Must do Previously asked Interview as well as Online Test Questions.
Tip 2 : Go through all the previous interview experiences from Codestudio and Leetcode.
Tip 3 : Do at-least 2 good projects and you must know every bit of them.
Tip 1 : Have at-least 2 good projects explained in short with all important points covered.
Tip 2 : Every skill must be mentioned.
Tip 3 : Focus on skills, projects and experiences more.
Skills evaluated in this interview
I applied via Naukri.com and was interviewed before Sep 2020. There were 3 interview rounds.
Interview Questionnaire
3 Questions
- Q1. Basics of Java ,MySQL
- Q2. For java do all object oriented programming (oops) concept very deeply
- Ans.
Java supports OOP concepts like encapsulation, inheritance, polymorphism, and abstraction, enhancing code reusability and maintainability.
Encapsulation: Bundling data and methods. Example: private variables with public getters/setters.
Inheritance: Deriving new classes from existing ones. Example: class Dog extends Animal.
Polymorphism: Ability to take many forms. Example: method overriding and overloading.
Abstraction: H...
- Q3. For mysql do all basics commands and query
- Ans.
Basic MySQL commands include creating databases, tables, inserting data, querying, updating, and deleting records.
CREATE DATABASE db_name; // Creates a new database
USE db_name; // Selects the database to use
CREATE TABLE table_name (column1 datatype, column2 datatype); // Creates a new table
INSERT INTO table_name (column1, column2) VALUES (value1, value2); // Inserts data into a table
SELECT * FROM table_name; // Retriev...
Interview Preparation Tips
I appeared for an interview in Oct 2020.
(1 Question)
Round duration - 90 minutes
Round difficulty - Easy
There were two section Aptitude and Coding.
- Q1.
Buy and Sell Stock Problem Statement
Imagine you are Harshad Mehta's friend, and you have been given the stock prices of a particular company for the next 'N' days. You can perform up to two buy-and-sell ...
- Ans.
The task is to determine the maximum profit that can be achieved by performing up to two buy-and-sell transactions on a given set of stock prices.
Iterate through the array of stock prices and calculate the maximum profit that can be achieved by buying and selling at different points.
Keep track of the maximum profit after the first transaction and the maximum profit overall by considering different combinations of buy a...
(1 Question)
Round duration - 60 minutes
Round difficulty - Easy
This was the first technical interview.
- Q1.
Pair Sum Problem Statement
You are given an integer array 'ARR' of size 'N' and an integer 'S'. Your task is to find and return a list of all pairs of elements where each sum of a pair equals 'S'.
Note:
... - Ans.
Find pairs of elements in an array that sum up to a given value, sorted in a specific order.
Iterate through the array and for each element, check if the complement (S - current element) exists in a hash set.
Keep track of pairs in a hash set to avoid duplicates.
Sort the pairs based on the criteria mentioned in the question.
Return the sorted list of pairs.
Interview Preparation Tips
Tip 1 : Prepare theory subjects well
Tip 2 : Start doing some development and learn a framework from 2nd year
Tip 1: Mention projects with technologies
Tip 2: Make important words in bold
Skills evaluated in this interview
Selected
I appeared for an interview in Feb 2025, where I was asked the following questions.
- Q1. Pattern printing.
- Q2. Javascript table tr
Aptitude,reasoning,verbal,C language,Java,C++
(2 Questions)
- Q1. What is interface in JAVA
- Ans.
An interface in Java is a reference type that defines a contract for classes to implement methods without providing their implementation.
Interfaces can contain method signatures and constants but no method bodies.
A class implements an interface using the 'implements' keyword. Example: 'class MyClass implements MyInterface'.
Multiple interfaces can be implemented by a single class, allowing for multiple inheritance of ty...
- Q2. Explain OOPS in JAVA
- Ans.
OOP in Java is a programming paradigm based on objects, enabling code reusability, encapsulation, inheritance, and polymorphism.
Encapsulation: Bundling data and methods that operate on the data within one unit (class). Example: private variables with public getters/setters.
Inheritance: Mechanism where one class inherits properties and behavior from another. Example: class Dog extends Animal.
Polymorphism: Ability to pre...
Interview Preparation Tips
I applied via Telegram and was interviewed in Dec 2021. There were 4 interview rounds.
Was taken on firefox Brower and was easy
Very basic questions like swap numbers etc
(3 Questions)
- Q1. Basic questions on cpp
- Q2. Opps concept like encapsulation etc
- Q3. Write a code to reverse a string
- Ans.
Code to reverse a string
Create an empty string to store the reversed string
Loop through the original string from end to start
Append each character to the empty string
Return the reversed string
Interview Preparation Tips
Was very rude to talk to and didn't communicate well enough.
Software Developer Interview Questions & Answers
Tudip Technologies
Sivaram Challa
posted on 25 Apr 2025
Selected
I appeared for an interview in Oct 2024, where I was asked the following questions.
- Q1. What are threads and how are they used
- Ans.
Threads are lightweight processes that enable concurrent execution within a program, improving efficiency and responsiveness.
Threads share the same memory space, allowing for faster communication compared to processes.
They are used in applications like web servers to handle multiple requests simultaneously.
Example: A web browser uses threads to load multiple tabs at once without freezing.
Threads can be created using li...
- Q2. What is RDBMA
Software Developer Interview Questions & Answers
Tudip Technologies
Niranjan Vinod Mali
posted on 15 May 2025
I appeared for an interview in Apr 2025, where I was asked the following questions.
- Q1. Tell me about your self
- Q2. Why should we hire you
- Q3. What are your strengths and weakness
- Q4. What is your role in your project
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