Jupiter Money Software Developer Intern Interview Questions, Process, and Tips

20 MCQs + 2 Coding Question

Q1. Trapping Rain Water
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Q1. Questions on time and space complexity
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Q1. General Discussion
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Q1. DSA Round & Introduction Round
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Q2. DP Question related to subsequence
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Q1. Design Parking Lot
Ans. 
Design a parking lot system with multiple levels and spots for cars.
• Create a class for ParkingLot with attributes like levels, spots per level, etc.

• Implement methods for parking a car, removing a car, checking availability, etc.

• Consider implementing a ticketing system for tracking parked cars.

• Utilize data structures like arrays, lists, or maps to manage parking spots efficiently.
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Q2. Sort Numbers with large file
Ans. 
Use external sorting algorithm like merge sort to efficiently sort numbers in a large file.
• Break the large file into smaller chunks that can fit into memory

• Sort each chunk individually using a sorting algorithm like merge sort

• Merge the sorted chunks back together to get the final sorted result
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Easy doable questions ( can be completed in 30 mins)

Q1. Basic DSA, OOPS, SQL questions
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Q1. Complex and hard DSA problems( Dynamic programming questions) to be written on paper.
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Round duration - 90 minutes
Round difficulty - Easy

The online round had 2 coding questions and one question of a regular expression.

Q1. 
Find All Pairs Adding Up to Target
Given an array of integers ARR of length N and an integer Target, your task is to return all pairs of elements such that they add up to the Target.
Input:
The first line ...read more
Ans. 
Find all pairs of elements in an array that add up to a given target.
• Iterate through the array and for each element, check if the complement (target - current element) exists in a hash set.

• If the complement exists, add the pair to the result. If not, add the current element to the hash set.

• Handle cases where the same element is used twice in a pair (e.g., target = 6, array = [3, 3]).
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Q2. 
Increasing Subsegment Problem Statement
Given a sequence ARR consisting of N integers, your task is to identify the longest subsegment of ARR, where you can change at most one number to make the subsegmen...read more
Ans. 
Find the longest subsegment where at most one number can be changed to make it strictly increasing.
• Iterate through the array and keep track of the longest increasing subsegment with at most one change.

• If a number violates the increasing order, try changing it and check if the subsegment becomes strictly increasing.

• Update the length of the longest subsegment found so far.

• Return the length of the longest subsegment for e
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Round duration - 60 minutes
Round difficulty - Easy

First 10 minutes started with the Introduction. Then he asked about my projects. He seemed interested in my projects and asked a lot of questions about them. He asked questions related to Node Js, React Js, Mongo DB, AWS as all these were mentioned in my Resume. Around 25 minutes was completed explaining each and everything.

Then he started with the coding questions. I was allowed to share my screen and use any of my favourite text editors. I chose ‘VS Code’.

I was able to solve 2 coding questions very easily. I got stuck in the puzzle as I didn’t solve any puzzles before. I was able to come up with different approaches, but they weren’t the most optimal. He tried giving me a lot of hints but still wasn’t able to solve it. I had a positive can-do attitude throughout, and I was really close to solving it.

Feedback: He told me I performed well and asked if I had any questions for him. I asked for the solution to the puzzle. He explained to me the solution and I told him that I will practice puzzles.

Around 5-6 students got selected for 2nd Interview.

Q1. 
Move Zeros To Left
You are provided an array ARR of integers. Your task is to rearrange this array such that all elements with zero values are moved to the left, and all non-zero elements follow them, pre...read more
Ans. 
Rearrange array with zeros on the left and non-zeros on the right while maintaining original order.
• Iterate through the array from right to left, moving non-zero elements to the end of the array.

• Track the index where non-zero elements should be placed.

• Fill the beginning of the array with zeros and the rest with non-zero elements in their original order.
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Q2. 
Maximum Sum of Disjoint Pairs with Specific Difference
Given an array of integers and a number K, your task is to form pairs of elements from the array such that the absolute difference between them is st...read more
Ans. 
Find maximum sum of disjoint pairs with specific difference in an array.
• Sort the array in non-decreasing order.

• Iterate through the array and form pairs with absolute difference less than K.

• Keep track of the sum of disjoint pairs to maximize it.

• Return the maximum sum obtained.
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Round duration - 35 minutes
Round difficulty - Medium

It started with a brief Introduction and in-depth discussions on projects. He also asked me a lot of questions about my previous internship. He asked me some behavioural questions as well.

I was able to solve the question, and he did not ask me any other questions. This round was really short for me and was finished in around 35 minutes, well before time. I asked about my feedback, and he told me that the ‘HR’ will get back to me. I thought he was not satisfied with my answers and I will be rejected though I gave very good answers to every question.

3 students got selected for the next round. I think he was satisfied and did not want to waste more time asking questions.

Q1. 
Polynomial Simplification Problem Statement
You are provided with two arrays representing the coefficients and degrees of a polynomial expression. Your task is to simplify this polynomial into its general...read more
Ans. 
Simplify a polynomial expression by combining like terms and arranging them in descending order of degrees.
• Iterate through the coefficients and degrees arrays to combine like terms

• Create a new array to store the simplified polynomial in descending order of degrees

• Return the simplified polynomial array
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Round duration - 60 minutes
Round difficulty - Medium

It started with an introduction and discussion on projects. He seemed very curious about my project and went ahead to cross-question every functionality. We discussed everything and how the code works. He asked me a lot of questions on ‘Socket’ as my project mentioned it.

HR-related questions such as:
Why do you want to join the company?
Where do you see yourself in the next 5 years?
What are your strengths and weakness?

Round duration - 50 minutes
Round difficulty - Easy

Q1. 
Move Zeros to Left Problem Statement
Your task is to rearrange a given array ARR such that all zero elements appear at the beginning, followed by non-zero elements, while maintaining the relative order of...read more
Ans. 
Rearrange an array such that all zero elements appear at the beginning, followed by non-zero elements, maintaining relative order of non-zero elements.
• Iterate through the array and move all zero elements to the left side of the array while maintaining the relative order of non-zero elements.

• Use two pointers approach to swap elements efficiently.

• Ensure to solve the problem in linear time and constant space complexity.

• Ex...read more
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Q2. 
Rat in a Maze Problem Statement
Given a maze of size N * N with a rat placed at the top-left corner, find and print all possible paths that the rat can take to reach the bottom-right corner. The rat can m...read more
Ans. 
Find and print all possible paths for a rat to reach the bottom-right corner of a maze.
• Create a recursive function to explore all possible paths in the maze.

• Keep track of the current path and mark visited cells.

• Return the paths as matrices with 1 for cells in the path and 0 for others.
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Round duration - 60 minutes
Round difficulty - Medium

First 10 minutes started with the Introduction. Then he asked about my projects. He seemed interested in my projects and asked a lot of questions about them.

Q1. 
Matrix Chain Multiplication Problem Statement
You are provided with a chain of matrices A1, A2, A3, ..., An. The goal is to determine the minimum number of scalar multiplications needed to multiply these ...read more
Ans. 
The goal is to determine the minimum number of scalar multiplications needed to multiply a chain of matrices together.
• Understand the matrix chain multiplication problem statement and how the dimensions of matrices are defined by the input array.

• Implement a dynamic programming approach to find the minimum cost of matrix multiplication.

• Consider the constraints provided and optimize the solution accordingly.

• Test the solut...read more
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Q2. How would you design an application like Instagram?
Ans. 
Designing an application like Instagram involves creating a platform for sharing photos and videos with social networking features.
• Implement user profiles with the ability to upload, like, comment, and share photos/videos

• Develop a news feed algorithm to display content based on user preferences and interactions

• Include features like filters, hashtags, geotagging, and direct messaging

• Integrate push notifications for like...read more
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Round duration - 20 minutes
Round difficulty - Easy

Round duration - 60 Minutes
Round difficulty - Medium

This round was scheduled with the SDE-2, we started with the introduction than he jumped to the dsa questions. First question he asked me was leetcode 3 sum problem, we discussed the approach than I wrote the code for that problem. Second question was of arrays and maps I didn't remember the exact question but that was also some modified version of k sum subarray. Than he asked many questions related to oops, I answered most of them than he asked me for any qiuestions and we dropped the call.

Q1. 
Triplets with Given Sum Problem
Given an array or list ARR consisting of N integers, your task is to identify all distinct triplets within the array that sum up to a specified number K.
Explanation:
A t...read more
Ans. 
The task is to find all distinct triplets in an array that sum up to a specified number.
• Iterate through all possible triplets using three nested loops.

• Check if the sum of the triplet equals the target sum.

• Print the triplet if found, else print -1.
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Q2. 
K Sum Subset Problem Statement
You are provided with an array arr of size N and an integer K. Your objective is to compute the maximum sum of a subset of the array such that this sum does not exceed K.
E...read more
Ans. 
Find the maximum sum of a subset of an array that does not exceed a given value K.
• Sort the array in descending order to maximize the sum.

• Iterate through the array and add elements to the sum until it exceeds K.

• Return the sum obtained before exceeding K.
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Round duration - 40 Minutes
Round difficulty - Medium

This round was arranged with the Engineering Manager, we started with the introduction then he asked me to explain my project, I did that. After that he asked me one pattern question, I coded that than he asked me one more array question of finding mean, mode, median, I partially solved that question. Than he asked me for any questions and we dropped the call.

Q1. 
Diamond Pattern Grid Problem
Create a grid pattern of size R rows and C columns, where each cell contains a diamond-like shape of size S. The diamond shape is made with characters ‘/’ and ‘\’ for the bord...read more
Ans. 
Create a grid pattern with diamond shapes of given size in each cell.
• Iterate through each cell in the grid and construct the diamond shape based on the size provided.

• Use 'e' for the outer space, '/' and '' for the borders, 'o' for the inner space of the diamond.

• Adjust the positioning of characters based on the size of the diamond to create the desired pattern.
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Q2. 
Mean, Median, and Mode Problem Statement
Given an integer array ARR of size N, you need to compute the following three statistical measures:
1. Mean: Implement the function mean() to calculate the mean o...read more
Ans. 
Implement functions to calculate mean, median, and mode of an integer array.
• Calculate mean by summing all elements and dividing by total count

• Calculate median by sorting array and finding middle element(s)

• Calculate mode by finding element with highest frequency, return smallest if multiple
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