Hiver Software Developer Intern Interview Questions and Answers

1hr mostly was c questions focusing on pointers, arrays and strings. Few logical questions were there too

2hrs, 5 questions. 1 easy and 4 medium. All leetcode type problems with arrays, strings and matrix

2hrs, simple application development like creating a backend for shopping application. Only simple functions like adding products, quantity, ordering, if quantity is not there then refuse the order and such. Was not asked for DB implementations.

Q1. How to merge a list of sorted arrays in sorted order?
Ans. 
Merge sorted arrays using a min heap to maintain sorted order.
• Create a min heap and insert the first element from each array into the heap.

• Pop the smallest element from the heap and add it to the result array.

• Replace the popped element in the heap with the next element from the same array.

• Continue this process until all elements are merged.
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Q2. Simple discussions about oops, project etc
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Q1. Self introduction for 2 mins
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Q2. Why do you want to join Zoho?
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Q3. What kinda word does Zoho do
Ans. 
Zoho is a software company that provides cloud-based business applications.
• Zoho offers a suite of productivity and collaboration tools such as Zoho CRM, Zoho Books, and Zoho Projects.

• Zoho's products are designed to help businesses manage their operations more efficiently.

• Zoho's software is cloud-based, allowing users to access their data from anywhere with an internet connection.
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Coding round was there. Two coding questions were asked to solve in 1 hour. The difficulty was easy to medium.Leetcode questions of arrays and strings.

Q1. It was an online tech interview. There were two panelists. One asked me about my projects and gave me one coding question to solve which was based on matrices. And i was supposed to explain the approach an...read more
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Q2. After solving the question. In the same interview zoom meet HR asked me something about me and my family and thats it.
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Round duration - 90 minutes
Round difficulty - Easy

There were 3 coding questions. All of them were pretty easy and solvable in less than 30 minutes. Some string and pattern matching + some number theory problems were there.

Q1. 
Arithmetic Expression Evaluation Problem Statement
You are provided with a string expression consisting of characters '+', '-', '*', '/', '(', ')' and digits '0' to '9', representing an arithmetic express...read more
Ans. Reverse Polish Notation
Infix Expressions are harder for Computers to evaluate because of the additional work needed to decide precedence, so we first convert infix expressions into either postfix or prefix expressions.  In this approach, we convert Infix expression into Postfix expression also known as Reverse Polish Notation, and then evaluate the postfix expression using stack.  Note in postfix expression, ...read more
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Q2. 
Maximum Product Subarray Problem Statement
Given an array of integers, determine the contiguous subarray that produces the maximum product of its elements.
Explanation:
A subarray can be derived from th...read more
Ans. Brute-force
Steps:
1. Create an ans variable and initialize it to INT_MIN.
2. Run a loop i = 0 to N and do:
   • Run a loop j = i to N and do:
     • Create a variable, say currentProduct and initialize it to 1.
     • Run a loop k = i to j and do:
       • currentProduct = currentProduct * arr[k]
       • Store the maximum of ans and the currentProduct in the ans variable.
3. Finally, return the ans variable.
Space Complexity: O(1)Explanation:
O(1)
 
Constant space is u...read more
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Q3. 
Angle Calculation Between Clock Hands
Given a specific time in hours and minutes, your task is to calculate the smallest possible angle between the hour hand and the minute hand of a clock.
Example:
Inp...read more
Ans. Using reference time
• The idea is to take the 12:00 i.e. H = 12  and M = 0 as reference time.
• First,  calculate the angle made by the hour hand with respect to 12:00 in H hours and M minutes. In 12 hours the hour hand moves by 360 degrees i.e. 30 degrees in 1 hour and 0.5 degrees in 1 minute. So in H hours and M minutes, the angle moved by hour hand is  0.5 * (H * 60 + M).
• Then, calculate the angle made by m...read more
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Round duration - 45 minutes
Round difficulty - Medium

This was a technical round. First after properly introducing ourselves(me and the interviewer), we started with the main interview. I was asked 2 questions, one DS and Algorithms and the other System Design question.

Q1. 
Problem Statement: Sibling Nodes
You are provided with a Binary Tree consisting of 'N' nodes, where each node holds an integer value. Your objective is to identify and list all nodes that do not possess a...read more
Ans. DFS Approach
The idea here is to use the fact that if a node of the binary tree has two child nodes, then both of them will be siblings to each other, and if a node of the binary tree has only one child, then that child will not have any sibling.
Example 
In above figure 1 has two children, so nodes 3 and 4 are siblings to each other. Also, 3 has only one child, i.e., 5 and 5 have no sibling node.

So, we will use a df...read more
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Q2. Design an elevator system for a single building with N floors.
Ans. 
Tip 1 : Discuss first about how the product(here, elevator) will function.
Tip 2 : Start making with the most basic classes for the elevator.
Tip 3 : One by one after making the basic class, add new functionalities to it, taking care of all corner cases.
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Round duration - 60 minutes
Round difficulty - Medium

Hackerrank is a good paltform and very flexible, our webcam was turned on in order to prevent students from cheating

Q1. 
Find the Lone Set Bit
Your task is to identify the position of the only '1' bit in the binary representation of a given non-negative integer N. The representation contains exactly one '1' and the rest are...read more
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Q2. 
Count Ways to Reach the N-th Stair Problem Statement
You are provided with a number of stairs, and initially, you are located at the 0th stair. You need to reach the Nth stair, and you can climb one or tw...read more
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Round duration - 40 minutes
Round difficulty - Hard

Round was conducted on zoom platform. There were 40 students there and then each one of them were assigned break-out rroms for interviews.