Zellis Hr India Servicenow Developer Interview Questions and Answers

Q1. Basic from language
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Q2. Question from project if have done any
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For designer have to create page
And for coder simple coding questions

Q1. Ready to work with low salary
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About web development

Q1. Oops concept ,c#, ms sql ,web api
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Web api creation with single table and two table

Q1. What is your basic knowledge of Web Forms, ASP.NET, .NET Core, and SQL Server?
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Round duration - 105 minutes
Round difficulty - Medium

Yes, here comes the technical Round. Like other casual Interviews, it started with my introduction. and then the Interviewer asked me about OOPs Concepts and for every concept he asked for an example code. it took around 20 mins for this round and next he started asking questions from my project ( in which I mentioned ML Project ). From this he has asked Like why do you choose this algorithm and why did you learned ML. After That he moved to the problem solving part. He asked 6 questions on Problem solving. this took me around 30 mins to solve. I'll mention those problems in the below section. And he started asking me about tree's implementation. I answered him the theoretical part for the questions asked. and furtherly he asked me 6-7 SQL queries which took me around 20mins I remember. And from there he started asking questions about CN and OS. As I don't know about them- I replied Like i didn't have much Knowledge In these Sessions but I have Learned Some new technologies that are trending in the market. So, the key point for every Interview is like- we need not to be know everything it is up to us to in which area we are having interest and finally you should be able to show that you are expert in that and one more thing- Any job role is not expecting to be good at only one area of tech- So you should be able to convince the Interviewer that you are capable of understanding, learning new tech and to be have good team working skills.

Q1. Cycle Detection in a Singly Linked List
You have given a Singly Linked List of integers, determine if it forms a cycle or not.
A cycle occurs when a node's next points back to a previous node in the ...read more
Ans. Outer And Inner Loop
We are going to have two loops outer-loop and inner-loop 
1. Maintain a count of the number of nodes visited in outer-loop.
2. For every node of the outer-loop, start the inner loop from head.
3. If the inner-loop visits the node next to the outer-loop node, then return true, else repeat the process for the next iteration of outer-loop.
4. If outer-loop reaches the end of list or null, then return false.
Space ...read more
Answered by CodingNinjas
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Q2. Merge Sort Linked List
You are given a Singly Linked List of integers. Sort the Linked List using merge sort.
Merge Sort is a Divide and Conquer algorithm. It divides the input into two halves, calls its...read more
Ans. Merge Sort
We will use the ‘Merge Sort’ algorithm to sort the given linked list. Merge Sort is a Divide and Conquer algorithm. In this algorithm, we will divide the list into two parts, recursively sort the two parts and finally merge them such that the resultant list will be sorted.
 
Algorithm:
 
1. If the list contains only one node, return the head of the list.
2. Else, divide the list into two sublists. For this, we...read more
Answered by CodingNinjas
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Q3. Matrix Is Symmetric
You are given a square matrix, return true if the matrix is symmetric otherwise return false.
A symmetric matrix is that matrix whose transpose is equal to the matrix itself.
Exampl...read more
Ans. Brute Force
• Create another matrix ‘TRANSPOSE’ of the same size initially having all zeros.
• Now replace ‘TRANSPOSE’ (i,j) with ‘MATRIX’ (j,i).
• And now traverse both matrixes element by element if anywhere there is inequality return false, else continue.
• In the end, return true as you traverse.
Space Complexity: O(1)Explanation:
 O(N ^ 2), Where ‘N’ is the size of the square matrix.
 
Since an extra matrix of size ‘N’...read more
Answered by CodingNinjas
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Q4. Spiral Matrix
You are given a N x M matrix of integers, return the spiral path of the matrix
Example Of Spiral Path
Input Format:
The first line contains an integer 'T' which denotes the numb...read more
Ans. Spiral Matrix
Divide the matrix into loops. Print all the elements in the clockwise order from the first-outer layer, followed by the elements from the second outer layer, and so on. Use four loops to print all the elements. Every ‘for’ loop defines a single direction movement along with the matrix. The first loop represents the movement from left to right, the second loop represents the movement from top to bottom, the...read more
Answered by CodingNinjas
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Q5. Technical Questions
A program using most of the OOPs Concepts.
find the second highest salary in sql.
Write an SQL query to fetch all the Employees who are also managers from the EmployeeDetails table.
Write a...read more
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Q6. Height of the Binary Tree
You have been given the Inorder Traversal and Level Order Traversal of a Binary Tree of integers. Your task is to calculate the height of the Binary tree without constructing it.
...read more
Ans. Queue Solution
• The first element of the Level order Traversal is necessarily the root of the binary tree.
• The nodes which appear left of the root in the inorder traversal are necessarily in the left subtree, and those which appear in the right are in the right subtree of the right subtree.
• We can make use of the fact that the nodes of a subtree of the binary tree will form a continuous segment in the inorder array.
• We can ...read more
Answered by CodingNinjas
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Round duration - 45 minutes
Round difficulty - Medium

In this round Company Director for India team and HR has joined.
I started with my Introduction and he has asked what I know about the Company. I started saying everything from google and Wikipedia and from their official site. As this is a off campus recruitment he started explaining about the company what they do and the job role I have applied for. He said that the job was very challenging one and we'll be closely dealing with clients and meeting their expectations is quite challenging for the role. and then he started asking some real HR questions. for which I have answered in a cool way

Q1. Basic HR Questions
Can you describe your time management skills? 
What’s your absenteeism record like? 
Can I trust you with responsibilities?
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