Wolters Kluwer Associate Software Engineer Interview Questions and Answers

Round duration - 45 minutes
Round difficulty - Medium

Technical Interview 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...read more
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

• Handle leading, trailing, and multiple spaces appropriately
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Q2. 
Reverse a Stack Using Recursion
You are given a stack of integers. Your task is to reverse the stack using recursion without using any extra space other than the internal stack space used due to recursion...read more
Ans. 
Reverse a stack using recursion without using any extra space other than the internal stack space.
• Use recursion to pop all elements from the original stack and store them in function call stack.

• Once the stack is empty, push the elements back in reverse order.

• Base case of recursion should be when the original stack is empty.
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Round duration - 45 minutes
Round difficulty - Medium

Technical Interview round with questions on DSA.

Q1. 
Convert a Binary Tree to its Mirror Tree
Given a binary tree, convert this binary tree into its mirror tree. A binary tree is a tree in which each parent node has at most two children. The mirror of a bin...read more
Ans. 
Convert a binary tree to its mirror tree by interchanging left and right children of all non-leaf nodes.
• Traverse the binary tree in a recursive manner.

• Swap the left and right children of each non-leaf node.

• Continue this process until all nodes have been processed.
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Q2. 
Remove Nth Node from End of Linked List
You are given a singly linked list with 'N' nodes, each containing integer data, and an integer 'K'. Your goal is to remove the 'K'th node counting from the end of ...read more
Ans. 
Remove the Kth node from the end of a singly linked list.
• Use two pointers approach to find the Kth node from the end.

• Handle edge cases like removing the head node or removing the last node.

• Update the pointers to remove the Kth node and reconnect the list.
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Round duration - 30 minutes
Round difficulty - Easy

Typical Managerial round.

Round duration - 90 Minutes
Round difficulty - Medium

This was an online coding round where we had 2 questions to solve under 90 minutes . Both the questions were of easy to medium difficulty .

Q1. 
Nth Fibonacci Number Problem Statement
Calculate the Nth term in the Fibonacci sequence, where the sequence is defined as follows: F(n) = F(n-1) + F(n-2), with initial conditions F(1) = F(2) = 1.
Input:
...read more
Ans. 
Calculate the Nth Fibonacci number efficiently using dynamic programming.
• Use dynamic programming to store previously calculated Fibonacci numbers to avoid redundant calculations.

• Start with base cases F(1) and F(2) as 1, then iterate to calculate subsequent Fibonacci numbers.

• Time complexity can be optimized to O(N) using dynamic programming.

• Example: For N = 5, the 5th Fibonacci number is 5.
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Q2. 
K - Sum Path In A Binary Tree
Given a binary tree where each node contains an integer value, and a value 'K', your task is to find all the paths in the binary tree such that the sum of the node values in ...read more
Ans. 
Find all paths in a binary tree where the sum of node values equals a given value 'K'.
• Traverse the binary tree using depth-first search (DFS) and keep track of the current path and its sum.

• When reaching a leaf node, check if the sum equals 'K' and add the path to the result.

• Continue DFS traversal for both left and right children, passing updated path and sum.

• Return the list of paths that sum up to 'K'.
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Round duration - 60 Minutes
Round difficulty - Medium

This was a standard DSA round where I was asked to solve 1 question and also code it in a production ready manner . I was also asked 2 puzzles in this round to check my problem solving skills . This round ended with some basic concepts from DBMS and I was also asked some queries related to SQL .

Q1. 
Reverse Stack with Recursion
Reverse a given stack of integers using recursion. You must accomplish this without utilizing extra space beyond the internal stack space used by recursion. Additionally, you ...read more
Ans. 
Reverse a given stack of integers using recursion without using extra space or loop constructs.
• Use recursion to pop all elements from the original stack and store them in function call stack.

• Once the stack is empty, push the elements back in reverse order using recursion.

• Base case of recursion should be when the original stack is empty.
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Q2. You have a racetrack with 25 horses. What is the fastest way to determine the top 3 fastest horses, given that you can only race 5 horses at a time?
Ans. 
Race horses in groups of 5, then race the winners to determine the top 3 fastest horses.
• Divide the 25 horses into 5 groups of 5 horses each.

• Race the horses in each group to determine the fastest horse in each group.

• Race the winners from each group to determine the top 3 fastest horses.
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Q3. How can you measure exactly 4 liters of water using only a 3-liter can and a 5-liter can?
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Q4. What is meant by normalization and denormalization?
Ans. 
Normalization is the process of organizing data in a database to reduce redundancy and improve data integrity. Denormalization is the opposite process, adding redundancy to improve read performance.
• Normalization involves breaking down a table into smaller tables and defining relationships between them to reduce redundancy.

• Denormalization involves combining tables to reduce the number of joins needed for queries, improv...read more
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Q5. What is the difference between a primary key and a unique key in a database management system?
Ans. 
Primary key uniquely identifies a record in a table, while unique key ensures no duplicate values in a column.
• Primary key is used to uniquely identify each record in a table

• Primary key does not allow NULL values

• Unique key ensures that all values in a column are unique

• Unique key allows NULL values, except for the column with unique constraint

• A table can have only one primary key, but multiple unique keys
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Q6. Can you explain the concepts of Left Outer Join and Right Outer Join in DBMS?
Ans. 
Left Outer Join includes all records from the left table and matching records from the right table. Right Outer Join includes all records from the right table and matching records from the left table.
• Left Outer Join returns all records from the left table and the matched records from the right table. Unmatched records from the right table will have NULL values.

• Right Outer Join returns all records from the right table a...read more
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Q7. How do you find the second highest salary in a table?
Ans. 
To find the second highest salary in a table, you can use a SQL query with the ORDER BY and LIMIT clauses.
• Use a SQL query to select the distinct salaries in descending order: SELECT DISTINCT salary FROM table_name ORDER BY salary DESC

• Use the LIMIT clause to retrieve the second row: LIMIT 1,1

• Combine both queries to find the second highest salary: SELECT DISTINCT salary FROM table_name ORDER BY salary DESC LIMIT 1,1
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Round duration - 30 Minutes
Round difficulty - Easy

This was a typical HR round with some standard Behavioral questions like my interests, weaknesses, strengths, family background, why Amdocs, CEO of Amdocs etc.

Q1. What is something about you that is not included in your resume?
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