KLA Software Engineer Intern Trainee Interview Questions and Answers

Major questions were around problem solving, strings

1 easy, 1 medium and 1 hard LC

Q1. 1. How will access files in a different server? 2. There are several files all containing similar key value pairs. The values differ in all files. How will you identify all the values that are same and ot...read more
Ans. 
To access files in a different server, use protocols like FTP or SSH. To identify similar key value pairs in multiple files, compare values using a script or tool.
• Use FTP or SSH protocols to access files in a different server

• Write a script or use a tool to compare key value pairs in multiple files

• Identify values that are the same and different across files

• Example: Use Python script to read files and compare key value p...read more
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Q1. Reserve Binary Search Tree
Ans. 
A Reserve Binary Search Tree (RBST) is a data structure that maintains sorted order and allows efficient insertion, deletion, and search operations.
• An RBST is a self-balancing binary search tree that ensures logarithmic height for efficient operations.

• Insertion and deletion operations are performed while maintaining the binary search tree properties.

• Example: Inserting values 10, 20, 30 in sequence will balance the tree...read more
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Round duration - 60 minutes
Round difficulty - Medium

This round had 2 coding problems and we had to code it on hackerearth only.
The use of Outside IDE was forbidden.
The timing of test was 12:00 PM to 1:00 PM.

Q1. 
Merge Overlapping Intervals Problem Statement
Given a specified number of intervals, where each interval is represented by two integers denoting its boundaries, the task is to merge all overlapping interv...read more
Ans. 
Merge overlapping intervals and return sorted list of merged intervals.
• Iterate through intervals and merge overlapping ones

• Sort merged intervals based on starting times

• Handle edge cases like empty input or single interval

• Use a data structure like list or array to store merged intervals
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Q2. 
Search In Rotated Sorted Array Problem Statement
Given a rotated sorted array ARR of size 'N' and an integer 'K', determine the index at which 'K' is present in the array.
Note:
1. If 'K' is not present...read more
Ans. 
Given a rotated sorted array, find the index of a given integer 'K'.
• Use binary search to find the pivot point where the array is rotated.

• Based on the pivot point, perform binary search on the appropriate half of the array to find 'K'.

• Handle cases where 'K' is not present in the array by returning -1.
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Round duration - 60 minutes
Round difficulty - Medium

This was an Online F2F Technical Round conducted on CodePair : Hackerearth. So, Basically You have to Run and Submit ( Pass All Test cases) in the Interview Round also (Like normal Coding Test) in Hackerearth & along with that You should have to explain your Code and Approach to the Interviewers.
The Interviewers were helpful and didn't hesitate in giving hints.
Timing - 11:00 A.M to 12:00 P.M

Q1. 
Minimum Fountains Activation Problem
In this problem, you have a one-dimensional garden of length 'N'. Each position from 0 to 'N' has a fountain that can provide water to the garden up to a certain range...read more
Ans. 
Find the minimum number of fountains to activate to water the entire garden.
• Iterate through the array to find the coverage of each fountain.

• Keep track of the farthest coverage reached by activating fountains.

• Activate the fountain that covers the farthest point not yet covered.

• Repeat until the entire garden is watered.
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Q2. 
Bellman Ford Shortest Path Problem
Given a directed weighted graph comprised of vertices labeled 1 to N and M edges, where each edge connects two nodes u and v with a weight w representing the distance be...read more
Ans. 
Bellman Ford algorithm is used to find the shortest path in a graph with negative weights.
• Initialize distances from source to all vertices as infinity, and distance to source as 0.

• Relax all edges V-1 times to find shortest path.

• If any distance is updated in Vth iteration, then there is a negative weight cycle.

• Return the distance to destination vertex after V-1 iterations.

• Example: For the given graph, shortest path from...read more
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Round duration - 30 minutes
Round difficulty - Easy

This was a Google Meet Video Call. The HR was friendly and asked basic questions.
The timing was 2:00 PM to 2:30 PM.

Round duration - 45 minutes
Round difficulty - Medium

Its a zoom call interview which lasted for 45 minutes. initially there are two panel members in which one is very targetting at me. They asked me different type of questions like jumping from DSA to project then to python then again java. Its a mixed combo pack type interview. for each and every question they asked me the real time example. The discussion on my project lasted for 15-20 mins.

Q1. 
Count Set Bits Problem Statement
Given a positive integer N, compute the total number of '1's in the binary representation of all numbers from 1 to N. Return this count modulo 1e9+7 because the result can...read more
Ans. 
Count the total number of set bits in the binary representation of numbers from 1 to N modulo 1e9+7.
• Use bitwise operations to count the set bits in each number from 1 to N.

• Keep track of the total set bits and return the result modulo 1e9+7.

• Optimize the solution to handle large values of N efficiently.

• Consider using dynamic programming or precomputing values for faster computation.
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Round duration - 30 mins
Round difficulty - Easy

This round was a zoom interview. The interview started with my brief introduction. This time the interview was more interested in my hobbies and passions. He asked me what do you do to keep yourself updated with the latest technology trends?

Q1. Write your own stack?
Ans. 
A stack is a linear data structure that follows the Last In First Out (LIFO) principle.
• Implement using an array or linked list

• Push operation adds element to top of stack

• Pop operation removes element from top of stack

• Peek operation returns top element without removing it
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Q2. How to find intersection happened between two linked list?
Ans. 
To find intersection of two linked lists, traverse both lists and compare each node.
• Traverse both linked lists and compare each node

• Use two pointers, one for each linked list

• If a node is common, return the node

• If both pointers reach the end, return null
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