UKG Sde1 Interview Questions and Answers

Q1. Explain OOPS concept and how you apply it in your implementation
Ans. 
OOPS is a programming paradigm based on the concept of objects, which can contain data in the form of fields and code in the form of procedures.
• OOPS focuses on the concept of classes and objects

• Encapsulation: bundling data and methods that operate on the data within a single unit

• Inheritance: allows a class to inherit properties and behavior from another class

• Polymorphism: ability to present the same interface for diffe...read more
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Q2. Difference between Comparable and Comparator. Difference between Abstract Class and Interface
Ans. 
Comparable is an interface used for natural ordering, Comparator is an interface used for custom ordering. Abstract class can have method implementations, Interface cannot.
• Comparable interface is used to define the natural ordering of objects. Example: String class implements Comparable interface for natural ordering based on alphabetical order.

• Comparator interface is used to define custom ordering of objects. Example:...read more
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Q3. Given a string. Find the number of occurrences of each character
Ans. 
Count occurrences of each character in a given string
• Create an array to store the count of each character

• Iterate through the string and increment the count of each character in the array

• Return the array with counts for each character
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Q4. Given an array. Remove the number of duplicates
Ans. 
Remove duplicates from an array of strings
• Iterate through the array and store each element in a set to keep track of unique values

• Create a new array with the unique values from the set
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Q5. Given a student object having name and grade data variables. Sort the object on the basis of highest grade.
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Q1. Large scale system design interview
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Two DSA questions related to Arrays & strings

Q1. Design URL shortener
Ans. 
Design a URL shortener service with features like shortening, redirecting, tracking, handling collisions, and providing analytics.
• Use a hashing algorithm to generate unique short URLs from long URLs

• Store mappings of short URLs to original URLs in a database

• Implement a redirect mechanism to direct users to the original URL when accessing the short URL

• Track the number of times each short URL is accessed and store this da...read more
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HashMaps and String-based questions

Q1. The interview asked 2 coding questions: 1. 2-Sum 2. Largest Palindrome in a string Apart from this there were questions on real life OOPS principles
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Q1. This was a resume drill-down on projects/skills. It had CS fundamental questions along with OOPs questions
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Q1. It was a manager round having standard team based/ situation based leadership questions
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Q1. Standard HR questions- strength/weakness
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Q1. SOLID Principles
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Q1. Rate Limiter with possible test cases
Ans. 
Rate limiter is a mechanism to control the rate of requests sent to a server
• Implement a sliding window algorithm to track the number of requests within a specific time frame

• Set a limit on the number of requests allowed per unit of time

• Return an error response when the limit is exceeded

• Test cases: 1. Send requests below the limit - should be successful. 2. Send requests above the limit - should receive an error response
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Q1. Rank teams based on some criteria
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Q1. Job scheduler system design round
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Q1. Project details question
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2 questions on coding

Q1. Coding test on few ques
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Q1. How was the experience
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Q2. Expected CTC that is
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2 coding questions with difficulty level easy to medium and duration was 1hr in HackerEarth.

Q1. This round went very well, panelist asked basic coding questions and one logic question.
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Q2. 1. reverse a string 2. find the 2nd max value in a array 3. write a code for BST
Ans. 
This JSON response provides answers to three interview questions for a Software Engineer position.
• To reverse a string, you can use built-in string manipulation functions or iterate through the string and swap characters from both ends.

• To find the 2nd max value in an array, you can sort the array in descending order and return the element at index 1.

• To write a code for a Binary Search Tree (BST), you need to define a No...read more
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Q1. This round is mostly based on my resume based question
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Q2. What projects have you done and asked about internship where I have worked recently.
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