Trell Frontend Developer Intern Interview Questions and Answers

Basic aptitude with tracing program

3 problem with easy to hard

Consists of 5 questions of DSA
1 Knapsack, 1 bitwise, 1 string , 1 basic mathematics, 1 dynamic programming

Q1. Based on Coding question and dbms and question based on resume.
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Q1. Recursive approach for printing prime number It was taken by CTO of company
Ans. 
A recursive approach to print prime numbers involves checking divisibility and using recursion to iterate through numbers.
• Define a function to check if a number is prime.

• Use recursion to iterate through numbers starting from 2.

• For each number, check if it is prime and print it if true.

• Base case: Stop recursion when a certain limit is reached.
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Was bit tough and need to concentrate on work time

Was about coding in any language such as Java python

Q1. 2 code and 2 MySQL query
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Q1. Tell me about yourself
Ans. 
I am a passionate software developer with experience in Java, Python, and web development.
• Graduated with a degree in Computer Science

• Worked on various projects using Java and Python

• Familiar with web development technologies like HTML, CSS, and JavaScript
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General aptitude focused on mathematics.

Round duration - 60 Minutes
Round difficulty - Easy

Q1. 
0/1 Knapsack Problem Statement
A thief is planning to rob a store and can carry a maximum weight of 'W' in his knapsack. The store contains 'N' items where the ith item has a weight of 'wi' and a value of...read more
Ans. 
Yes, the 0/1 Knapsack problem can be solved using dynamic programming with a space complexity of not more than O(W).
• Use a 1D array to store the maximum value that can be stolen for each weight capacity from 0 to W.

• Iterate through each item and update the array based on whether including the item would increase the total value.

• The final value in the array at index W will be the maximum value that can be stolen.
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Q2. 
Find the Second Largest Element
Given an array or list of integers 'ARR', identify the second largest element in 'ARR'.
If a second largest element does not exist, return -1.
Example:
Input:
ARR = [2,...read more
Ans. 
Find the second largest element in an array of integers.
• Iterate through the array to find the largest and second largest elements.

• Handle cases where all elements are identical.

• Return -1 if a second largest element does not exist.
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Round duration - 60 Minutes
Round difficulty - Easy

System Design Round

Q1. Design a system for Twitter, discussing its architecture, key components, and scalability considerations.
Ans. 
Design a scalable system for Twitter with key components and architecture.
• Use microservices architecture for scalability and fault isolation.

• Key components include user service, tweet service, timeline service, and notification service.

• Use a distributed database like Cassandra for storing tweets and user data.

• Implement a message queue like Kafka for handling real-time updates and notifications.

• Use a caching layer like ...read more
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Round duration - 30 Minutes
Round difficulty - Easy

It is just a formality

2 Graph question of leetcode

Q1. DSA Questions of leetcode
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Q2. DSA Questions
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