Worldline Full Stack Developer Interview Questions and Answers

Round duration - 70 minutes
Round difficulty - Easy

there was some coding questions and some mcqs related to js, html, css, java and aptitude.

Q1. 
Bridge in Graph Problem Statement
Given an undirected graph with V vertices and E edges, your task is to find all the bridges in this graph. A bridge is an edge that, when removed, increases the number of...read more
Add your answer
Q2. 
House Robber Problem Statement
Mr. X is a professional robber with a plan to rob houses arranged in a circular street. Each house has a certain amount of money hidden, separated by a security system that ...read more
Add your answer

Round duration - 90 minutes
Round difficulty - Medium

It was in the evening, at around 3 - 4 PM. There were 3 coding questions. One easy, two moderate ones. The platform had autocomplete feature too.

Q1. 
Problem Statement: Parity Move
You have an array of integers, and your task is to modify the array by moving all even numbers to the beginning while placing all odd numbers at the end. The order within ev...read more
Ans. 
Move all even numbers to the beginning and odd numbers to the end of an array.
• Iterate through the array and swap even numbers to the front and odd numbers to the back.

• Use two pointers, one starting from the beginning and one from the end, to achieve the desired arrangement.

• Return the modified array with even numbers at the start and odd numbers at the end.
Answered by AI
Add your answer
Q2. 
Anagram Pairs Verification Problem
Your task is to determine if two given strings are anagrams of each other. Two strings are considered anagrams if you can rearrange the letters of one string to form the...read more
Add your answer
Q3. 
LCA in a Binary Search Tree
You are given a binary search tree (BST) containing N nodes. Additionally, you have references to two nodes, P and Q, within this BST.
Your task is to determine the Lowest Com...read more
Add your answer

Round duration - 50 Minutes
Round difficulty - Medium

They asked 2 coding questions and 2 sql queries in this round

Q1. 
Find the Longest Palindromic Substring
Given a string ‘S’ composed of lowercase English letters, your task is to identify the longest palindromic substring within ‘S’.
If there are multiple longest palin...read more
Add your answer
Q2. 
Trapping Rain Water Problem Statement
You are given a long type array/list ARR of size N, representing an elevation map. The value ARR[i] denotes the elevation of the ith bar. Your task is to determine th...read more
Add your answer
Q3. What is a nested SQL query?
Ans. 
A nested SQL query is a query within another query, used to retrieve data from multiple tables in a single query.
• Nested queries are enclosed within parentheses and can be used in SELECT, INSERT, UPDATE, or DELETE statements.

• They are commonly used to perform subqueries to filter results based on the output of the inner query.

• Example: SELECT * FROM table1 WHERE column1 IN (SELECT column2 FROM table2 WHERE condition);
Answered by AI
Add your answer

Round duration - 50 Minutes
Round difficulty - Medium

This round was about OS, networking and my projects. What are the different ways to style a React component?
Name a few techniques to optimize React app performance.

Round duration - 30 Minutes
Round difficulty - Easy

It was a fun round, in which they ask about your preferences about programming languages, technologies or your hobbies. If you reach this round, it means that your chances of selection are 99%.

Q1. What was the biggest hurdle you faced while developing a project?
Add your answer

Q1. Sal queries simeple data structure question finding largest number in am array.
Add your answer
Q2. Solid principal
Add your answer

Round duration - 70 minutes
Round difficulty - Medium

There were 3 problems 1 was easy and 2 were of medium types.

Q1. 
Odd Even Levels in Binary Tree
Given a binary tree, the task is to compute the modulus of the difference between the sum of nodes at odd levels and the sum of nodes at even levels.
Input:
The first line...read more
Ans. 
The task is to compute the modulus of the difference between the sum of nodes at odd levels and the sum of nodes at even levels in a binary tree.
• Traverse the binary tree level by level and calculate the sum of nodes at odd and even levels separately.

• Find the absolute difference between the sums and return the modulus of this difference.

• Handle null nodes by skipping them during the sum calculation.
Answered by AI
Add your answer
Q2. 
Rotting Oranges Problem Statement
You are given a grid containing oranges where each cell of the grid can contain one of the three integer values:
• 0 - representing an empty cell
• 1 - representing a fre...read more
Add your answer

Round duration - 50 minutes
Round difficulty - Medium

the interviewer was very polite and straightforward, he didn't ask me to introduce myself and he directly jumps to the coding problems.
What is new about the relationship between the and tags in HTML5?
Explain Components, Modules and Services in Angular

Q1. 
Circular Move Problem Statement
You have a robot currently positioned at the origin (0, 0) on a two-dimensional grid, facing the north direction. You are given a sequence of moves in the form of a string ...read more
Add your answer

Round duration - 70 minutes
Round difficulty - Easy

What is a View in sql? What are the TRUNCATE, DELETE and DROP statements?

Q1. 
Rotate Matrix by 90 Degrees Problem Statement
Given a square matrix 'MATRIX' of non-negative integers, rotate the matrix by 90 degrees in an anti-clockwise direction using only constant extra space.
Inpu...read more
Add your answer
Q2. 
Minimum Characters to Make a String Palindrome
Given a string STR of length N, determine the minimum number of characters to be added to the front of the string to make it a palindrome.
Input:
The first...read more
Ans. 
The task is to find the minimum number of characters needed to be added to the front of a string to make it a palindrome.
• Iterate through the string from both ends and count the number of characters that need to be added to make it a palindrome.

• Use two pointers approach to compare characters from start and end of the string.

• Keep track of the count of characters needed to be added to form a palindrome.
Answered by AI
Add your answer

Round duration - 20 minutes
Round difficulty - Easy

Q1. System design interview
Add your answer

Q1. What are the java 1.8 features?
Ans. 
Java 1.8 introduced several new features including lambda expressions, functional interfaces, streams, and default methods.
• Lambda expressions allow you to write code in a more concise and readable way.

• Functional interfaces are interfaces with a single abstract method, used for lambda expressions.

• Streams provide a way to work with sequences of elements and perform operations on them.

• Default methods allow interfaces to h...read more
Answered by AI
Add your answer
Q2. Write program to print element sorting by using java 8 feature.
Ans. 
Program to print elements sorted using Java 8 features
• Use Stream API to sort the elements

• Use lambda expressions for sorting

• Use the sorted() method to sort the elements
Answered by AI
Add your answer

It will be a basic maths questions.

As a general topic of trend in world.

To be known for programming knowledge about us.

Q1. Programming oridanited
Add your answer
Q2. Skill knowledge questions
Add your answer

Q1. Tell me about your self.
Ans. 
I am a passionate Full Stack Developer with experience in building web applications using various technologies.
• Experienced in front-end technologies like HTML, CSS, JavaScript, and frameworks like React and Angular

• Proficient in back-end technologies like Node.js, Express, and databases like MongoDB and SQL

• Familiar with version control systems like Git and deployment tools like Heroku
Answered by AI
Add your answer
Q2. Family background .
Ans. 
I come from a close-knit family that values education and creativity, fostering a supportive environment for personal growth.
• My parents are both educators, which instilled a love for learning in me from a young age.

• I have two siblings; we often collaborate on projects, blending our skills in technology and design.

• Family gatherings are filled with discussions about our latest endeavors, whether in tech or other creative...read more
Answered by AI
Add your answer