Wooqer Advertising Services Interview Questions and Answers

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Simple program asking javascript and data structures

Q1. DSA based Questions- Strings, Stack and Linked List
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Q1. DSA and Conceptual Based Question
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Q1. DSA questions & SQL queries
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Q1. Again dsa round
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Q1. HR + general questions based on internship, projects, etc
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Q1. DSA questions & SQL queries
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Q1. Again dsa round
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Q1. HR + general questions based on internship, projects, etc
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Q1. Based on Data Structures- Basic question like strings, stacks and Linked List
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Q1. This interview included DSA, Conceptual and Database Questions- It was one level harder than 1st round
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Q1. This round was with architect and it was also related to DSA and databse
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It was a mcq + coding round with computer fundamentals and aptitude + easy-medium level dsa questions.

It was an offline aptitute test with 30 questions for 30 minutes.

Q1. Detect a loop in the linked list
Ans. 
Detect a loop in a linked list by using Floyd's Cycle Detection Algorithm
• Use two pointers, slow and fast, to traverse the linked list

• If there is a loop, the fast pointer will eventually meet the slow pointer

• Initialize slow and fast pointers at the head of the linked list

• Move slow pointer by one step and fast pointer by two steps in each iteration

• If the fast pointer reaches the end of the list or meets the slow pointer,
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Q2. Find the unique element in an array
Ans. 
Find the unique element in an array of strings
• Iterate through the array and use a hashmap to store the frequency of each element

• After iterating, check the hashmap for elements with frequency 1 to find the unique element
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Q3. Tell about your projects
Ans. 
I have worked on various projects including a web application for a local business and a mobile app for tracking daily habits.
• Developed a web application using HTML, CSS, and JavaScript for a local business to manage their inventory and sales.

• Created a mobile app using React Native to track daily habits and provide reminders for healthy routines.

• Collaborated with a team to implement new features and fix bugs in existin...read more
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Q4. Write a MySQL query for selecting the id of second highest salary from employee table
Ans. 
MySQL query to select the id of second highest salary from employee table
• Use ORDER BY clause to sort salaries in descending order

• Use LIMIT to select the second row

• Use a subquery to avoid duplicates if multiple employees have the same salary
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Q1. Create basic react app with dummy data fetched from JSON API
Ans. 
Create a basic React app with dummy data fetched from a JSON API.
• Set up a new React project using create-react-app

• Create a component to fetch data from a JSON API using fetch or axios

• Display the fetched data in the component
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Q2. Array methods and Flatten array
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Q3. Event loop
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Q4. HTML and Javascript basics
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Basic Js concepts like debouncing,event loop, and other output-based questions.

Q1. Js concepts in depth
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Q1. Hiring manager round, questions around my project
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Q2. Optimization techniques
Ans. 
Optimization techniques are methods used to improve the efficiency and performance of software applications.
• Use algorithms like greedy, dynamic programming, or divide and conquer to optimize code

• Minimize time complexity by avoiding nested loops and unnecessary iterations

• Utilize data structures like hash tables, arrays, and trees for efficient storage and retrieval

• Profile code to identify bottlenecks and optimize critic...read more
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