Coditas Technologies Sdet Automation Test Engineer Interview Questions and Answers

90 minute test on hacker rank consisting of 3 coding questions all of medium difficulty. Most candidates are required to solve more than 1 question.

Q1. Questions on concepts of OOPS and Operating Systems.
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Q2. Find least common ancestor of a binary tree.
Ans. 
Find the lowest common ancestor of a binary tree.
• Traverse the tree recursively from the root node.

• If the current node is null or matches either of the given nodes, return the current node.

• Recursively search for the nodes in the left and right subtrees.

• If both nodes are found in different subtrees, return the current node.

• If both nodes are found in the same subtree, continue the search in that subtree.
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Q3. Find first missing positive integer from an array for non-negative integers.
Ans. 
Find first missing positive integer from an array of non-negative integers.
• Create a hash set to store all positive integers in the array

• Loop through the array and add all positive integers to the hash set

• Loop through positive integers starting from 1 and return the first missing integer not in the hash set
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Q1. Design a parking lot
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Design a parking lot
• Consider the size and capacity of the parking lot

• Decide on the layout and organization of parking spaces

• Implement a system to manage parking availability and reservations

• Include features like ticketing, payment, and security

• Consider scalability and future expansion
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Q1. Given a grid which represents an ocean( For all index i,j if mat[i][j] = 1 is island and mat[i][j] = 0 means water). Find the island with largest area.
Ans. 
Find the largest island area in a grid representing an ocean using DFS or BFS.
• Use Depth-First Search (DFS) or Breadth-First Search (BFS) to explore the grid.

• Mark visited cells to avoid counting them multiple times.

• Count the size of each island during the traversal.

• Example: For a grid [[1,0,0],[1,1,0],[0,0,1]], the largest island has area 3.

• Keep track of the maximum area found during the exploration.
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Q2. Given list of strings group them into distinct anagrams.
Ans. 
Group list of strings into distinct anagrams.
• Create a hash table with sorted string as key and list of anagrams as value.

• Iterate through the list of strings and add each string to its corresponding anagram list in the hash table.

• Return the values of the hash table as a list of lists.
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Logical thinking and quantitative

One Java and one SQL and one js question

Q1. What is collections
Ans. 
Collections are data structures that store and organize multiple elements in a single unit.
• Collections provide methods to add, remove, and manipulate elements.

• Examples of collections include arrays, lists, sets, and maps.

• Collections can be used to efficiently manage and access large amounts of data.
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Q2. What is constructor
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A constructor is a special method in a class that is automatically called when an object of that class is created.
• Constructors have the same name as the class they belong to

• They are used to initialize the object's state

• Constructors can have parameters to customize the initialization process
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Q3. What is data science
Ans. 
Data science is a field that uses scientific methods, algorithms, and systems to extract knowledge and insights from structured and unstructured data.
• Data science involves collecting, analyzing, and interpreting large amounts of data to make informed decisions.

• It combines statistics, machine learning, and domain knowledge to uncover patterns and trends in data.

• Data scientists use programming languages like Python and R...read more
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45 questions were asked

3 questions were asked one from SQL and 2 from java

Q1. Oops concepts and java basics
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Q1. Four Pillars of OOPS in Java?
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Q2. What is a constructor in Java?
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Q1. What is the specific problem you are referring to?
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Q2. Why the specific
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Q3. Tell me about yourself.
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Q4. What are your reasons?
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Q5. What are your dreams?
Ans. 
My dreams revolve around creating impactful software, fostering innovation, and contributing to a collaborative tech community.
• Innovative Software Solutions: I aspire to develop applications that solve real-world problems, like a health tracking app that promotes wellness.

• Continuous Learning: I dream of mastering new technologies, such as AI and machine learning, to enhance my skill set and stay relevant.

• Mentorship and...read more
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Q6. What is your full name?
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Q7. What are your weaknesses?
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Identifying weaknesses helps in personal growth; common examples include perfectionism and difficulty in delegation.
• Perfectionism: I often spend too much time on details, which can delay project timelines. For instance, I once spent extra hours refining a UI component.

• Difficulty in Delegation: I sometimes struggle to delegate tasks, fearing that others may not meet my standards. This was evident in a team project where...read more
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Q8. What are your reasons for seeking employment?
Ans. 
I seek employment to grow my skills, contribute to innovative projects, and be part of a collaborative team in software development.
• Skill Development: I want to enhance my programming skills and learn new technologies, such as cloud computing or machine learning.

• Career Growth: I'm looking for opportunities to advance my career, potentially moving into leadership roles or specialized areas like DevOps.

• Passion for Innova...read more
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Q9. What do you consider to be your strengths?
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My strengths include problem-solving, adaptability, and strong communication skills, which enhance my effectiveness as a developer.
• Problem-Solving: I excel at breaking down complex problems into manageable parts. For example, I successfully debugged a critical issue in a production system by systematically isolating the problem and implementing a solution.

• Adaptability: I quickly learn new technologies and frameworks. W...read more
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Q10. Where do you see yourself in five years?
Ans. 
In five years, I envision myself as a lead software developer, driving innovative projects and mentoring junior developers.
• Leadership Role: I aim to progress into a lead developer position, guiding a team on complex projects, similar to how I led a successful app development in my last role.

• Technical Expertise: I plan to deepen my knowledge in emerging technologies like AI and cloud computing, contributing to projects ...read more
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Sorting algo , array question

Q1. Oops dbms coding basics
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