Coditas Technologies Senior Software Engineer Interview Questions and Answers

Q1. . Net technical
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Q1. Angular technical
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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.
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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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Round duration - 60 minutes
Round difficulty - Easy

It was my first round - they asked basics of OOPS,DBMS and operating systems. Be prepared with System Design also.

Q1. What are the ACID properties in database management systems?
Ans. 
ACID properties are a set of properties that guarantee reliability and consistency in database transactions.
• ACID stands for Atomicity, Consistency, Isolation, and Durability.

• Atomicity ensures that a transaction is treated as a single unit of work, either all of its operations are executed or none.

• Consistency ensures that a transaction brings the database from one valid state to another.

• Isolation ensures that concurrent...read more
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Q2. What is a transaction in the context of a Database Management System (DBMS)?
Ans. 
A transaction is a logical unit of work that consists of multiple database operations that must be executed as a single, indivisible unit.
• A transaction ensures data consistency and integrity.

• It follows the ACID properties: Atomicity, Consistency, Isolation, and Durability.

• Transactions are used to maintain data integrity in databases.

• Examples of transactions include transferring funds between bank accounts or updating i
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Q3. What is the difference between SQL and NoSQL databases?
Ans. 
SQL databases are relational databases that use structured query language, while NoSQL databases are non-relational databases that use various data models.
• SQL databases are based on a fixed schema, while NoSQL databases are schema-less.

• SQL databases are better suited for complex queries and structured data, while NoSQL databases are better for unstructured and semi-structured data.

• SQL databases ensure ACID (Atomicity, ...read more
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Q4. What is a semaphore?
Ans. 
A semaphore is a synchronization object that controls access to a shared resource through the use of a counter.
• Semaphores are used to manage concurrent access to shared resources in multi-threaded or multi-process environments.

• They can be used to limit the number of threads or processes that can access a resource simultaneously.

• Semaphores can have two types: counting semaphores and binary semaphores.

• Counting semaphores...read more
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Q5. How can you achieve multitasking in Java?
Ans. 
Multitasking in Java can be achieved using threads.
• Create multiple threads to execute tasks concurrently.

• Use the Thread class or the Runnable interface to define the tasks.

• Use synchronization mechanisms like locks or semaphores to coordinate access to shared resources.

• Java provides built-in support for multitasking with the Thread class and the Executor framework.

• Example: creating two threads to perform different tasks
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Q6. Can you design a schema for restaurant applications, similar to Zomato?
Ans. 
Design a schema for a restaurant app like Zomato.
• Create tables for restaurants, users, reviews, and orders

• Include columns for restaurant details like name, address, cuisine type

• Include columns for user details like name, email, and password

• Link reviews to restaurants and users

• Link orders to restaurants and users

• Consider additional tables for menu items, categories, and ratings
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A 1-hour long coding test was conducted

Q1. Hashing and collision in hashing
Ans. 
Hashing is a process of converting data into a fixed-size output. Collision occurs when two different inputs produce the same output.
• Hashing is used for indexing and retrieving data quickly

• Hash functions should be deterministic and produce the same output for the same input

• Collisions can be resolved using techniques like chaining or open addressing

• Examples of hashing algorithms include MD5, SHA-1, and SHA-256
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