Ideate Informatics Software Developer Interview Questions and Answers

Q1. Where do you see yourself in 5 years?
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Q2. It was good it was nice it was good It was amazing.
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Round duration - 60 Minutes
Round difficulty - Easy

Coding round on
1. Array 
2. linked list

Q1. 
Subarray With Given Sum Problem Statement
Given an array ARR of N integers and an integer S, determine if there exists a contiguous subarray within the array with a sum equal to S. If such a subarray exis...read more
Ans. 
Given an array of integers, find a subarray with a given sum S.
• Iterate through the array while keeping track of the sum of elements encountered so far.

• Use a hashmap to store the cumulative sum and its corresponding index.

• If the current sum minus the target sum is found in the hashmap, a subarray with the target sum exists.

• Return the start and end indices of the subarray if found, otherwise return [-1, -1].
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Q2. 
Reverse Linked List Problem Statement
Given a singly linked list of integers, return the head of the reversed linked list.
Example:
Initial linked list: 1 -> 2 -> 3 -> 4 -> NULL
Reversed link...read more
Ans. 
Reverse a singly linked list of integers and return the head of the reversed linked list.
• Iterate through the linked list and reverse the pointers to point to the previous node.

• Use three pointers to keep track of the current, previous, and next nodes.

• Update the head of the reversed linked list as the last node encountered.

• Time complexity: O(N), Space complexity: O(1).
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Round duration - 30 Minutes
Round difficulty - Medium

HR Round

Round duration - 90 Minutes
Round difficulty - Medium

2 coding questions and 20 mcq
 

Q1. 
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
Ans. 
Find the minimum time required to rot all fresh oranges in a grid.
• Use Breadth First Search (BFS) to simulate the rotting process.

• Track the time taken to rot all oranges and return -1 if any fresh oranges remain.

• Handle edge cases like no fresh oranges or all oranges already rotten.

• Consider using a queue to efficiently process adjacent oranges.

• Ensure to update the grid with the new state of oranges after each second.
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Q2. 
Calculate Sum of Proper Divisors
Given a natural number N, return the sum of all its proper divisors.
A proper divisor of Y is defined as a number X such that X < Y and Y % X = 0.
Example:
Input:
T...read more
Ans. 
Calculate the sum of proper divisors of a given natural number.
• Iterate from 1 to sqrt(N) and check for divisors

• If a divisor is found, add it to the sum and also add N/divisor if it is not the same as divisor

• Return the sum as the result
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Round duration - 45 Minutes
Round difficulty - Medium

Technical interview

Q1. 
Rearrange Array to Form Largest Number
Given an array ARR consisting of non-negative integers, rearrange the numbers to form the largest possible number. The digits within each number cannot be changed.
...read more
Ans. 
Rearrange the array elements to form the largest possible number by concatenating them.
• Sort the array elements in a custom comparator function to get the largest number.

• Convert the sorted array elements to strings and concatenate them to form the final number.

• Handle cases where the numbers have the same prefix by comparing the concatenated forms.
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Q1. What is meant by @qualifier and @autowired
Ans. 
Annotations used in Spring framework for dependency injection
• Used in Spring framework to inject dependencies

• Qualifier is used to specify which bean to autowire when multiple beans of the same type exist

• Autowired is used to automatically inject the dependency
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Q2. What is meant by @data annotation and @value annotation
Ans. 
The @Data annotation is used in Java to declare a class as a data class, while the @Value annotation is used in Spring to create immutable objects.
• The @Data annotation in Java is used to generate getters, setters, toString, equals, and hashCode methods for a class.

• The @Value annotation in Spring is used to create immutable objects with final fields that are initialized through constructor injection.

• Both annotations hel...read more
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Q3. What is meant by @configuration annotation
Ans. 
Annotation used in Spring framework to indicate that a class declares one or more @Bean methods
• Used in Spring framework to define configuration classes

• Indicates that a class should be considered as a source of bean definitions

• Helps Spring to understand the configuration and create beans accordingly
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Q4. How to read the values from application properties file
Ans. 
To read values from application properties file, use a properties file reader in the programming language being used.
• Use a properties file reader class in the programming language being used (e.g. Properties class in Java).

• Load the properties file using the reader class.

• Access the values using keys specified in the properties file.
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Q5. Difference between map and flatmap
Ans. 
Map applies a function to each element in a collection and returns a new collection. FlatMap applies a function that returns a collection for each element and flattens the result into a single collection.
• Map transforms each element of a collection using a function and returns a new collection of the same size.

• FlatMap transforms each element of a collection using a function that returns a collection, then flattens the r...read more
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Q6. Difference between array list and linked list..where do we use ?
Ans. 
Array list stores elements in contiguous memory locations, while linked list stores elements in nodes with pointers to the next node.
• Array list allows fast access to elements using index, while linked list allows for fast insertion and deletion of elements.

• Array list is ideal for scenarios where random access is required, while linked list is suitable for scenarios where frequent insertion and deletion operations are n...read more
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Q7. What is immutable class
Ans. 
Immutable class is a class whose instances cannot be modified after creation.
• Immutable class instances have all fields as final and private.

• Immutable classes have no setter methods, only getter methods.

• Examples of immutable classes in Java are String, Integer, and LocalDate.
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Q8. Write a sample code using @functional annotation
Ans. 
Sample code using @functional annotation
• Use @FunctionalInterface annotation to declare a functional interface in Java

• Functional interfaces have exactly one abstract method

• Example: @FunctionalInterface interface MyFunctionalInterface { void myMethod(); }
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Q9. What is the usage of method reference
Ans. 
Method reference is a shorthand syntax for lambda expressions to call a method.
• Method reference can be used to refer to static methods, instance methods, and constructors.

• It helps in improving code readability and conciseness.

• Example: list.forEach(System.out::println) is equivalent to list.forEach(item -> System.out.println(item)).
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Q10. What are the intermediate operations in java8
Ans. 
Intermediate operations in Java 8 are used to process the stream elements and produce a new stream as output.
• Intermediate operations are lazy and do not start processing the stream until a terminal operation is invoked.

• Examples of intermediate operations include filter, map, sorted, distinct, limit, and skip.

• Intermediate operations can be chained together to form a pipeline of operations on a stream.
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Q11. What are the features of java8
Ans. 
Java 8 introduced several new features including lambda expressions, functional interfaces, streams, and the new date and time API.
• Lambda expressions allow you to write code in a more concise and readable way.

• Functional interfaces provide a way to define interfaces with a single abstract method.

• Streams allow for processing sequences of elements in a functional style.

• The new date and time API provides improved date and
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Q12. Write a code to find out which pairs in the array list will give the sum as 8
Ans. 
Code to find pairs in array list with sum 8
• Iterate through array and check if pair sum is 8

• Use a hashmap to store elements and their complements

• Time complexity O(n)
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Q13. What is the use of static class
Ans. 
Static class is used to create classes that cannot be instantiated and can only have static members.
• Static class cannot be instantiated, meaning you cannot create an object of a static class.

• Static class can only have static members such as static fields, methods, properties, and events.

• Static classes are commonly used for utility classes where all members are static and do not require an instance to be accessed.
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Q14. Write a code to print the even numbers as well as the squares of it in java8
Ans. 
Code to print even numbers and their squares in Java8
• Use Java8 Stream API to generate even numbers

• Map each even number to its square using map() function

• Print the even numbers and their squares using forEach() function
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Q15. How to communicate two api’s in springboot.Explain the implementation
Ans. 
To communicate two APIs in Spring Boot, you can use RestTemplate or WebClient to make HTTP requests.
• Use RestTemplate to make synchronous HTTP requests between APIs

• Use WebClient to make asynchronous HTTP requests between APIs

• Implement error handling and exception handling for robust communication

• Consider using Feign client for declarative REST client

• Ensure proper authentication and authorization mechanisms are in place
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Q16. What is the restcontroller and controller annotation
Ans. 
RestController and Controller annotations are used in Spring framework to define classes as controllers for handling HTTP requests.
• RestController annotation is used to define a class as a RESTful web service controller, which returns data in JSON or XML format.

• Controller annotation is used to define a class as a traditional Spring MVC controller, which returns a view to the client.

• Both annotations are used to handle HT...read more
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Q17. What is parallel stream
Ans. 
Parallel stream is a feature in Java that allows processing elements of a stream concurrently.
• Parallel stream can be created from a regular stream using parallel() method.

• It utilizes multiple threads to process elements in parallel, improving performance for large datasets.

• However, parallel stream may not always be faster than sequential stream due to overhead of managing multiple threads.

• Example: List list = Arrays.as...read more
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Q18. What is stream in java8
Ans. 
Streams in Java 8 are sequences of elements that support functional-style operations.
• Streams allow for processing sequences of elements in a functional way

• They can be created from collections, arrays, or I/O resources

• Common operations on streams include map, filter, reduce, and collect
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Q19. What is collection
Ans. 
A collection is a group of related objects or data items that are stored together.
• Collections can be used to store and manipulate multiple items of the same type.

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

• Collections provide methods for adding, removing, and accessing items in the group.
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Q20. What is singleton
Ans. 
Singleton is a design pattern that restricts the instantiation of a class to one object.
• Ensures a class has only one instance and provides a global point of access to it

• Commonly used in scenarios where only a single instance of a class is needed, such as database connections or configuration settings

• Implemented by creating a static method that returns the same instance of the class every time it is called
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Questions were asked on the language along with program logics

Q1. Salary expectation
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Q2. 4.5 lpa was the salary that I asked
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