LinguaSol Interview Questions and Answers

Simple apptitude , java , dotnet ,c++ 100 MCQ questions for 60 min .

Q1. Explain Quick sort , Merge Sort algorithm
Ans. 
Quick sort and Merge sort are popular sorting algorithms used to efficiently sort arrays of elements.
• Quick sort: Divide and conquer algorithm, picks a pivot element and partitions the array around the pivot. Recursively sorts subarrays.

• Merge sort: Divide and conquer algorithm, divides the array into two halves, recursively sorts the halves, and then merges them back together.

• Example: Quick sort - [3, 6, 8, 10, 1, 2, 1]...read more
Answered by AI
Add your answer
Q2. What is Binary Serch Tree and its Time Complexity.
Ans. 
Binary Search Tree is a data structure where each node has at most two children, with left child smaller and right child larger. Time complexity is O(log n) for search, insert, and delete operations.
• Nodes have at most two children - left child is smaller, right child is larger

• Search, insert, and delete operations have time complexity of O(log n)

• Example: In a BST, if we search for a value, we can eliminate half of the r...read more
Answered by AI
Add your answer
Q3. Java code on HashMap().
Ans. 
HashMap is a data structure in Java that stores key-value pairs.
• HashMap is part of the Java Collections framework.

• Keys in a HashMap must be unique.

• Values in a HashMap can be duplicated.

• Example: HashMap<String, Integer> map = new HashMap<>();

• Example: map.put("John", 25);
Answered by AI
Add your answer
Q4. Write down the linked list implementation code .
Ans. 
Implementation of a linked list in code format
• Define a Node class with data and next pointer

• Create LinkedList class with methods like insert, delete, search

• Handle edge cases like empty list, inserting at beginning/end
Answered by AI
Add your answer
Q5. Difference between interface and abstract class
Ans. 
Interface defines only method signatures while abstract class can have method implementations.
• Interface cannot have method implementations, only method signatures

• Abstract class can have method implementations along with abstract methods

• A class can implement multiple interfaces but can only inherit from one abstract class

• Interfaces are used to achieve multiple inheritance in Java

• Abstract classes can have constructors wh...read more
Answered by AI
Add your answer
Q6. Difference between array and linked list ? Arraylist and LinkedList in collection framework
Ans. 
Array is a fixed-size data structure while linked list is a dynamic data structure. ArrayList and LinkedList are implementations of List interface in Java.
• Array is a contiguous block of memory with fixed size, while linked list is a collection of nodes where each node points to the next node.

• ArrayList in Java is implemented using an array, which can dynamically resize itself. LinkedList is implemented using nodes with ...read more
Answered by AI
Add your answer
Q7. What is polymorphism
Ans. 
Polymorphism is the ability of a single function or method to operate on different types of data.
• Polymorphism allows objects of different classes to be treated as objects of a common superclass.

• There are two types of polymorphism: compile-time (method overloading) and runtime (method overriding).

• Example: a superclass Animal with subclasses Dog and Cat. Both Dog and Cat can be treated as Animals.
Answered by AI
Add your answer