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A linked list is a data structure where each element points to the next element in the sequence.
Create a Node class with data and next pointer
Initialize a head pointer to the first node
Traverse the list by following the next pointers
Insert and delete nodes by updating pointers accordingly
Other methods of linked list include doubly linked list, circular linked list, and sorted linked list.
Doubly linked list: Each node has a reference to the next and previous node.
Circular linked list: Last node points back to the first node, forming a circle.
Sorted linked list: Nodes are arranged in a sorted order based on a specific criteria.
The start point of a linked list is the first node in the list.
The start point is typically referred to as the 'head' of the linked list.
It is the entry point for traversing the linked list.
Example: In a linked list with nodes A -> B -> C, A would be the start point.
I applied via Approached by Company and was interviewed in Oct 2024. There was 1 interview round.
A qualifier in Java is a keyword used to specify additional information about a variable or method.
Qualifiers include 'final', 'static', 'abstract', 'public', 'private', 'protected', etc.
They are used to define the behavior and access level of variables and methods.
For example, 'final' qualifier makes a variable constant and 'static' qualifier allows a method to be called without creating an instance of the class.
Primary annotation is used to indicate the primary key in a database table.
Primary annotation is used in Java Persistence API (JPA) to specify the primary key of an entity.
It is used with @Id annotation to define the primary key field in a database table.
Example: @Entity @Table(name = "employees") public class Employee { @Id @GeneratedValue(strategy = GenerationType.IDENTITY) @Column(name = "employee_id") p
I applied via Naukri.com and was interviewed in Jan 2024. There were 3 interview rounds.
Design a system similar to cars24, discussing components and design patterns.
Components: User interface, database, search engine, recommendation engine, payment gateway
Design pattern: Model-View-Controller (MVC)
User interface: Allow users to search for cars, view car details, and make purchases
Database: Store car information, user details, and transaction history
Search engine: Enable users to search for cars based on v...
Code to find the maximum time occupied room given meeting slots.
Sort the meeting slots based on start time.
Iterate through the sorted slots and keep track of the maximum occupied time.
Check for overlapping slots and update the maximum occupied time accordingly.
Code for singleton design pattern, binary search, and finding minimum number of coins needed
For singleton design pattern, create a private static instance variable and a private constructor
For binary search, divide the array in half and compare the middle element with the target
For finding minimum number of coins, use dynamic programming and iterate through the denominations
I appeared for an interview in Sep 2024, where I was asked the following questions.
Find pairs in a list of integers that sum to a specified target value.
Use a hash map to store numbers and their indices for quick lookup.
Iterate through the list and check if (target - current number) exists in the hash map.
Example: For list [1, 2, 3, 4] and target 5, pairs are (1, 4) and (2, 3).
Consider edge cases like duplicates and negative numbers.
Airtel Africa interview questions for popular designations
I applied via Recruitment Consulltant and was interviewed before Aug 2023. There were 4 interview rounds.
I applied via Approached by Company and was interviewed in Jun 2023. There were 4 interview rounds.
I applied via Approached by Company and was interviewed before May 2020. There were 3 interview rounds.
Two DSA questions, mostly on arrays
Quantitative, psychological, Thematic
I applied via Referral and was interviewed before Aug 2023. There was 1 interview round.
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