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_Operating System RoadMap | |-- Kernel | |-- Memory Management | | |-- Paging | | |-- Segmentation | | |-- Virtual Memory | | | |-- Process Management | | |-- Process Scheduling | | |-- Inter-Process Communication (IPC) | | |-- Threads | | | |-- File System | | |-- File I/O | | |-- Directory Structure | | |-- File Permissions | | | |-- Device Drivers | | |-- Communication with Hardware | | |-- Input/Output (I/O) | | | |-- System Calls | |-- Interface to Kernel Functionality | |-- Examples: open(), read(), write(), etc. | |-- Memory Management | |-- RAM | | |-- Stack | | |-- Heap | | |-- Data Segment | | |-- Code Segment | | | |-- Cache | | |-- L1, L2, L3 Caches | | | |-- Virtual Memory | |-- Page Table | |-- Page Replacement Algorithms | |-- Swapping | |-- File System | |-- File Organization | |-- File Allocation Table (FAT) | |-- Inodes | |-- File Access Methods | |-- Networking | |-- TCP/IP | |-- Protocols | |-- Network Stack | |-- Routing | |-- Firewalls | |-- Security | |-- Authentication | |-- Authorization | |-- Encryption | |-- Access Control Lists (ACL) | |-- Process Management | |-- PCB (Process Control Block) | |-- Context Switching | |-- Deadlocks | |-- Synchronization | |-- Mutual Exclusion | |-- Device Management | |-- I/O Buffering | |-- Device Controllers | |-- Interrupt Handling | |-- DMA (Direct Memory Access) | |-- User Interface | |-- Graphical User Interface (GUI) | |-- Command Line Interface (CLI) | |-- Windowing Systems | |-- Shell | |-- Command Interpreter | |-- Scripting | |-- Job Control | |-- System Utilities | |-- Task Manager | |-- Disk Cleanup | |-- System Monitor | |-- Backup and Restore | |-- Boot Process | |-- BIOS/UEFI | |-- Boot Loader | |-- Kernel Initialization | |-- Init Process | |-- System Libraries | |-- Standard C Library | |-- POSIX Library | |-- WinAPI (for Windows) | |-- System Calls | |-- File System Calls | |-- Process Control Calls | |-- Memory Management Calls | |-- Communication Calls | |-- Error Handling | |-- Error Codes | |-- Logging | |-- Recovery Strategies | |-- Distributed Systems | |-- Clustering | |-- Load Balancing | |-- Distributed File Systems | |-- Cloud Computing | |-- Virtualization | |-- Infrastructure as a Service (IaaS) | |-- Platform as a Service (PaaS) | |-- Software as a Service (SaaS) | └-- Comments |-- // Single-line comment └-- /* Multi-line comment */

100+ Practice Questions ❍ C/C++ ❍ Python ❍ JavaScript ❍ Java ❍ C# ❍ Golang ➊ Simple Numbers ➀ Find a digit at a specific place in a number ➁ Find count of digits in a number ➂ Find the largest digit ➃ Find the 2nd largest digit ➄ Find the kth largest digit ➅ Find the smallest digit ➆ Find the 2nd smallest digit ➇ Find the kth smallest digit ➈ Find generic root (sum of all digits) of a number ➉ Reverse the digits in a number ➀➀ Rotate the digits in a number ➀➁ Is the number a palindrome? ➀➂ Find sum of 'n' numbers ➀➃ Check if a number is perfect square ➀➄ Find a number in an AP sequence ➀➅ Find a number in a GP sequence ➀➆ Find a number in fibonacci sequence ➀➇ Check number divisibility by 2, 3, 5, 9 ➀➈ Check if a number is primary or not 20. Given a number, print all primes smaller than it ➁➀ Check if a number is circular prime or not ➁➁ Find all prime factors of a number ➁➂ Find the GCD of 2 numbers ➁➃ Find the LCM of 2 numbers ➁➄ Find the factorial of a number ➁➅ Find the exponentiation of a number ➋ Unit Conversion ➀ Number Base (Binary, Octal, Hexadecimal, Decimal) ➁ Weight (gram, kg, pound) ➂ Height (cm, m, inch, feet) ➃ Temperature (centigrade, fahrenhite) ➄ Distance (km, mile) ➅ Area (m², km², acre) ➆ Volume (ltr, gallon) ➇ Time (sec, min, hour) ➈ Currency ➌ Calculator ➀ Loan EMI Calculator ➁ Fixed Deposit Returns Calculator ➂ Interest Calculator ➃ BMI Calculator ➄ Item Price (considering tax, discount, shipping) ➅ Tip Calculator ➍ Geometry ➀ Find distance between 2 points ➁ Given 2 sides of a right angle triangle, find the 3rd ➂ Find 3rd angle of a triangle when 2 are given ➃ Area of a triangle when 3 sides are given ➄ Area of a right angle triangle ➅ Perimeter of a Square ➆ Area of a Square ➇ Perimeter of a Rectangle ➈ Area of a Rectangle ➉ Circumference of a Circle ➀➀ Area of a Circle ➀➁ Circumference of a Semi-Circle ➀➂ Area of a Semi-Circle ➀➃ Area of a Ring ➀➄ Circumference of an Ellipse ➀➅ Area of an Ellipse ➀➆ Suface Area of a Sphere ➀➇ Volume of a Sphere ➀➈ Surface Area of a Hemisphere 20. Volume of a Hemisphere ➁➀ Surface area of a Cube ➁➁ Volume of a Cube ➁➂ Surface area of a Cylinder ➁➃ Volume of a Cylinder ➎ Vector ➀ Find Scalar Multiplication of a vector ➁ Find addition/subtraction of vectors ➂ Find magnitude of a vector ➃ Find an unit vector along a given vector ➄ Find dot product of 2 vectors ➅ Find cross product of 2 vectors ➆ Check if 2 vectors are orthogonal ➏ Matrix ➀ Find the determinant of a matrix ➁ Find Scalar Multiplication of a matrix ➂ Find addition/subtraction of matrices ➃ Find the transpose of a matrix ➄ Find if 2 matrices are orthogonal ➅ Find inverse of a 2x2 and 3x3 matrix ➐ Set ➀ Find Union of 2 sets ➁ Find Intersection of 2 sets ➂ Find the Difference of 2 sets ➃ Find the Symmetric Difference of 2 sets ➄ Find if a set is subset/superset of another set ➅ Find if 2 sets are disjoints ➑ Special Numbers ➀ Strong Number ➁ Perfect Number ➂ Armstrong Number ➃ Harshad Number ➄ Kaprekar Number ➅ Lychrel Number ➆ Narcissistic Decimal Number ➇ Lucus Number ➈ Catalan Number ➉ Duck Number ➀➀ Ugly Number ➀➁ Abundant Number ➀➂ Deficient Number ➀➃ Automorphic Number ➀➄ Magic Number ➀➅ Friendly Pair Numbers ➀➆ Neon Number ➀➇ Spy Number ➀➈ Happy Number 20. Sunny Number ➁➀ Disarium Number ➁➁ Pronic Number ➁➂ Trimorphic Number ➁➃ Evil Number ➁➄ Amicable Pairs ⬘ If you want to excel in programming, practice a lot. Join for more: https://t.me/programming_guide ⬙ Problems based on numbers are easy to start with and they help in improving your analytical skills.

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How to Learn Java in 2024 1. Set Clear Goals:    - Define your learning objectives. Do you want to build web applications, mobile apps, or work on enterprise-level software? 2. Choose a Structured Learning Path:    - Follow a structured learning path that covers the fundamentals of Java, object-oriented programming principles, and essential libraries. 3. Start with the Basics:    - Begin with the core concepts of Java, such as variables, data types, operators, and control flow statements. 4. Master Object-Oriented Programming:    - Learn about classes, objects, inheritance, polymorphism, and encapsulation. 5. Explore Java Libraries:    - Familiarize yourself with commonly used Java libraries, such as those for input/output, networking, and data structures. 6. Practice Regularly:    - Write code regularly to reinforce your understanding and identify areas where you need more practice. 7. Leverage Online Resources:    - Utilize online courses, tutorials, and documentation to supplement your learning. 8. Join a Coding Community:    - Engage with online coding communities and forums to ask questions, share knowledge, and collaborate on projects. 9. Build Projects:    - Create simple projects to apply your skills and gain practical experience. 10. Stay Updated with Java Releases:     - Keep up with the latest Java releases and updates to ensure your knowledge remains current. 11. Explore Frameworks and Tools:     - Learn about popular Java frameworks and tools, such as Spring Boot, Maven, and IntelliJ IDEA. 12. Contribute to Open Source Projects:     - Contribute to open source Java projects to gain real-world experience and showcase your skills. 13. Seek Feedback and Mentoring:     - Seek feedback from experienced Java developers and consider mentorship opportunities to accelerate your learning. 14. Prepare for Certifications:     - Consider pursuing Java certifications, such as the Oracle Certified Java Programmer (OCJP), to validate your skills. 15. Network with Java Developers:     - Attend Java meetups, conferences, and online events to connect with other Java developers and learn from their experiences.

System Design Cheat Sheet

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JavaScript, TypeScript, Python, Java, Go, Ruby, Rust, Ook!, PHP, or whatever else... A programming language doesn't matter as long as it gets the job done. Period.

Coding is 30% typing, 70% understanding why what you typed doesn't work.

Common Programming Interview Questions How do you reverse a string? How do you determine if a string is a palindrome? How do you calculate the number of numerical digits in a string? How do you find the count for the occurrence of a particular character in a string? How do you find the non-matching characters in a string? How do you find out if the two given strings are anagrams? How do you calculate the number of vowels and consonants in a string? How do you total all of the matching integer elements in an array? How do you reverse an array? How do you find the maximum element in an array? How do you sort an array of integers in ascending order? How do you print a Fibonacci sequence using recursion? How do you calculate the sum of two integers? How do you find the average of numbers in a list? How do you check if an integer is even or odd? How do you find the middle element of a linked list? How do you remove a loop in a linked list? How do you merge two sorted linked lists? How do you implement binary search to find an element in a sorted array? How do you print a binary tree in vertical order? Conceptual Coding Interview Questions What is a data structure? What is an array? What is a linked list? What is the difference between an array and a linked list? What is LIFO? What is FIFO? What is a stack? What are binary trees? What are binary search trees? What is object-oriented programming? What is the purpose of a loop in programming? What is a conditional statement? What is debugging? What is recursion? What are the differences between linear and non-linear data structures? General Coding Interview Questions What programming languages do you have experience working with? Describe a time you faced a challenge in a project you were working on and how you overcame it. Walk me through a project you’re currently or have recently worked on. Give an example of a project you worked on where you had to learn a new programming language or technology. How did you go about learning it? How do you ensure your code is readable by other developers? What are your interests outside of programming? How do you keep your skills sharp and up to date? How do you collaborate on projects with non-technical team members? Tell me about a time when you had to explain a complex technical concept to a non-technical team member. How do you get started on a new coding project?

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Software Engineering 101: 1. Understand the requirements 2. Look for existing solutions 3. Talk to your peers 4. Design your own solution 5. Incorporate the existing solutions into your design 6. Now you can start to code Software engineering is more than only coding.