Some HackerRank solutions

Warning
THIS IS MORE LIKE PERSONAL ENGINEER-DEVELOPER NOTEBOOK RATHER THAN REPO WITH BEST-AND-OPTIMAL SOLUTIONS!
Created this to track and motivate myself to "keep in programming shape".
Problem description might be under the circle (C and C++) or name, followed by link to my solution. Some solutions "might" look ancient because some problems provide part of code to work with.
🟢 Easy 🟠 Medium 🔴 Hard

Problem Solving

Algorithms

1. Warmup ✅

   • 🟢 Solve Me First - C++
   • 🟢 Simple Array Sum - C++
   • 🟢 Compare the Triplets - C++
   • 🟢 A Very Big Sum - C++
   • 🟢 Diagonal Difference - C++
   • 🟢 Plus Minus - C++
   • 🟢 Staircase - C++
   • 🟢 Mini-Max Sum - C++
   • 🟢 Birthday Cake Candles - C++
   • 🟢 Time Conversion - C++

2. Implementation

   • 🟢 Grading Students - C++
   • 🟢 Apple and Orange - C++
   • 🟢 Number Line Jumps - C++
   • 🟢 Breaking the Records - C++
   • 🟢 Subarray Division - C++
   • 🟢 Bill Division - C++
   • 🟢 Sales by Match - C++

3. Strings

4. Sorting

   • 🟢 Big Sorting - C++
   • 🟢 tutorial-intro - C++

5. Search

6. Graph Theory

7. Greedy

8. Dynamic Programming

9. Constructive Algorithms

10. Bit Manipulation

11. Recursion

12. Game Theory

13. NP Complete

14. Debugging

Data Structures

1. Arrays ✅
   • 🟢 Arrays - DS - C++
   • 🟢 2D Array - DS - C++
   • 🟢 Dynamic Array - C++
   • 🟢 Left Rotation - C++
   • 🟠 Sparse Arrays - C++
   • 🔴 Array Manipulation - C++
2. Linked Lists
   • 🟢 Print the Elements of a Linked List - C++
   • 🟢 Insert a node at the tail of a Linked List - C++
   • 🟢 Insert a node at the head of a linked list - C++
   • 🟢 Insert a node at a specific position in a linked list - C++
   • 🟢 Delete a Node - C++
   • 🟢 Print in Reverse - C++
   • 🟢 Reverse a linked list - C++
   • 🟢 Compare two linked lists - C++
   • 🟢 Get Node Value - C++
   • 🟢 Delete duplicate-value nodes from a sorted linked list - C++
   • 🟢 Inserting a Node Into a Sorted Doubly Linked List - C++
   • 🟢 Reverse a doubly linked list - C++
3. Trees
   • 🟢 Tree: Preorder Traversal - C++
   • 🟢 Tree: Postorder Traversal - C++
   • 🟢 Tree: Inorder Traversal - C++
   • 🟢 Tree: Height of a Binary Tree - C++

C++

1. Introduction ✅
   • 🟢 Say "Hello, World!" With C++
   • 🟢 Input and Output
   • 🟢 Basic Data Types
   • 🟢 Conditional Statements
   • 🟢 For Loop
   • 🟢 Functions
   • 🟢 Pointer
   • 🟢 Arrays Introduction
   • 🟢 Variable Sized Arrays
2. Strings
   • 🟢 StringStream
   • 🟢 Strings
   • 🚧 🟢 Attribute Parser 🚧
3. Classes ✅
   • 🟢 Structs
   • 🟢 Class
   • 🟢 Classes and Objects
   • 🟢 Box It!
   • 🟠 Inherited Code
   • 🟠 Exceptional Server
   • 🟠 Virtual Functions
   • 🔴 Abstract Classes - Polymorphism
4. STL ✅
   • 🟢 Vector-Sort
   • 🟢 Vector-Erase
   • 🟢 Lower Bound-STL
   • 🟢 Sets-STL
   • 🟢 Maps-STL
   • 🟢 Print Pretty
   • 🟠 Deque-STL optimum sliding window algorithm
5. Inheritance ✅
   • 🟢 Inheritance Introduction
   • 🟢 Rectangle Area
   • 🟢 Multi Level Inheritance
   • 🟠 Accessing Inherited Functions
   • 🔴 Magic Spells Longest Common Subsequence algorithm (dynamic_cast in original problem)
6. Debugging ✅
   • 🟠 Hotel Prices
   • 🟠 Cpp exception handling
   • 🟠 Overloading Ostream Operator
   • 🟠 Messages Order
7. Other Concepts ✅
   • 🟢 C++ Class Templates
   • 🟢 Preprocessor Solution
   • 🟠 Operator Overloading
   • 🟢 Overload Operators
   • 🟠 Attending Workshops
   • 🟠 C++ Class Template Specialization
   • 🔴 C++ Variadics Variadics and range based loop
   • 🔴 Bit Array poorly described cycle detection...

Python

1. Introduction ✅
   • [:green_circle:] Say "Hello, World!" With Python
   • [:green_circle:] Python If-Else
   • [:green_circle:] Arithmetic Operators
   • [:green_circle:] Python: Division
   • [:green_circle:] Loops
   • [:orange_circle:] Write a function
   • [:green_circle:] Print Function

C

1. Introduction ✅
   • 🟢 "Hello World!" in C
   • 🟢 Playing With Characters
   • 🟢 Sum and Difference of Two Numbers
   • 🟢 Functions in C
   • 🟢 Pointers in C
2. Conditionals and Loops
   • 🟢 Conditional Statements in C
   • 🟢 For Loop in C
   • 🟢 Sum of Digits of a Five Digit Number
   • 🟢 Bitwise Operators
3. Arrays and Strings ✅
   • 🟠 1D Arrays in C
   • 🟠 Array Reversal
   • 🟠 Printing Tokens
   • 🟠 Digit Frequency
   • 🟠 Dynamic Array in C
4. Functions
   • 🟢 Calculate the Nth term
   • 🟢 Students Marks Sum
   • 🟠 Variadic functions in C
5. Structs and Enums
   • 🟢 Boxes through a Tunnel
   • 🟠 Small Triangles, Large Triangles

Linux Shell

1. Bash
   • 🟢 Let's Echo
   • 🟢 Looping and Skipping
   • 🟢 A Personalized Echo
   • 🟢 Looping with Numbers for loop with range
   • 🟢 The World of Numbers arithmetic expansion
   • 🟢 Comparing Numbers if elseif else
   • 🟢 Getting started with conditionals
   • 🟢 More on Conditionals
   • 🟢 Arithmetic Operations printf and bc -l
   • 🟢 Compute the Average for loop like C++