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 ✅

   • 🟢 1x🍒Solve Me First - C++
   • 🟢 10x🍒 Simple Array Sum - C++
   • 🟢 10x🍒 Compare the Triplets - C++
   • 🟢 10x🍒 A Very Big Sum - C++
   • 🟢 10x🍒 Diagonal Difference - C++
   • 🟢 10x🍒 Plus Minus - C++
   • 🟢 10x🍒 Staircase - C++
   • 🟢 10x🍒 Mini-Max Sum - C++
   • 🟢 10x🍒 Birthday Cake Candles - C++
   • 🟢 15x🍒 Time Conversion - C++

2. Implementation

   • 🟢 10x🍒 Grading Students - C++
   • 🟢 10x🍒 Apple and Orange - C++
   • 🟢 10x🍒 Number Line Jumps - C++
   • 🟢 10x🍒 Breaking the Records - C++
   • 🟢 10x🍒 Subarray Division - C++
   • 🟢 10x🍒 Bill Division - C++
   • 🟢 10x🍒 Sales by Match - C++

3. Strings

4. Sorting

   • 🟢 15x🍒 Big Sorting - C++
   • 🟢 15x🍒 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 ✅
   • 🟢 10x🍒 Arrays - DS - C++
   • 🟢 15x🍒 2D Array - DS - C++
   • 🟢 15x🍒 Dynamic Array - C++
   • 🟢 20x🍒 Left Rotation - C++
   • 🟠 25x🍒 Sparse Arrays - C++
   • 🔴 60x🍒 Array Manipulation - C++
2. Linked Lists
   • 🟢 5x🍒 Print the Elements of a Linked List - C++
   • 🟢 5x🍒 Insert a node at the tail of a Linked List - C++
   • 🟢 5x🍒 Insert a node at the head of a linked list - C++
   • 🟢 5x🍒 Insert a node at a specific position in a linked list - C++
   • 🟢 5x🍒 Delete a Node - C++
   • 🟢 5x🍒 Print in Reverse - C++
   • 🟢 5x🍒 Reverse a linked list - C++
   • 🟢 5x🍒 Compare two linked lists - C++
   • 🟢 5x🍒 Get Node Value - C++
   • 🟢 5x🍒 Delete duplicate-value nodes from a sorted linked list - C++
   • 🟢 5x🍒 Inserting a Node Into a Sorted Doubly Linked List - C++
   • 🟢 5x🍒 Reverse a doubly linked list - C++
3. Trees
   • 🟢 10x🍒 Tree: Preorder Traversal - C++
   • 🟢 10x🍒 Tree: Postorder Traversal - C++
   • 🟢 10x🍒 Tree: Inorder Traversal - C++
   • 🟢 10x🍒 Tree: Height of a Binary Tree - C++

C++

1. Introduction ✅
   • 🟢 5x:cherries: Say "Hello, World!" With C++
   • 🟢 5x:cherries: Input and Output
   • 🟢 10x:cherries: Basic Data Types
   • 🟢 10x:cherries: Conditional Statements
   • 🟢 10x:cherries: For Loop
   • 🟢 10x:cherries: Functions
   • 🟢 10x:cherries: Pointer
   • 🟢 10x:cherries: Arrays Introduction
   • 🟢 30x:cherries: Variable Sized Arrays
2. Strings
   • 🟢 10x:cherries: StringStream
   • 🟢 10x:cherries: Strings
   • 🚧 🟢 10x:cherries: Attribute Parser 🚧
3. Classes ✅
   • 🟢 10x:cherries: Structs
   • 🟢 10x:cherries: Class
   • 🟢 20x:cherries: Classes and Objects
   • 🟢 30x:cherries: Box It!
   • 🟠 30x:cherries: Inherited Code
   • 🟠 30x:cherries: Exceptional Server
   • 🟠 40x:cherries: Virtual Functions
   • 🔴 60x:cherries: Abstract Classes - Polymorphism
4. STL ✅
   • 🟢 10x:cherries: Vector-Sort
   • 🟢 10x:cherries: Vector-Erase
   • 🟢 15x:cherries: Lower Bound-STL
   • 🟢 15x:cherries: Sets-STL
   • 🟢 15x:cherries: Maps-STL
   • 🟢 20x:cherries: Print Pretty
   • 🟠 50x:cherries: Deque-STL optimum sliding window algorithm
5. Inheritance ✅
   • 🟢 20x:cherries: Inheritance Introduction
   • 🟢 25x:cherries: Rectangle Area
   • 🟢 25x:cherries: Multi Level Inheritance
   • 🟠 30x:cherries: Accessing Inherited Functions
   • 🔴 40x:cherries: Magic Spells Longest Common Subsequence algorithm (dynamic_cast in original problem)
6. Debugging ✅
   • 🟠 15x:cherries: Hotel Prices
   • 🟠 20x:cherries: Cpp exception handling
   • 🟠 20x:cherries: Overloading Ostream Operator
   • 🟠 40x:cherries: Messages Order
7. Other Concepts ✅
   • 🟢 20x:cherries: C++ Class Templates
   • 🟢 25x:cherries: Preprocessor Solution
   • 🟠 25x:cherries: Operator Overloading
   • 🟢 30x:cherries: Overload Operators
   • 🟠 35x:cherries: Attending Workshops
   • 🟠 35x:cherries: C++ Class Template Specialization
   • 🔴 80x:cherries: C++ Variadics Variadics and range based loop
   • 🔴 80x:cherries: Bit Array poorly described cycle detection...

C

1. Introduction ✅
   • 🟢 5x:cherries: "Hello World!" in C
   • 🟢 5x:cherries: Playing With Characters
   • 🟢 5x:cherries: Sum and Difference of Two Numbers
   • 🟢 10x:cherries: Functions in C
   • 🟢 10x:cherries: Pointers in C
2. Conditionals and Loops
   • 🟢 10x:cherries: Conditional Statements in C
   • 🟢 10x:cherries: For Loop in C
   • 🟢 15x:cherries: Sum of Digits of a Five Digit Number
   • 🟢 15x:cherries: Bitwise Operators
3. Arrays and Strings ✅
   • 🟠 10x:cherries: 1D Arrays in C
   • 🟠 20x:cherries: Array Reversal
   • 🟠 20x:cherries: Printing Tokens
   • 🟠 25x:cherries: Digit Frequency
   • 🟠 40x:cherries: Dynamic Array in C
4. Functions
   • 🟢 15x:cherries: Calculate the Nth term
   • 🟢 20x:cherries: Students Marks Sum
   • 🟠 50x:cherries: Variadic functions in C
5. Structs and Enums
   • 🟢 25x:cherries: Boxes through a Tunnel
   • 🟠 30x:cherries: Small Triangles, Large Triangles

Linux Shell

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