HackerRank Challenge Solutions

01. Tutorials

01. 30 Days of Code

Number	Challenge	Solution	Difficulty	Score
01	Day 0: Hello, World.	java	Easy	30
02	Day 1: Data Types	java	Easy	30
03	Day 2: Operators	java	Easy	30
04	Day 3: Intro to Conditional Statements	java	Easy	30
05	Day 4: Class vs. Instance	java	Easy	30
06	Day 5: Loops	java	Easy	30
07	Day 6: Let's Review	java	Easy	30
08	Day 7: Arrays	java	Easy	30
09	Day 8: Dictionaries and Maps	java	Easy	30
10	Day 9: Recursion 3	java	Easy	30
11	Day 10: Binary Numbers	java	Easy	30
12	Day 11: 2D Arrays	java	Easy	30
13	Day 12: Inheritance	java	Easy	30
14	Day 13: Abstract Classes	java	Easy	30
15	Day 14: Scope	java	Easy	30
16	Day 15: Linked List	java	Easy	30
17	Day 16: Exceptions - String to Integer	java	Easy	30
18	Day 17: More Exceptions	java	Easy	30
19	Day 18: Queues and Stacks	java	Easy	30
20	Day 19: Interfaces	java	Easy	30
21	Day 20: Sorting	java	Easy	30
22	Day 21: Generics	java	Easy	30
23	Day 22: Binary Search Trees	java	Easy	30
24	Day 23: BST Level-Order Traversal	java	Easy	30
25	Day 24: More Linked Lists	java	Easy	30
26	Day 25: Running Time and Complexity	java	Medium	30
27	Day 26: Nested Logic	java	Easy	30
28	Day 27: Testing	java	Easy	30
29	Day 28: RegEx, Patterns, and Intro to Databases	java	Medium	30
30	Day 29: Bitwise AND	java	Medium	30

02. 10 Days of Statistics

Number	Challenge	Solution	Difficulty	Score
01	Day 0: Mean, Median, and Mode	py	Easy	30
02	Day 0: Weighted Mean	py	Easy	30
03	Day 1: Quartiles	py	Easy	30
04	Day 1: Interquartile Range	py	Easy	30
05	Day 1: Standard Deviation	py	Easy	30
06	Day 2: Basic Probability	py	Easy	10
07	Day 2: More Dice	py	Easy	10
08	Day 2: Compound Event Probability	py	Easy	10
09	Day 3: Conditional Probability	py	Easy	10
10	Day 3: Cards of the Same Suit	py	Easy	10
11	Day 3: Drawing Marbles	py	Easy	10
12	Day 4: Binomial Distribution I	py	Easy	30
13	Day 4: Binomial Distribution II	py	Easy	30
14	Day 4: Geometric Distribution I	py	Easy	30
15	Day 4: Geometric Distribution II	py	Easy	30
16	Day 5: Poisson Distribution I	py	Easy	30
17	Day 5: Poisson Distribution II	py	Easy	30
18	Day 5: Normal Distribution I	py	Easy	30
19	Day 5: Normal Distribution II	py	Easy	30
20	Day 6: The Central Limit Theorem I	py	Easy	30
21	Day 6: The Central Limit Theorem II	py	Easy	30
22	Day 6: The Central Limit Theorem III	py	Easy	30
23	Day 7: Pearson Correlation Coefficient I	py	Easy	30
24	Day 7: Spearman's Rank Correlation Coefficient	py	Easy	30
25	Day 8: Least Square Regression Line	py	Easy	30
26	Day 8: Pearson Correlation Coefficient II	py	Easy	10
27	Day 9: Multiple Linear Regression	py	Medium	30.00

03. 10 Days of Javascript

Number	Challenge	Solution	Difficulty	Score
01	Day 0: Hello, World!	js	Easy	10
02	Day 0: Data Types	js	Easy	10
03	Day 1: Arithmetic Operators	js	Easy	10
04	Day 1: Functions	js	Easy	10
05	Day 1: Let and Const	js	Easy	10
06	Day 2: Conditional Statements: If-Else	js	Easy	10
07	Day 2: Conditional Statements: Switch	js	Easy	10
08	Day 2: Loops	js	Easy	10
09	Day 3: Arrays	js	Easy	15
10	Day 3: Try, Catch, and Finally	js	Easy	15
11	Day 3: Throw	js	Easy	15
12	Day 4: Create a Rectangle Object	js	Easy	15
13	Day 4: Count Objects	js	Easy	15
14	Day 4: Classes	js	Easy	15
15	Day 5: Inheritance	js	Easy	15
16	Day 5: Template Literals	js	Easy	15
17	Day 5: Arrow Functions	js	Easy	15
18	Day 6: Bitwise Operators	js	Easy	15
19	Day 6: JavaScript Dates	js	Easy	15
20	Day 7: Regular Expressions I	js	Easy	15
21	Day 7: Regular Expressions II	js	Easy	15
22	Day 7: Regular Expressions III	js	Easy	15
23	Day 8: Create a Button	html	Easy	20
24	Day 8: Buttons Container	html	Easy	25
25	Day 9: Binary Calculator	html	Medium	30

02. Algorithms

01. Warmup

Number	Challenge	Solution	Difficulty	Score
01	Solve Me First	java	Easy	1
02	Simple Array Sum	java	Easy	10
03	Compare the Triplets	java	Easy	10
04	A Very Big Sum	java	Easy	10
05	Diagonal Difference	java	Easy	10
06	Plus Minus	java	Easy	10
07	Staircase	java	Easy	10
08	Mini-Max Sum	java	Easy	10
09	Birthday Cake Candles	java	Easy	10
10	Time Conversion	java	Easy	15

02. Implementation

Number	Challenge	Solution	Difficulty	Score
01	Grading Students	java	Easy	10
02	Apple and Orange	java	Easy	10
03	Number Line Jumps	java	Easy	10
04	Between Two Sets	java	Easy	10
05	Breaking the Records	java	Easy	10
06	Subarray Division	java	Easy	10
07	Divisible Sum Pairs	java	Easy	10
08	Migratory Birds	java	Easy	10
10	Sales by Match	py	Easy	10
12	Counting Valleys	py	Easy	15
35	Jumping on the Clouds	py	Easy	20
36	Repeated String	py	Easy	20

04. Sorting

Number	Challenge	Solution	Difficulty	Score
03	Insertion Sort - Part 1	java	Easy	30
04	Insertion Sort - Part 2	java	Easy	30

06. Graph Theory

Number	Challenge	Solution	Difficulty	Score
01	Roads and Libraries	java	Medium	30
05	Breadth First Search: Shortest Reach	java	Medium	55

09. Constructive Algorithms

Number	Challenge	Solution	Difficulty	Score
03	New Year Chaos	py	Medium	40

03. Data Structures

01. Arrays

Number	Challenge	Solution	Difficulty	Score
01	Arrays - DS	java	Easy	10
02	2D Array - DS	java	Easy	15
03	Dynamic Array	java	Easy	15
04	Left Rotation	java	Easy	20
05	Sparse Arrays	java	Medium	25
06	Array Manipulation	java	Hard	60

02. Linked Lists

Number	Challenge	Solution	Difficulty	Score
01	Print the Elements of a Linked List	java	Easy	5
02	Insert a Node at the Tail of a Linked List	java	Easy	5
03	Insert a node at the head of a linked list	java	Easy	5
04	Insert a node at a specific position in a linked list	java	Easy	5
05	Delete a Node	java	Easy	5
06	Print in Reverse	java	Easy	5
07	Reverse a linked list	java	Easy	5
08	Compare two linked lists	java	Easy	5
09	Merge two sorted linked lists	java	Easy	5
10	Get Node Value	java	Easy	5
11	Delete duplicate-value nodes from a sorted linked list	java	Easy	5
12	Cycle Detection	java	Medium	5
13	Find Merge Point of Two Lists	java	Easy	5
14	Inserting a Node Into a Sorted Doubly Linked List	java	Easy	5
15	Reverse a doubly linked list	java	Easy	5

03. Trees

Number	Challenge	Solution	Difficulty	Score
01	Tree: Preorder Traversal	java	Easy	10
02	Tree: Postorder Traversal	java	Easy	10
03	Tree: Inorder Traversal	java	Easy	10
04	Tree: Height of a Binary Tree	java	Easy	10
05	Tree: Level Order Traversal	java	Easy	20
06	Binary Search Tree : Insertion	java	Easy	20
08	Binary Search Tree : Lowest Common Ancestor	java	Easy	30

05. Stacks

Number	Challenge	Solution	Difficulty	Score
01	Balanced Brackets	java	Medium	25
02	Equal Stacks	java	Easy	25
06	Simple Text Editor	java	Medium	65

06. Queues

Number	Challenge	Solution	Difficulty	Score
01	Queue using Two Stacks	java	Medium	30

04. Mathemathics

01. Fundamentals

Number	Challenge	Solution	Difficulty	Score
01	Find the Point	py	Easy	5

05. Artificial Intelligence

01. Bot Building

Number	Challenge	Solution	Difficulty	Score
01	Bot saves princess	py	Easy	13
02	Bot saves princess - 2	py	Easy	17

06. C

01. Introduction

Number	Challenge	Solution	Difficulty	Score
01	"Hello World!" in C	c	Easy	5
02	Playing With Characters	c	Easy	5
03	Sum and Difference of Two Numbers	c	Easy	5
04	Functions in C	c	Easy	10
05	Pointers in C	c	Easy	10

02. Conditionals and Loops

Number	Challenge	Solution	Difficulty	Score
01	Conditional Statements in C	c	Easy	10
02	For Loop in C	c	Easy	10
03	Sum of Digits of a Five Digit Number	c	Easy	15
04	Bitwise Operators	c	Easy	15
05	Printing Pattern Using Loops	c	Medium	30

03. Arrays and Strings

Number	Challenge	Solution	Difficulty	Score
01	1D Arrays in C	c	Medium	10
02	Array Reversal	c	Medium	20
03	Printing Tokens	c	Medium	20
04	Digit Frequency	c	Medium	25
05	Dynamic Array in C	c	Medium	40

04. Functions

Number	Challenge	Solution	Difficulty	Score
01	Calculate the Nth term	c	Easy	15
02	Students Marks Sum	c	Easy	20
03	Sorting Array of Strings	c	Hard	40
04	Permutations of Strings	c	Medium	40
05	Variadic functions in C	c	Medium	50
06	Querying the Document	c	Hard	60

05. Structs and Enums

Number	Challenge	Solution	Difficulty	Score
01	Boxes through a Tunnel	c	Easy	25
02	Small Triangles, Large Triangles	c	Medium	30

07. C++

01. Introduction

Number	Challenge	Solution	Difficulty	Score
01	Say "Hello, World!" With C++	cpp	Easy	5
02	Input and Output	cpp	Easy	5
03	Basic Data Types	cpp	Easy	10
04	Conditional Statements	cpp	Easy	10
05	For Loop	cpp	Easy	10
06	Pointer	cpp	Easy	10
07	Arrays Introduction	cpp	Easy	10
08	Variable Sized Arrays	cpp	Easy	30

02. Strings

Number	Challenge	Solution	Difficulty	Score
01	Attribute Parser	cpp	Medium	35
02	StringStream	cpp	Easy	10
03	Strings	cpp	Easy	10

03. Classes

Number	Challenge	Solution	Difficulty	Score
01	Structs	cpp	Easy	10
02	Class	cpp	Easy	10
03	Classes and Objects	cpp	Easy	20
04	Box It!	cpp	Easy	30
05	Inherited Code	cpp	Medium	30

08. Java

01. Introduction

Number	Challenge	Solution	Difficulty	Score
01	Welcome to Java!	java	Easy	3
02	Java Stdin and Stdout I	java	Easy	5
03	Java If-Else	java	Easy	10
04	Java Stdin and Stdout II	java	Easy	10
05	Java Output Formatting	java	Easy	10
06	Java Loops I	java	Easy	10
08	Java Loops II	java	Easy	10
09	Java Datatypes	java	Easy	10
10	Java End-of-file	java	Easy	10
11	Java Static Initializer Block	java	Easy	10
12	Java Int to String	java	Easy	10
13	Java Date and Time	java	Easy	15
14	Java Currency Formatter	java	Easy	15

02. Strings

Number	Challenge	Solution	Difficulty	Score
01	Java Strings Introduction	java	Easy	5
02	Java Substring	java	Easy	5
03	Java Substring Comparisons	java	Easy	10
04	Java String Reverse	java	Easy	10
05	Java Anagrams	java	Easy	10
06	Java String Tokens	java	Easy	15
07	Pattern Syntax Checker	java	Easy	20
08	Java Regex	java	Medium	25
09	Java Regex 2 - Duplicate Words	java	Medium	12.50

09. Python

01. Introduction

Number	Challenge	Solution	Difficulty	Score
01	Say "Hello, World!" With Python	py	Easy	5
02	Python If-Else	py	Easy	10
03	Arithmetic Operators	py	Easy	10
04	Python: Division	py	Easy	10
05	Loops	py	Easy	10
06	Write a function	py	Medium	10
07	Print Function	py	Easy	20

02. Basic Data Types

Number	Challenge	Solution	Difficulty	Score
01	List Comprehensions	py	Easy	10
02	Find the Runner-Up Score!	py	Easy	10
03	Nested Lists	py	Easy	10
04	Finding the percentage	py	Easy	10
05	Lists	py	Easy	10
06	Tuples	py	Easy	10

03. Strings

Number	Challenge	Solution	Difficulty	Score
01	sWAP cASE	py	Easy	10
02	String Split and Join	py	Easy	10
03	What's Your Name?	py	Easy	10
04	Mutations	py	Easy	10
05	Find a string	py	Easy	10
06	String Validators	py	Easy	10
07	Text Alignment	py	Easy	10
08	Text Wrap	py	Easy	10
09	Designer Door Mat	py	Easy	10
10	String Formatting	py	Easy	10
11	Alphabet Rangoli	py	Easy	20
12	Capitalize!	py	Easy	20

04. Sets

Number	Challenge	Solution	Difficulty	Score
01	Introduction to Sets	py	Easy	10
02	No Idea!	py	Medium	50
03	Symmetric Difference	py	Easy	10
04	Set .add()	py	Easy	10
05	Set .discard(), .remove() & .pop()	py	Easy	10
06	Set .union() Operation	py	Easy	10
07	Set .intersection() Operation	py	Easy	10
08	Set .difference() Operation	py	Easy	10
09	Set .symmetric_difference() Operation	py	Easy	10
10	Set Mutations	py	Easy	10
11	The Captain's Room	py	Easy	10
12	Check Subset	py	Easy	10
13	Check Strict Superset	py	Easy	10

05. Math

Number	Challenge	Solution	Difficulty	Score
01	Polar Coordinates	py	Easy	10

10. Ruby

01. Introduction

Number	Challenge	Solution	Difficulty	Score
01	Ruby Tutorial - Hello HackerRank!	rb	Easy	5
02	Ruby Tutorial - Everything is an Object	rb	Easy	10
03	Ruby Tutorial - Object Methods	rb	Easy	10
04	Ruby Tutorial - Object Method Parameters	rb	Easy	10

02. Control Structures

Number	Challenge	Solution	Difficulty	Score
01	Ruby Control Structures - Each	rb	Easy	10
02	Ruby Control Structures - Unless	rb	Easy	10
03	Ruby Control Structures - Infinite Loop	rb	Easy	10
04	Ruby Control Structures - Until	rb	Easy	10
05	Ruby Control Structures - Case (Bonus Question)	rb	Medium	20

03. Arrays & Hashes

Number	Challenge	Solution	Difficulty	Score
01	Ruby Array - Initialization	rb	Easy	10
02	Ruby Array - Index, Part 1	rb	Easy	10
03	Ruby Array - Index, Part 2	rb	Easy	10
04	Ruby Array - Addition	rb	Easy	10
05	Ruby Array - Deletion	rb	Easy	10
06	Ruby Array - Selection	rb	Easy	10
07	Ruby Hash - Initialization	rb	Easy	10
08	Ruby Hash - Each	rb	Easy	10
09	Ruby Hash - Addition, Deletion, Selection	rb	Easy	10

04. Enumerables

Number	Challenge	Solution	Difficulty	Score
01	Ruby - Enumerable - Introduction	rb	Medium	10
02	Ruby - Enumerable - each_with_index	rb	Medium	10
03	Ruby - Enumerable - collect	rb	Medium	10
04	Ruby - Enumerable - reduce	rb	Medium	10
05	Ruby Enumerables: 'any', 'all', 'none', and 'find'	rb	Medium	15
06	Ruby - Enumerable - group_by	rb	Medium	15

05. Methods

Number	Challenge	Solution	Difficulty	Score
01	Ruby - Methods - Introduction	rb	Easy	10
02	Ruby - Methods - Arguments	rb	Medium	15
03	Ruby - Methods - Variable Arguments	rb	Easy	15
04	Ruby - Methods - Keyword Arguments	rb	Medium	20
05	Blocks	rb	Easy	30
06	Procs	rb	Easy	30
07	Lambdas	rb	Easy	30
08	Closures	rb	Easy	30
09	Partial Applications	rb	Easy	30
10	Currying	rb	Easy	30
11	Lazy Evaluation	rb	Medium	30

06. Strings

Number	Challenge	Solution	Difficulty	Score
01	Ruby - Strings - Introduction	rb	Easy	10
02	Ruby - Strings - Encoding	rb	Easy	15
03	Ruby - Strings - Indexing	rb	Easy	15
04	Ruby - Strings - Iteration	rb	Easy	15
05	Ruby - Strings - Methods I	rb	Easy	15
06	Ruby - Strings - Methods II	rb	Easy	15

11. SQL

01. Basic Select

Number	Challenge	Solution	Difficulty	Score
01	Revising the Select Query I	sql	Easy	10
02	Revising the Select Query II	sql	Easy	10
03	Select All	sql	Easy	10
04	Select By ID	sql	Easy	10
05	Japanese Cities' Attributes	sql	Easy	10
06	Japanese Cities' Names	sql	Easy	10
07	Weather Observation Station 1	sql	Easy	15
08	Weather Observation Station 3	sql	Easy	10
09	Weather Observation Station 4	sql	Easy	10
10	Weather Observation Station 5	sql	Easy	30
11	Weather Observation Station 6	sql	Easy	10
12	Weather Observation Station 7	sql	Easy	10
13	Weather Observation Station 8	sql	Easy	15
14	Weather Observation Station 9	sql	Easy	10
15	Weather Observation Station 10	sql	Easy	10
16	Weather Observation Station 11	sql	Easy	15
17	Weather Observation Station 12	sql	Easy	15
18	Higher Than 75 Marks	sql	Easy	15
19	Employee Names	sql	Easy	10
20	Employee Salaries	sql	Easy	10

02. Advanced Select

Number	Challenge	Solution	Difficulty	Score
01	Type of Triangle	sql	Easy	20
02	The PADS	sql	Medium	30
03	Occupations	sql	Medium	30
04	Binary Tree Nodes	sql	Medium	30
05	New Companies	sql	Medium	30

03. Aggregation

Number	Challenge	Solution	Difficulty	Score
01	Revising Aggregations - The Count Function	sql	Easy	10
02	Revising Aggregations - The Sum Function	sql	Easy	10
03	Revising Aggregations - Averages	sql	Easy	10
04	Average Population	sql	Easy	10
05	Japan Population	sql	Easy	10
06	Population Density Difference	sql	Easy	10
07	The Blunder	sql	Easy	15
08	Top Earners	sql	Easy	20
09	Weather Observation Station 2	sql	Easy	15
10	Weather Observation Station 13	sql	Easy	10
11	Weather Observation Station 14	sql	Easy	10
12	Weather Observation Station 15	sql	Easy	15
13	Weather Observation Station 16	sql	Easy	10
14	Weather Observation Station 17	sql	Easy	15
15	Weather Observation Station 18	sql	Medium	25
16	Weather Observation Station 19	sql	Medium	30
17	Weather Observation Station 20	sql	Medium	40

12. Databases

01. Relational Algebra

Number	Challenge	Solution	Difficulty	Score
01	Basics of Sets and Relations #1	txt	Easy	5
02	Basics of Sets and Relations #2	txt	Easy	5
03	Basics of Sets and Relations #3	txt	Easy	5
04	Basics of Sets and Relations #4	txt	Easy	5
05	Basics of Sets and Relations #5	txt	Easy	5
06	Basics of Sets and Relations #6	txt	Easy	5
07	Basics of Sets and Relations #7	txt	Easy	5
08	Relational Algebra - 3	txt	Easy	10
09	Relational Algebra - 4	txt	Easy	10
10	Database Query Languages	txt	Easy	10
11	Procedural Language	txt	Easy	10
12	Relations - 1	txt	Easy	10
13	Relations - 2	txt	Easy	10

13. Distributed Systems

01. Multiple Choice

Number	Challenge	Solution	Difficulty	Score
01	RPC - 1	txt	Easy	10
02	RPC - 2	txt	Easy	10

14. Linux Shell

01. Bash

Number	Challenge	Solution	Difficulty	Score
01	Let's Echo	sh	Easy	1

15. Functional Programming

01. Introduction

Number	Challenge	Solution	Difficulty	Score
01	Solve Me First FP	hs	Easy	3
02	Hello World	hs	Easy	5
03	Hello World N Times	hs	Easy	5

16. Regex

01. Introduction

Number	Challenge	Solution	Difficulty	Score
01	Matching Specific String	py	Easy	5
02	Matching Anything But a Newline	py	Easy	5
03	Matching Digits & Non-Digit Characters	py	Easy	5
04	Matching Whitespace & Non-Whitespace Character	py	Easy	5
05	Matching Word & Non-Word Character	py	Easy	5
06	Matching Start & End	py	Easy	5

17. Security

01. Functions

Number	Challenge	Solution	Difficulty	Score
01	Security Functions	py	Easy	5

18. Interview Preparation Kit

01. Warm-up Challenges

Number	Challenge	Solution	Difficulty	Score
01	Sales by Match	py	Easy	10
02	Counting Valleys	py	Easy	15
03	Jumping on the Clouds	py	Easy	20
04	Repeated String	py	Easy	20

02. Arrays

Number	Challenge	Solution	Difficulty	Score
01	2D Array - DS	java	Easy	15
02	Arrays: Left Rotation	java	Easy	20
03	New Year Chaos	py	Medium	40
04	Minimum Swaps 2	py	Medium	40
05	Array Manipulation	java	Hard	60

09. Stacks and Queues

Number	Challenge	Solution	Difficulty	Score
01	Balanced Brackets	java	Medium	25

10. Graphs

Number	Challenge	Solution	Difficulty	Score
01	Roads and Libraries	java	Medium	30

11. Trees

Number	Challenge	Solution	Difficulty	Score
01	Tree: Height of a Binary Tree	java	Easy	10
02	Binary Search Tree : Lowest Common Ancestor	java	Easy	30

12. Linked Lists

Number	Challenge	Solution	Difficulty	Score
01	Insert a node at a specific position in a linked list	java	Easy	5
02	Inserting a Node Into a Sorted Doubly Linked List	java	Easy	5
03	Reverse a doubly linked list	java	Easy	5
04	Find Merge Point of Two Lists	java	Easy	5
05	Linked Lists: Detect a Cycle	java	Easy	25

19. Contests

01. ProjectEuler+

Number	Challenge	Solution	Difficulty	Score
001	Project Euler #1: Multiples of 3 and 5	py	Easy	100

Name		Name	Last commit message	Last commit date
Latest commit History 18 Commits
01. Tutorials		01. Tutorials
02. Algorithms		02. Algorithms
03. Data Structures		03. Data Structures
04. Mathemathics/01. Fundamentals		04. Mathemathics/01. Fundamentals
05. Artificial Intelligence/01. Bot Building		05. Artificial Intelligence/01. Bot Building
06. C		06. C
07. C++		07. C++
08. Java		08. Java
09. Python		09. Python
10. Ruby		10. Ruby
11. SQL		11. SQL
12. Databases/01. Relational Algebra		12. Databases/01. Relational Algebra
13. Distributed Systems/01. Multiple Choice		13. Distributed Systems/01. Multiple Choice
14. Linux Shell/01. Bash		14. Linux Shell/01. Bash
15. Functional Programming/01. Introduction		15. Functional Programming/01. Introduction
16. Regex/01. Introduction		16. Regex/01. Introduction
17. Security/01. Functions		17. Security/01. Functions
18. Interview Preparation Kit		18. Interview Preparation Kit
19. Contests/01. ProjectEuler+		19. Contests/01. ProjectEuler+
.gitignore		.gitignore
LICENSE		LICENSE
README.md		README.md
readme.py		readme.py

License

juletx/HackerRank

Folders and files

Latest commit

History

Repository files navigation

HackerRank Challenge Solutions

01. Tutorials

01. 30 Days of Code

02. 10 Days of Statistics

03. 10 Days of Javascript

02. Algorithms

01. Warmup

02. Implementation

04. Sorting

06. Graph Theory

09. Constructive Algorithms

03. Data Structures

01. Arrays

02. Linked Lists

03. Trees

05. Stacks

06. Queues

04. Mathemathics

01. Fundamentals

05. Artificial Intelligence

01. Bot Building

06. C

01. Introduction

02. Conditionals and Loops

03. Arrays and Strings

04. Functions

05. Structs and Enums

07. C++

01. Introduction

02. Strings

03. Classes

08. Java

01. Introduction

02. Strings

09. Python

01. Introduction

02. Basic Data Types

03. Strings

04. Sets

05. Math

10. Ruby

01. Introduction

02. Control Structures

03. Arrays & Hashes

04. Enumerables

05. Methods

06. Strings

11. SQL

01. Basic Select

02. Advanced Select

03. Aggregation

12. Databases

01. Relational Algebra

13. Distributed Systems

01. Multiple Choice

14. Linux Shell

01. Bash

15. Functional Programming

01. Introduction

16. Regex

01. Introduction

17. Security

01. Functions

18. Interview Preparation Kit

01. Warm-up Challenges

02. Arrays

09. Stacks and Queues

10. Graphs

11. Trees

12. Linked Lists

19. Contests

01. ProjectEuler+

About

Topics

Packages