HACKERRANK SOLUTIONS

• 10 Days of Statistics
• 10 Days of Javascript
• Java
• SQL
• PYTHON

PROFILE

hackerrank

10 Days of Statistics

Day	Challenge	Points	Solution
0	Mean, Median, and Mode	30	Solution.java
0	Weighted Mean	30	Solution.java
1	Quartiles	30	Solution.java
1	Interquartile Range	30	Solution.java
1	Standard Deviation	30	Solution.java
2	Basic Probability	10	Solution
2	More Dice	10	Solution
2	Compound Event Probability	10	Solution
3	Conditional Probability	10	Solution
3	Cards of the Same Suit	10	Solution
3	Drawing Marbles	10	Solution
4	Binomial Distribution I	30	Solution.java
4	Binomial Distribution II	30	Solution.java
4	Geometric Distribution I	30	Solution.java
4	Geometric Distribution II	30	Solution.java
5	Poisson Distribution I	30	Solution.java
5	Poisson Distribution II	30	Solution.java
5	Normal Distribution I	30	Solution.java
5	Normal Distribution II	30	Solution.java
6	The Central Limit Theorem I	30	Solution.java
6	The Central Limit Theorem II	30	Solution.java
6	The Central Limit Theorem III	30	Solution.java
7	Pearson Correlation Coefficient I	30	Solution.java
7	Spearman's Rank Correlation Coefficient	30	Solution.java
8	Least Square Regression Line	30	Solution.java
8	Pearson Correlation Coefficient II	30	Solution
9	Multiple Linear Regression	30	Solution.java

10 Days of Javascript

Day	Challenge	Points	Solution
0	Hello World	10	Solution.js
0	Data Types	10	Solution.js
1	Arithmetic Operators	10	Solution.js
1	Functions	10	Solution.js
1	Let and Const	10	Solution.js
2	Conditional Statements: If-Else	10	Solution.js
2	Conditional Statements: Switch	10	Solution.js
2	Loops	10	Solution.js
3	Arrays	15	Solution.js
3	Try, Catch, and Finally	15	Solution.js
3	Throw	15	Solution.js
4	Create a Rectangle Object	15	Solution.js
4	Count Objects	15	Solution.js
4	Classes	15	Solution.js
5	Inheritance	15	Solution.js
5	Template Literals	15	Solution.js
5	Arrow Functions	15	Solution.js
6	Bitwise Operators	15	Solution.js
6	JavaScript Dates	15	Solution.js
7	Regular Expressions I	15	Solution.js
7	Regular Expressions II	15	Solution.js
7	Regular Expressions III	15	Solution.js
8	Create a Button	20	Solution.js
8	Buttons Container	25	Solution.js
9	Binary Calculator	30	Solution.js

Java

Subdomain	Challenge	Points	Solution
Introduction	Welcome to Java!	3	Solution.java
Introduction	Java Stdin and Stdout I	5	Solution.java
Introduction	Java If-Else	10	Solution.java
Introduction	Java Stdin and Stdout II	10	Solution.java
Introduction	Java Output Formatting	10	Solution.java
Introduction	Java Loops I	10	Solution.java
Introduction	Java Loops II	10	Solution.java
Introduction	Java Datatypes	10	Solution.java
Introduction	Java End-of-file	10	Solution.java
Introduction	Java Static Initializer Block	10	Solution.java
Introduction	Java Int to String	10	Solution.java
Introduction	Java Date and Time	15	Solution.java
Introduction	Java Currency Formatter	15	Solution.java
Strings	Java Strings Introduction	5	Solution.java
Strings	Java Substring	5	Solution.java
Strings	Java Substring Comparisons	10	Solution.java
Strings	Java String Reverse	10	Solution.java
Strings	Java Anagrams	10	Solution.java
Strings	Java String Tokens	15	Solution.java
Strings	Pattern Syntax Checker	20	Solution.java
Strings	Java Regex	25	Solution.java
Strings	Java Regex 2 - Duplicate Words	25	Solution.java
Strings	Valid Username Regular Expression	20	Solution.java
Strings	Tag Content Extractor	20	Solution.java
BigNumber	Java BigInteger	10	Solution.java
BigNumber	Java BigDecimal	20	Solution.java
BigNumber	Java Primality Test	20	Solution.java
Data Structures	Java 1D Array	5	Solution.java
Data Structures	Java 2D Array	10	Solution.java
Data Structures	Java Subarray	10	Solution.java
Data Structures	Java Arraylist	10	Solution.java
Data Structures	Java 1D Array (Part 2)	25	Solution.java
Data Structures	Java List	15	Solution.java
Data Structures	Java Map	10	Solution.java
Data Structures	Java Stack	20	Solution.java
Data Structures	Java Hashset	10	Solution.java
Data Structures	Java Generics	15	Solution.java
Data Structures	Java Comparator	10	Solution.java
Data Structures	Java Sort	10	Solution.java
Data Structures	Java Dequeue	20	Solution.java
Data Structures	Java BitSet	20	Solution.java
Object Oriented Programming	Java Inheritance I	5	Solution.java
Object Oriented Programming	Java Inheritance II	10	Solution.java
Object Oriented Programming	Java Abstract Class	10	Solution.java
Object Oriented Programming	Java Interface	10	Solution.java
Object Oriented Programming	Java Method Overriding	10	Solution.java
Object Oriented Programming	Java Method Overriding 2 (Super Keyword)	10	Solution.java
Object Oriented Programming	Java Instanceof keyword	10	Solution.java
Object Oriented Programming	Java Iterator	15	Solution.java
Exception Handling	Java Exception Handling (Try-catch)	10	Solution.java
Exception Handling	Java Exception Handling	15	Solution.java
Advanced	Java Varargs - Simple Addition	15	Solution.java
Advanced	Java Reflection - Attributes	15	Solution.java
Advanced	Can You Access	15	Solution.java
Advanced	Prime Checker	25	Solution.java
Advanced	Java Factory Pattern	15	Solution.java
Advanced	Java Singleton Pattern	15	Solution.java
Advanced	Java Visitor Pattern	40	Solution.java
Advanced	Java Annotations	25	Solution.java
Advanced	Covariant Return Types	20	Solution.java
Advanced	Java Lambda Expressions	30	Solution.java
Advanced	Java MD5	30	Solution.java
Advanced	Java SHA-256	30	Solution.java

SQL

Subdomain	Challenge	Points	Solution
Basic Select	Revising the Select Query I	10	SQL Solution
Basic Select	Revising the Select Query II	10	SQL Solution
Basic Select	Select All	10	SQL Solution
Basic Select	Select By ID	10	SQL Solution
Basic Select	Japanese Cities' Attributes	10	SQL Solution
Basic Select	Japanese Cities' Names	10	SQL Solution
Basic Select	Weather Observation Station 1	15	SQL Solution
Basic Select	Weather Observation Station 3	10	SQL Solution
Basic Select	Weather Observation Station 4	10	SQL Solution
Basic Select	Weather Observation Station 5	30	SQL Solution
Basic Select	Weather Observation Station 6	10	SQL Solution
Basic Select	Weather Observation Station 7	10	SQL Solution
Basic Select	Weather Observation Station 8	15	SQL Solution
Basic Select	Weather Observation Station 9	10	SQL Solution
Basic Select	Weather Observation Station 10	10	SQL Solution
Basic Select	Weather Observation Station 11	15	SQL Solution
Basic Select	Weather Observation Station 12	15	SQL Solution
Basic Select	Higher Than 75 Marks	15	SQL Solution
Basic Select	Employee Names	10	SQL Solution
Basic Select	Employee Salaries	10	SQL Solution
Advanced Select	Type of Triangle	20	SQL Solution
Advanced Select	The PADS	30	MYSQL Solution
Advanced Select	Occupations	30	MYSQL Solution
Advanced Select	Binary Tree Nodes	20	MYSQL Solution
Advanced Select	New Companies	20	MYSQL Solution
Aggregation	Revising Aggregations - The Count Function	10	MySQL Solution
Aggregation	Revising Aggregations - The Sum Function	10	MySQL Solution
Aggregation	Revising Aggregations - Averages	10	MySQL Solution
Aggregation	Average Population	10	MySQL Solution
Aggregation	Japan Population	10	SQL Solution
Aggregation	Population Density Difference	10	SQL Solution
Aggregation	The Blunder	15	SQL Solution
Aggregation	Top Earners	20	SQL Solution
Aggregation	Weather Observation Station 2	15	SQL Solution
Aggregation	Weather Observation Station 13	10	SQL Solution
Aggregation	Weather Observation Station 14	10	SQL Solution
Aggregation	Weather Observation Station 15	15	SQL Solution
Aggregation	Weather Observation Station 16	10	SQL Solution
Aggregation	Weather Observation Station 17	15	SQL Solution
Aggregation	Weather Observation Station 18	25	SQL Solution
Aggregation	Weather Observation Station 19	30	SQL Solution
Aggregation	Weather Observation Station 20	40	SQL Solution
Basic Join	Asian Population	10	SQL Solution
Basic Join	African Cities	10	SQL Solution
Basic Join	Average Population of Each Continent	10	SQL Solution
Basic Join	The Report	20	SQL Solution
Basic Join	Top Competitors	30	MYSQL Solution
Basic Join	Ollivander's Inventory	30	MYSQL Solution
Basic Join	Challenges	30	MYSQL Solution
Basic Join	Contest Leaderboard	30	MYSQL Solution
Advanced Join	Projects	40	MYSQL Solution
Advanced Join	Placements	40	MYSQL Solution
Advanced Join	Symmetric Pairs	40	MYSQL Solution
Advanced Join	Interviews	50	MYSQL Solution
Advanced Join	15 Days of Learning SQL	50	MYSQL Solution
Alternative Queries	Draw The Triangle 1	25	MYSQL Solution
Alternative Queries	Draw The Triangle 2	25	MYSQL Solution
Alternative Queries	Print Prime Numbers	40	MYSQL Solution

Python

Subdomain	Challenge	Points	Solution
Introduction	Say "Hello, World!" With Python	5	Solution.py
Introduction	Python If-Else	5	Solution.py
Introduction	Arithmetic Operators	10	Solution.py
Introduction	Python: Division	10	Solution.py
Introduction	Loops	10	Solution.py
Introduction	Write a function	10	Solution.py
Introduction	Print Function	10	Solution.py
Basic Data Types	List Comprehensions	10	Solution.py
Basic Data Types	Find the Runner-Up Score!	10	Solution.py
Basic Data Types	Nested Lists	10	Solution.py
Basic Data Types	Finding the percentage	10	Solution.py
Basic Data Types	Lists	10	Solution.py
Basic Data Types	Tuples	10	Solution.py
Strings	sWAP cASE	10	Solution.py
Strings	String Split and Join	10	Solution.py
Strings	What's Your Name?	10	Solution.py
Strings	Mutations	10	Solution.py
Strings	Find a string	10	Solution.py
Strings	String Validators	10	Solution.py
Strings	Text Alignment	10	Solution.py
Strings	Text Wrap	10	Solution.py
Strings	Designer Door Mat	10	Solution.py
Strings	String Formatting	10	Solution.py
Strings	Alphabet Rangoli	10	Not solved
Strings	Capitalize!	20	Not solved
Strings	The Minion Game	40	Not solved
Strings	Merge the Tools!	40	Not solved
Sets	Introduction to Sets	10	Solution.py
Sets	No Idea!	50	Solution.py
Sets	Symmetric Difference	10	Solution.py
Sets	Set .add()	10	Solution.py
Sets	Set .discard(), .remove() & .pop()	10	Solution.py
Sets	Set .union() Operation	10	Solution.py
Sets	Set .intersection() Operation	10	Solution.py
Sets	Set .difference() Operation	10	Solution.py
Sets	Set .symmetric_difference() Operation	10	Solution.py
Sets	Set Mutations	10	Solution.py
Sets	The Captain's Room	10	Solution.py
Sets	Check Subset	10	Solution.py
Sets	Check Strict Superset	10	Solution.py
Math	Polar Coordinates	10	Solution.py
Math	Find Angle MBC	10	Solution.py
Math	Mod Divmod	10	Solution.py
Math	Power - Mod Power	10	Solution.py
Math	Integers Come In All Sizes	10	Solution.py
Math	Triangle Quest	20	Solution.py
Math	Triangle Quest 2	10	Not solved
Itertools	itertools.product()	10	Solution.py
Itertools	itertools.permutations()	10	Solution.py
Itertools	itertools.combinations()	10	Solution.py
Itertools	itertools.combinations_with_replacement()	10	Solution.py
Itertools	Compress the String!	20	Solution.py
Itertools	Iterables and Iterators	40	Solution.py
Itertools	Maximize It!	50	Solution.py
Collections	collections.Counter()	10	Solution.py
Collections	DefaultDict Tutorial	20	Solution.py
Collections	Collections.namedtuple()	20	Solution.py
Collections	Collections.OrderedDict()	20	Solution.py
Collections	Word Order	50	Solution.py
Collections	Collections.deque()	20	Solution.py
Collections	Company Logo	30	Solution.py
Collections	Piling Up!	50	Solution.py
Date and Time	Calendar Module	10	Solution.py
Date and Time	Time Delta	30	Solution.py
Errors and Exceptions	Exceptions	10	Solution.py
Errors and Exceptions	Incorrect Regex	20	Solution.py