A collection of solutions for various HackerRank challenges.

Domain	Subdomain	Problem	Solution	Language	Difficulty	Score
Algorithms	Implementation	Bill Division	Bill Division	C#	Easy	10
Algorithms	Implementation	Breaking the Records	Breaking the Records	C#	Easy	10
Algorithms	Implementation	Divisible Sum Pairs	Divisible Sum Pairs	C#	Easy	10
Algorithms	Implementation	Grading Students	Grading Students	C#	Easy	10
Algorithms	Warmup	A Very Big Sum	A Very Big Sum	C#	Easy	10
Algorithms	Warmup	Birthday Cake Candles	Birthday Cake Candles	C#	Easy	10
Algorithms	Warmup	Compare the Triplets	Compare the Triplets	C#	Easy	10
Algorithms	Warmup	Diagonal Difference	Diagonal Difference	C#	Easy	10
Algorithms	Warmup	Mini-Max Sum	Mini-Max Sum	C#	Easy	10
Algorithms	Warmup	Plus Minus	Plus Minus	C#	Easy	10
Algorithms	Warmup	Simple Array Sum	Simple Array Sum	C#	Easy	10
Algorithms	Warmup	Solve Me First	Solve Me First	C#	Easy	1
Algorithms	Warmup	Staircase	Staircase	C#	Easy	10
Algorithms	Warmup	Time Conversion	Time Conversion	C#	Easy	15
Data Structures	Arrays	Arrays - DS	Array - DS	C#	Easy	10
Data Structures	Heap	Find the Running Median	Find the Running Median	C#	Hard	50
Data Structures	Stacks	Balanced Brackets	Balanced Brackets	C#	Medium	25
Data Structures	Trie	Contacts	Contacts	C#	Medium	40
Databases	Relational Algebra	Basics of Sets and Relations #1	Basics of Sets and Relations #1	-	Easy	5
Databases	Relational Algebra	Basics of Sets and Relations #2	Basics of Sets and Relations #2	-	Easy	5
Databases	Relational Algebra	Basics of Sets and Relations #3	Basics of Sets and Relations #3	-	Easy	5
Linux Shell	Bash	A Personalized Echo	A Personalized Echo	Bash	Easy	1
Linux Shell	Bash	Arithmetic Operations	Arithmetic Operations	Bash	Medium	3
Linux Shell	Bash	Comparing Numbers	Comparing Numbers	Bash	Easy	3
Linux Shell	Bash	Compute the Average	Compute the Average	Bash	Medium	4
Linux Shell	Bash	Getting started with conditionals	Getting started with conditionals	Bash	Easy	3
Linux Shell	Bash	Let's Echo	Let's Echo	Bash	Easy	1
Linux Shell	Bash	Looping and Skipping	Looping and Skipping	Bash	Easy	2
Linux Shell	Bash	Looping with Numbers	Looping with Numbers	Bash	Easy	2
Linux Shell	Bash	More on Conditionals	More on Conditionals	Bash	Easy	3
Linux Shell	Bash	The World of Numbers	The World of Numbers	Bash	Easy	2
Linux Shell	Text Processing	Cut #1	Cut #1	Bash	Easy	1
Linux Shell	Text Processing	Cut #2	Cut #2	Bash	Easy	1
SQL	Advanced Select	The PADS	The PADS	MySQL	Medium	30
SQL	Advanced Select	Type of Triangle	Type of Triangle	MySQL	Easy	20
SQL	Aggregation	Average Population	Average Population	MySQL	Easy	10
SQL	Aggregation	Japan Population	Japan Population	MySQL	Easy	10
SQL	Aggregation	Population Density Difference	Population Density Difference	MySQL	Easy	10
SQL	Aggregation	Revising Aggregations - Averages	Revising Aggregations - Averages	MySQL	Easy	10
SQL	Aggregation	Revising Aggregations - The Count Function	Revising Aggregations - The Count Function	MySQL	Easy	10
SQL	Aggregation	Revising Aggregations - The Sum Function	Revising Aggregations - The Sum Function	MySQL	Easy	10
SQL	Aggregation	The Blunder	The Blunder	MySQL	Easy	15
SQL	Aggregation	Top Earners	Top Earners	MySQL	Easy	20
SQL	Aggregation	Weather Observation Station 2	Weather Observation Station 2	MySQL	Easy	15
SQL	Aggregation	Weather Observation Station 13	Weather Observation Station 13	MySQL	Easy	10
SQL	Aggregation	Weather Observation Station 14	Weather Observation Station 14	MySQL	Easy	10
SQL	Aggregation	Weather Observation Station 15	Weather Observation Station 15	MySQL	Easy	15
SQL	Aggregation	Weather Observation Station 16	Weather Observation Station 16	MySQL	Easy	10
SQL	Aggregation	Weather Observation Station 17	Weather Observation Station 17	MySQL	Easy	15
SQL	Aggregation	Weather Observation Station 18	Weather Observation Station 18	MySQL	Medium	25
SQL	Aggregation	Weather Observation Station 19	Weather Observation Station 19	MySQL	Medium	30
SQL	Aggregation	Weather Observation Station 20	Weather Observation Station 20	MySQL	Medium	40
SQL	Basic Join	African Cities	African Cities	MySQL	Easy	10
SQL	Basic Join	Average Population of Each Continent	Average Population of Each Continent	MySQL	Easy	10
SQL	Basic Join	Contest Leaderboard	Contest Leaderboard	MySQL	Medium	30
SQL	Basic Join	Population Census	Population Census	MySQL	Easy	10
SQL	Basic Join	The Report	The Report	MySQL	Medium	20
SQL	Basic Join	Top Competitors	Top Competitors	MySQL	Medium	30
SQL	Basic Select	Employee Names	Employee Names	MySQL	Easy	10
SQL	Basic Select	Employee Salaries	Employee Salaries	MySQL	Easy	10
SQL	Basic Select	Higher Than 75 Marks	Higher Than 75 Marks	MySQL	Easy	15
SQL	Basic Select	Japanese Cities' Attributes	Japanese Cities' Attributes	MySQL	Easy	10
SQL	Basic Select	Japanese Cities' Names	Japanese Cities' Names	MySQL	Easy	10
SQL	Basic Select	Revising the Select Query I	Revising the Select Query I	MySQL	Easy	10
SQL	Basic Select	Revising the Select Query II	Revising the Select Query II	MySQL	Easy	10
SQL	Basic Select	Select All	Select All	MySQL	Easy	10
SQL	Basic Select	Select By ID	Select By ID	MySQL	Easy	10
SQL	Basic Select	Weather Observation Station 1	Weather Observation Station 1	MySQL	Easy	15
SQL	Basic Select	Weather Observation Station 3	Weather Observation Station 3	MySQL	Easy	10
SQL	Basic Select	Weather Observation Station 4	Weather Observation Station 4	MySQL	Easy	10
SQL	Basic Select	Weather Observation Station 5	Weather Observation Station 5	MySQL	Easy	30
SQL	Basic Select	Weather Observation Station 6	Weather Observation Station 6	MySQL	Easy	10
SQL	Basic Select	Weather Observation Station 7	Weather Observation Station 7	MySQL	Easy	10
SQL	Basic Select	Weather Observation Station 8	Weather Observation Station 8	MySQL	Easy	15
SQL	Basic Select	Weather Observation Station 9	Weather Observation Station 9	MySQL	Easy	10
SQL	Basic Select	Weather Observation Station 10	Weather Observation Station 10	MySQL	Easy	10
SQL	Basic Select	Weather Observation Station 11	Weather Observation Station 11	MySQL	Easy	15
SQL	Basic Select	Weather Observation Station 12	Weather Observation Station 12	MySQL	Easy	15
SQL	Advanced Select	The PADS	The PADS	MS SQL	Medium	30
SQL	Advanced Select	Type of Triangle	Type of Triangle	MS SQL	Easy	20
SQL	Aggregation	Average Population	Average Population	MS SQL	Easy	10
SQL	Aggregation	Japan Population	Japan Population	MS SQL	Easy	10
SQL	Aggregation	Population Density Difference	Population Density Difference	MS SQL	Easy	10
SQL	Aggregation	Revising Aggregations - Averages	Revising Aggregations - Averages	MS SQL	Easy	10
SQL	Aggregation	Revising Aggregations - The Count Function	Revising Aggregations - The Count Function	MS SQL	Easy	10
SQL	Aggregation	Revising Aggregations - The Sum Function	Revising Aggregations - The Sum Function	MS SQL	Easy	10
SQL	Aggregation	The Blunder	The Blunder	MS SQL	Easy	15
SQL	Aggregation	Top Earners	Top Earners	MS SQL	Easy	20
SQL	Aggregation	Weather Observation Station 2	Weather Observation Station 2	MS SQL	Easy	15
SQL	Aggregation	Weather Observation Station 13	Weather Observation Station 13	MS SQL	Easy	10
SQL	Aggregation	Weather Observation Station 14	Weather Observation Station 14	MS SQL	Easy	10
SQL	Aggregation	Weather Observation Station 15	Weather Observation Station 15	MS SQL	Easy	15
SQL	Aggregation	Weather Observation Station 16	Weather Observation Station 16	MS SQL	Easy	10
SQL	Aggregation	Weather Observation Station 17	Weather Observation Station 17	MS SQL	Easy	15
SQL	Aggregation	Weather Observation Station 18	Weather Observation Station 18	MS SQL	Medium	25
SQL	Aggregation	Weather Observation Station 19	Weather Observation Station 19	MS SQL	Medium	30
SQL	Aggregation	Weather Observation Station 20	Weather Observation Station 20	MS SQL	Medium	40
SQL	Basic Join	African Cities	African Cities	MS SQL	Easy	10
SQL	Basic Join	Average Population of Each Continent	Average Population of Each Continent	MS SQL	Easy	10
SQL	Basic Join	Contest Leaderboard	Contest Leaderboard	MS SQL	Medium	30
SQL	Basic Join	Population Census	Population Census	MS SQL	Easy	10
SQL	Basic Join	The Report	The Report	MS SQL	Medium	20
SQL	Basic Join	Top Competitors	Top Competitors	MS SQL	Medium	30
SQL	Basic Select	Employee Names	Employee Names	MS SQL	Easy	10
SQL	Basic Select	Employee Salaries	Employee Salaries	MS SQL	Easy	10
SQL	Basic Select	Higher Than 75 Marks	Higher Than 75 Marks	MS SQL	Easy	15
SQL	Basic Select	Japanese Cities' Attributes	Japanese Cities' Attributes	MS SQL	Easy	10
SQL	Basic Select	Japanese Cities' Names	Japanese Cities' Names	MS SQL	Easy	10
SQL	Basic Select	Revising the Select Query I	Revising the Select Query I	MS SQL	Easy	10
SQL	Basic Select	Revising the Select Query II	Revising the Select Query II	MS SQL	Easy	10
SQL	Basic Select	Select All	Select All	MS SQL	Easy	10
SQL	Basic Select	Select By ID	Select By ID	MS SQL	Easy	10
SQL	Basic Select	Weather Observation Station 1	Weather Observation Station 1	MS SQL	Easy	15
SQL	Basic Select	Weather Observation Station 3	Weather Observation Station 3	MS SQL	Easy	10
SQL	Basic Select	Weather Observation Station 4	Weather Observation Station 4	MS SQL	Easy	10
SQL	Basic Select	Weather Observation Station 5	Weather Observation Station 5	MS SQL	Easy	30
SQL	Basic Select	Weather Observation Station 6	Weather Observation Station 6	MS SQL	Easy	10
SQL	Basic Select	Weather Observation Station 7	Weather Observation Station 7	MS SQL	Easy	10
SQL	Basic Select	Weather Observation Station 8	Weather Observation Station 8	MS SQL	Easy	15
SQL	Basic Select	Weather Observation Station 9	Weather Observation Station 9	MS SQL	Easy	10
SQL	Basic Select	Weather Observation Station 10	Weather Observation Station 10	MS SQL	Easy	10
SQL	Basic Select	Weather Observation Station 11	Weather Observation Station 11	MS SQL	Easy	15
SQL	Basic Select	Weather Observation Station 12	Weather Observation Station 12	MS SQL	Easy	15