This is a repository containing my solutions to Hackerrank problems.

Problem (Link)	Points
2D array - ds	15
3D surface area	30
Absolute permutation	40
ACM ICPC team	25
Almost sorted	50
Alternating characters	20
Anagram	25
And xor or	70
Angry professor	20
Append and delete	20
Apple and orange	10
Array and simple queries	80
Array manipulation	60
Array pairs	100
Arrays - ds	10
A very big sum	10
Balanced brackets	25
Balanced forest	18
Bear and steady gene	50
Beautiful binary string	20
Beautiful days at the movies	15
Beautiful quadruples	50
Beautiful triplets	20
Between two sets	10
Bigger is greater	35
Big sorting	20
Bill division	10
Binary search tree: insertion	20
Binary search tree: lowerst common ancestor	30
Birthday cake candles	10
Breadth first search: shortest reach	55
Breaking the records	10
Caesar cipher	15
Camel case	15
Camel case 4	100
Cats and a mouse	15
Castle on the grid	100
Cavity map	30
Chief hopper	100
Chocolate feast	25
Circular array rotation	20
Climbing the leaderboard	20
Closest numbers	35
Common child	100
Compare the triplets	10
Compare two linked lists	5
Components in a graph	50
Connected cells in a grid	50
Contacts	100
Correctness and the loop invariant	30
Costly intervals	45
Counting on a tree	44
Counting sort 1	30
Counting sort 2	30
Counting valleys	15
Count luck	50
Cube summation	100
Cut the sticks	25
Cut the tree	50
Cycle detection	5
Day of the programmer	15
Delete a node	5
Delete duplicate-value nodes from a sorted linked list	5
Designer pdf viewer	20
Determining DNA health	50
Diagonal difference	10
Direct connections	60
Divisible sum pairs	10
Drawing book	10
Dynamic array	15
Down to zero II	40
Electronics shop	15
Ema's supercomputer	40
Equalize the array	20
Equal stacks	100
Encryption	30
Even tree	50
Fair rations	25
Find digits	25
Find maximum index product	100
Find merge point of two lists	5
Find the median	35
Find the running median	100
Flatland space stations	25
Floyd: City of blinding lights	100
Forming a magic square	100
Fraudulent activity notifications	40
Funny string	25
Game of thrones	30
Game of two stacks	30
Gemstones	20
Gena playing hanoi	100
Get node value	5
Grading students	10
Gridland metro	25
Hackerland radio transmitters	100
Halloween sale	20
Happy ladybugs	30
Hackerrank in a string	20
Highest value palindrome	100
Ice cream parlor	100
Insert a node at a specific position in linked list	5
Insert a node at the head of a linked list	5
Insert a node at the tail of a linked list	5
Insert a node into a sorted doubly linked list	5
Insertion sort advanced analysis	50
Insertion sort - part 1	30
Insertion sort - part 2	30
Intro to tutorial challenges	30
Is this a binary search tree?	30
Jack goes to rapture	100
Jenny's subtrees	66
Jesse and cookies	100
Jim and the skyscrapers	60
Journey to the moon	100
Jumping on the clouds	20
Jumping on the clouds: revisited	15
Kindergarten adventrues	30
Kitty's calculation on a tree	52
Kruskal (MST): Really special subtree	50
Kundu and tree	80
Largest rectangle	100
Larry's array	40
Left rotation	20
Library fine	15
Lily's homework	100
Lisa's workbook	25
Making anagrams	30
Manasa and stones	30
Mars exploration	15
Matrix layer rotation	80
Maximum element	20
Maximum palindromes	40
Median updates	70
Marc's cakewalk	15
Merge two sorted linked lists	5
Merging communities	100
Migratory birds	10
Mini-max sum	10
Minimum absolute difference in an array	15
Minimum average waiting time	80
Minimum distances	20
Minimum loss 1	100
Missing numbers	45
Modified kaprekar numbers	30
Morgan and a string	100
Mr. X and his shots	50
New year chaos	40
Non-divisible subset	20
No prefix set	100
Number line jumps	10
Organizing containers of balls	30
Pairs	50
Palindrome index	25
Palindromic subsets	80
Pangrams	20
Picking numbers	20
Plus minus	10
Poisonous plants	70
Polynomial division	60
Prim's (MST): Special subtree	100
Print in reverse	5
Print the elements of a linked list	5
Red knight's shortest path	60
Repeated string	20
Reverse a doubly linked list	5
Reverse a linked list	5
Running time of algorithms	30
Qheap 1	25
Queen's attack II	30
Queries with fixed length	100
Queue using two stacks	100
Quicksort 1 - partition	10
Roads and libraries	100
Sales by match	10
Save the prisoner	15
Self balancing tree	50
Self driving bus	52
Separate the numbers	20
Sequence equation	20
Service lane	20
Sherlock and anagrams	100
Sherlock and array	40
Sherlock and squares	20
Sherlock and the valid string	35
Short palindrome	100
Simple array sum	10
Simple text editor	65
Snakes and ladders: the quickest way up	50
Solve me first	1
Sparse arrays	25
Square-ten tree	60
Staircase	10
Stock maximize	100
String construction	25
Strong password	15
Subarray division	10
Subsequence weighting	60
Super maximum cost queries	60
Super reduced string	10
Swap nodes [Algo]	40
Taum and b'day	25
The coin change problem	100
The full counting sort	40
The grid search	30
The hurdle race	15
The love letter mystery	20
The maximum subarray	100
The story of a tree	50
The strange function	15
The time in words	25
Time conversion	15
Tree: height of a binary tree	10
Tree: huffman decoding	20
Tree: level order traversal	20
Tree: inorder traversal	10
Tree: preorder traversal	10
Tree: postorder traversal	10
Tree: top view	20
Truck tour	50
Two characters	100
Two two	150
Two strings	25
Unique colors	7
Utopian tree	20
Waiter	100
Weighted uniform strings	100
Viral advertising	15