Awesome Open Source
Awesome Open Source

HackerRank

Solutions Languages NodeJS Version

Efficient HackerRank solutions in JavaScript programmed by Gabriel Giordano

10 Days of Statistics

Day Problem Solution Difficulty Points Note
9 Multiple Linear Regression (Last day) JavaScript Medium 30 Implementation of a research from Ahmad Farooq and Khan Hamid, from C to JavaScript with some custom modifications
8 Least Square Regression Line JavaScript Easy 30
7 Spearman's Rank Correlation Coefficient JavaScript Easy 30
7 Pearson Correlation Coefficient I JavaScript Easy 30
6 The Central Limit Theorem III JavaScript Easy 30
6 The Central Limit Theorem II JavaScript Easy 30
6 The Central Limit Theorem I JavaScript Easy 30
5 Normal Distribution II JavaScript Easy 30
5 Normal Distribution I JavaScript Easy 30
5 Poison Distribution II JavaScript Easy 30
5 Poison Distribution I JavaScript Easy 30
4 Geometric Distribution II JavaScript Easy 30
4 Geometric Distribution I JavaScript Easy 30
4 Binomial Distribution II JavaScript Easy 30
4 Binomial Distribution I JavaScript Easy 30
2 Compound Event Probability JavaScript
2 More Dice JavaScript
2 Basic Probability JavaScript
1 Standard Deviation JavaScript Easy 30
1 Interquartile Range JavaScript Easy 30
1 Quartiles JavaScript Easy 30
0 Weighted Mean JavaScript Easy 30
0 Mean, Median, and Mode JavaScript Easy 30

Algorithms

Implementation

Problem Solution Difficulty Points Note
Matrix Layer Rotation JavaScript Hard 80 Math solution to the problem, O(1) if the loop to print the result isn't considered, otherwise O(m*n)
ACM ICPC Team JavaScript Easy 25 Using bitwise operations, and a custom Hamming Weight implementation to count ones, because the HackerRank's v8 version hasn't yet a BigInt implementation. Best case O(n^2) where n is the topics length
Queen's Attack II JavaScript Medium 30 Math solution to the problem, O(k), where k is the number of obstacles
Modified Kaprekar Numbers JavaScript Easy 30 Math and very performatic solution, without using Strings nor brute force, O(n), where n = q - p
Equalize the Array JavaScript Easy 20 O(n)
Jumping on the Clouds JavaScript Easy 20 O(log n)
Repeated String JavaScript Easy 20 The algorithm doesn't count the string a second time, both best and worst case is O(n) where n is the length of the string
Lisa's Workbook JavaScript Easy 25
Bigger is Greater JavaScript Medium 35
Organizing Containers of Balls JavaScript Medium 30
The Time in Words JavaScript Medium 25 O(1)
Beautiful Triplets JavaScript Easy 20 O(n)
Minimum Distances JavaScript Easy 20 O(n)
Halloween Sale JavaScript Easy 20 O(1)
Non-Divisible Subset JavaScript Medium 20
Cut the Sticks JavaScript Easy 25
Library Fine JavaScript Easy 15 O(1)
Sherlock and Squares JavaScript Easy 20 O(1)
Append and Delete JavaScript Easy 20 O(min(s, t))
Extra Long Factorials JavaScript Medium 20
Service Lane JavaScript Easy 20
Chocolate Feast JavaScript Easy 25 O(1)
Find Digits JavaScript Easy 25 O(n)
Jumping on the Clouds: Revisited JavaScript Easy 15 O(n / k) where k is the number of jumps
Sequence Equation JavaScript Easy 20
Circular Array Rotation JavaScript Easy 20
Save the Prisoner! JavaScript Easy 15 O(1)
Viral Advertising JavaScript Easy 15 Alternative way to solve it using this integer sequence formula: https://oeis.org/A061418
Beautiful Days at the Movies JavaScript Easy 15 O(n)
Angry Professor JavaScript Easy 20 O(n)
Utopian Tree JavaScript Easy 20 O(1)
Designer PDF Viewer JavaScript Easy 20
The Hurdle Race JavaScript Easy 15 O(1)
Climbing the Leaderboard JavaScript Medium 20 O(n + log(m))
Picking Numbers JavaScript Easy 20 O(1)
Forming a Magic Square JavaScript Medium 20 Using Édouard Lucas general formula to generate all possible magic squares of order 3
Cats and a Mouse JavaScript Easy 15 O(1)
Eletronics Shop JavaScript Easy 15
Counting Valleys JavaScript Easy 15 O(n)
Drawing Book JavaScript Easy 10 O(1)
Sock Merchant JavaScript Easy 10 O(1)
Bon Appétit JavaScript Easy 10 O(n)
Day of the Programmer JavaScript Easy 10 O(1)
Migratory Birds JavaScript Easy 10
Divisible Sum Pairs JavaScript Easy 10
Birthday Chocolate JavaScript Easy 10
Breaking the Records JavaScript Easy 10 O(n)
Between Two Sets JavaScript Easy 10 Using Euclid's division algorithm for greatest common divisor
Kangaroo JavaScript Easy 10
Apple and Orange JavaScript Easy 10
Grading Students JavaScript Easy 10

Data Structures

Problem Solution Difficulty Points Note
Array Manipulation JavaScript Hard 60
Sparse Arrays JavaScript Medium 25
Dynamic Array JavaScript Easy 15
Array DS JavaScript Easy 10

Constructive Algorithms

Problem Solution Difficulty Points Note
New Year Chaos JavaScript Medium 40

Warmup

Problem Solution Difficulty Points Note
Time Conversion JavaScript Easy 15
Birthday Cake Candles JavaScript Easy 10
Mini-Max Sum JavaScript Easy 10
Staircase JavaScript Easy 10
Plus Minus JavaScript Easy 10
Diagonal Difference JavaScript Easy 10
A Very Big Sum JavaScript Easy 10
Compare the Triplets JavaScript Easy 10

Mathematics

Problem Solution Difficulty Points Note
Army Game JavaScript Easy 10
Minimum Height Triangle JavaScript Easy 10
Handshake JavaScript Easy 10
Maximum Draws JavaScript Easy 5
Find the Point JavaScript Easy 5

Interview Preparation Kit

Arrays

Problem Solution Difficulty Points Note
Minimun Swaps 2 JavaScript Medium 40
Arrays: Left Rotation JavaScript Easy 15
2D Array - DS JavaScript Easy 15

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