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7 kyu
Chinese Zodiac
1,980AcesOfGlory
Fundamentals
Arrays
7 kyu
Romanize Russian Passports
236bdupau
Strings
Fundamentals
5 kyu
Japanese Romaji-to-Hiragana Converter
111ewingsa
Logic
Strings
Parsing
Fundamentals
6 kyu
Numericals of a String
3,362Jomopipi
Puzzles
Performance
Algorithms
Retired
Simple transposition (retired)
2,887mariohernandezv
Algorithms
Cryptography
Fundamentals
5 kyu
Human Readable Time
143,158BattleRattle
Date Time
Mathematics
Algorithms
7 kyu
draw me a chessboard
2,484andrewMacmurray
Puzzles
Fundamentals
ASCII Art
Algorithms
6 kyu
Rectangle into Squares
32,503g964
Fundamentals
Geometry
Puzzles
6 kyu
Find within array
3,522kylehill
Arrays
Functional Programming
Fundamentals
6 kyu
Duplicate Arguments
4,366lunitik
Algorithms
4 kyu
Find the unknown digit
8,138JJ-Bug
Mathematics
Algorithms
Puzzles
6 kyu
Playing with digits
138,074g964
Fundamentals
Mathematics
4 kyu
Sum Strings as Numbers
43,585nicknovitski
Strings
Big Integers
Algorithms
7 kyu
Digital cypher
7,893dcieslak
Fundamentals
Ciphers
Cryptography
7 kyu
Digital cypher vol 2
3,171dcieslak
Fundamentals
Ciphers
Cryptography
5 kyu
Calculate Variance
2,533eerwitt
Statistics
Mathematics
Algorithms
6 kyu
Berlin Clock
541dupreesi
Date Time
Strings
Fundamentals
6 kyu
Easy Diagonal
2,249g964
Fundamentals
7 kyu
Regexp Basics - is it a vowel?
9,108taw
Regular Expressions
Fundamentals
8 kyu
Regexp Basics - is it a digit?
16,249taw
Regular Expressions
Fundamentals
7 kyu
Regexp Basics - is it a letter?
8,085taw
Regular Expressions
Fundamentals
6 kyu
Regexp basics - parsing time
869taw
Regular Expressions
Fundamentals
6 kyu
Regexp basics - parsing mana cost
371taw
Regular Expressions
Fundamentals
7 kyu
Regexp basics - parsing prices
1,461taw
Regular Expressions
Fundamentals
6 kyu
Regexp basics - parsing integers
430taw
Regular Expressions
Fundamentals
6 kyu
Regexp Basics - is it IPv4 address?
2,709taw
Regular Expressions
Fundamentals
7 kyu
Regexp Basics - is it a eight bit signed number?
893taw
Bits
Binary
Strings
Regular Expressions
Fundamentals
7 kyu
Regexp Basics - is it all whitespace?
1,432taw
Regular Expressions
Fundamentals
Retired
Largest product in a series (retired)
107Raulvv
Status:Retired
Mathematics
Algorithms
7 kyu
Evens and Odds
6,811ocirion
Fundamentals
Binary
8 kyu
Basic Mathematical Operations
218,141Quickz
Mathematics
Fundamentals
7 kyu
Sum of integers in string
10,726kingcobra
Fundamentals
6 kyu
Digital cypher vol 3 - missing key
1,037dcieslak
Fundamentals
Ciphers
Cryptography
7 kyu
Birthday I - Cake
7,161PG1
Fundamentals
Arrays
Mathematics
4 kyu
Matrix Determinant
22,969pjfranzini
Matrix
Linear Algebra
Mathematics
Recursion
Algorithms
6 kyu
Basic Encryption
3,237Tandyman
Mathematics
Strings
Ciphers
5 kyu
Rot13
91,895Rubikan
Ciphers
Fundamentals
5 kyu
ROT13
26,079hvaara
Strings
Ciphers
Regular Expressions
Algorithms
6 kyu
Simple ROT13.5 cypher
665user9247539
Algorithms
Fundamentals
Ciphers
Cryptography
6 kyu
ROT13 variant cipher
631user8580805
Cryptography
Security
Strings
Algorithms
7 kyu
Cipher
571bubmet
Algorithms
Ciphers
Cryptography
Strings
4 kyu
Vigenère Cipher Helper
8,273jacobb
Algorithms
Ciphers
Security
Object-oriented Programming
Strings
6 kyu
Tribonacci Sequence
154,059GiacomoSorbi
Number Theory
Arrays
Lists
Fundamentals
6 kyu
Fibonacci, Tribonacci and friends
13,246GiacomoSorbi
Arrays
Lists
Number Theory
Fundamentals
5 kyu
Primes in numbers
29,530g964
Fundamentals
Mathematics
6 kyu
A Rule of Divisibility by 13
15,677g964
Fundamentals
Algorithms
Mathematics
7 kyu
A Rule of Divisibility by 7
12,618g964
Fundamentals
7 kyu
Is n divisible by (...)?
7,583IVBakker
Fundamentals
7 kyu
Simple Fun #320: Scratch lottery I
1,120myjinxin2015
Puzzles
Regular Expressions
6 kyu
Count the smiley faces!
96,569St3f4n
Regular Expressions
Fundamentals
Retired
Count the Characters (retired)
3,679davidhu2000
Fundamentals
Regular Expressions
Algorithms
6 kyu
Count the days!
2,097zruF
Date Time
Fundamentals
6 kyu
Minutes to Midnight
1,130zruF
Date Time
Fundamentals
5 kyu
Guess The Gifts!
3,686BattleRattle
Algorithms
5 kyu
Integers: Recreation One
26,165g964
Fundamentals
Algorithms
7 kyu
Complementary DNA
223,798JustyFY
Strings
Fundamentals
6 kyu
Parse HTML/CSS Colors
2,708junthecoder
Fundamentals
Algorithms
Strings
Parsing
6 kyu
Regex Tic Tac Toe Win Checker
1,240tachyonlabs
Games
Regular Expressions
Fundamentals
7 kyu
Regex Match Generator: Alternation
282wthit56
Strings
Regular Expressions
Fundamentals
4 kyu
Human readable duration format
82,683davazp
Strings
Date Time
Algorithms
6 kyu
Vowel-consonant lexicon
599KenKamau
Strings
Arrays
Algorithms
5 kyu
ISBN-10 Validation
10,487nklein
Regular Expressions
Algorithms
4 kyu
Most frequently used words in a text
27,945markprzepiora
Strings
Filtering
Algorithms
Regular Expressions
6 kyu
Pyramid Array
18,557sahglie
Algorithms
5 kyu
Base64 Encoding
5,113joseph.varnado
Binary
Strings
Algorithms
6 kyu
Base Conversion
10,721BattleRattle
Strings
Mathematics
Algorithms
6 kyu
Persistent Bugger.
197,932joh_pot
Fundamentals
Mathematics
5 kyu
Not very secure
46,438mayrsascha
Regular Expressions
Strings
6 kyu
Run-length encoding
9,708bkaes
Strings
Algorithms
6 kyu
Valid Phone Number
19,818xDranik
Regular Expressions
Algorithms
6 kyu
Transformation iteration
254joh_pot
Strings
Fundamentals
5 kyu
Common Denominators
14,832g964
Fundamentals
Algorithms
Mathematics
6 kyu
Duplicate Encoder
221,373obnounce
Strings
Arrays
Fundamentals
Retired
Calculator (retired)
11,547obrok
Algorithms
Parsing
Logic
Strings
Expressions
Basic Language Features
Fundamentals
Retired
Friday the 13ths (retired)
2,977user5854572
Date Time
Strings
Fundamentals
6 kyu
ASCII Fun #1: X- Shape
1,593zruF
ASCII Art
5 kyu
Convert all the cases!
1,426AJFarmar
Strings
Regular Expressions
Algorithms
4 kyu
So Many Permutations!
47,460BattleRattle
Permutations
Strings
Algorithms
6 kyu
Array Helpers
22,982BattleRattle
Arrays
Fundamentals
Object-oriented Programming