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5 kyu
Rot13
91,959Rubikan
Ciphers
Fundamentals
3 kyu
Rail Fence Cipher: Encoding and Decoding
8,593darrentburgess
Algorithms
Ciphers
Cryptography
Strings
Security
4 kyu
Snail
76,194stevenbarragan
Arrays
Algorithms
6 kyu
Texting with an old-school mobile phone
888B1ts
Fundamentals
Strings
Algorithms
5 kyu
Is the King in check ?
1,419trashy_incel
Games
Arrays
Strings
Algorithms
4 kyu
Vigenère Cipher Helper
8,287jacobb
Algorithms
Ciphers
Security
Object-oriented Programming
Strings
5 kyu
Interlaced Spiral Cipher
388docgunthrop
Ciphers
Strings
Algorithms
5 kyu
[BF] Divmod
52Bubbler
Fundamentals
Esoteric Languages
Puzzles
6 kyu
[BF] Simple square root
26ozichukwu
Algorithms
Fundamentals
6 kyu
[Code Golf] BF for finding ASCII value
32___i
Esoteric Languages
Strings
Restricted
6 kyu
Decode the QR-Code
388zLuki
Algorithms
4 kyu
Create the QR-Code
115zLuki
Mathematics
Algorithms
3 kyu
Binomial Expansion
6,157TheDoctor
Mathematics
Algebra
Algorithms
6 kyu
Do not let him go
250user2553318
Strings
Arrays
Algorithms
5 kyu
Langton's Ant - Advanced Version
58anter69
Mathematics
Performance
Algorithms
4 kyu
Explosive Sum
8,576surtich
Algorithms
Mathematics
Fundamentals
5 kyu
Break the Caesar!
726kingcobra
Ciphers
Cryptography
Fundamentals
5 kyu
Unusual Cipher
104G_kuldeep
Ciphers
Fundamentals
3 kyu
Breaking the Vigenère Cipher
373petermaier1
Ciphers
Cryptography
Algorithms
6 kyu
[BF] RGB Hexadecimal to Decimal
29iNont
Fundamentals
Algorithms
Strings
Mathematics
4 kyu
Escape the maze
882cyril-lemaire
Fundamentals
Algorithms
3 kyu
Screen Locking Patterns
4,724rsalgado
Mathematics
Combinatorics
Geometry
Algorithms
Graph Theory
6 kyu
Maximum Depth of Nested Brackets
525nachoMonllor
Strings
Performance
Algorithms
4 kyu
Roman Numerals Helper
30,011jhoffner
Algorithms
Object-oriented Programming
4 kyu
Twice linear
22,892g964
Mathematics
Algorithms
4 kyu
Count ones in a segment
3,101d0n14
Binary
Performance
Algorithms
4 kyu
Balanced parentheses string
107ecolban
Algorithms
Dynamic Programming
4 kyu
Area of House from Path of Mouse
139docgunthrop
Strings
Puzzles
Algorithms
3 kyu
Alphametics Solver
419docgunthrop
Puzzles
Performance
Cryptography
Algorithms
2 kyu
Evaluate mathematical expression
9,517ankr
Mathematics
Parsing
Algorithms
5 kyu
Rectangle into Rectangles
233elzoughby
Puzzles
Fundamentals
Algorithms
Geometry
5 kyu
Best travel
20,588g964
Fundamentals
6 kyu
[BF] To UpperCase
54iNont
Fundamentals
Algorithms
Strings
6 kyu
[BF] Reverse Multiple Strings
41iNont
Fundamentals
Algorithms
Strings
6 kyu
[BF] Sum 0 to N
57iNont
Fundamentals
Algorithms
Mathematics
5 kyu
[BF] Draw Triangle
56iNont
Fundamentals
Algorithms
Strings
5 kyu
[BF] Is Palindrome?
22iNont
Fundamentals
Algorithms
Strings
4 kyu
Ranking Poker Hands
3,310FrankK
Games
Algorithms
Object-oriented Programming
3 kyu
Alphabetic Anagrams
6,237Azuaron
Mathematics
Logic
Strings
Algorithms
4 kyu
NIM the game
849xcthulhu
Mathematics
Games
Puzzles
6 kyu
Duplicate Encoder
221,534obnounce
Strings
Arrays
Fundamentals
6 kyu
Numericals of a String
3,362Jomopipi
Puzzles
Performance
Algorithms
4 kyu
Large Factorials
9,172matt c
Algorithms
Big Integers
3 kyu
Divide integers as strings
994Voile
Strings
Fundamentals
Big Integers
Algorithms
6 kyu
Round and Round
936Voile
Fundamentals
Debugging
6 kyu
Cat Kata, Part 1
1,539tachyonlabs
Mathematics
Fundamentals
5 kyu
Bananas
1,065dinglemouse
Strings
Algorithms
4 kyu
Find the unknown digit
8,144JJ-Bug
Mathematics
Algorithms
Puzzles
3 kyu
Make a spiral
14,641Bugari
Algorithms
Arrays
Logic
5 kyu
Rotate a square matrix like a vortex
563user5036852
Logic
Arrays
Algorithms
Matrix
5 kyu
Coding with Squared Strings
2,048g964
Fundamentals
Strings
Ciphers
Cryptography
3 kyu
Find the cheapest path
573FArekkusu
Algorithms
Performance
5 kyu
Phone Directory
6,733g964
Fundamentals
Strings
6 kyu
Your order, please
169,364iamstone
Strings
Fundamentals
6 kyu
Convert string to camel case
192,397jhoffner
Regular Expressions
Algorithms
Strings
4 kyu
parseInt() reloaded
17,625BattleRattle
Parsing
Strings
Algorithms
6 kyu
Driving Circles
84newsh
Fundamentals
5 kyu
Bird Mountain
1,801dinglemouse
Algorithms
Graph Theory
5 kyu
Snake Collision
130kodejuice
Arrays
Games
Algorithms
Simulation
Puzzles
6 kyu
Collision Detection - 2D Point in 2D Rectangle
60Souzooka
Mathematics
Geometry
Algorithms
4 kyu
Most frequently used words in a text
28,004markprzepiora
Strings
Filtering
Algorithms
Regular Expressions
5 kyu
Find the smallest
5,482g964
Fundamentals
5 kyu
Histogram - V2
150dinglemouse
Fundamentals
5 kyu
Second Variation on Caesar Cipher
1,971g964
Fundamentals
Ciphers
Cryptography
6 kyu
Simple Encryption #1 - Alternating Split
28,608user5036852
Cryptography
Algorithms
Strings
Arrays
Fundamentals
6 kyu
Tetris Series #2 — Primitive Gameplay
308Etoneja
Fundamentals
Games
Algorithms
Arrays
Logic
4 kyu
Longest Common Subsequence (Performance version)
2,406JohanWiltink
Performance
Strings
Dynamic Programming
Memoization
Algorithms
4 kyu
Burrows-Wheeler-Transformation
1,920muesli4
Lists
Puzzles
Algorithms
1 kyu
7×7 Skyscrapers
1,966JohanWiltink
Algorithms
Games
Performance
5 kyu
Nut Farm 2
411dinglemouse
Algorithms
6 kyu
Connect the Dots
350dinglemouse
Fundamentals
4 kyu
Regular expression for binary numbers divisible by 5
2,204aswitalski
Binary
Algorithms
Regular Expressions
2 kyu
Regular Expression - Check if divisible by 0b111 (7)
2,182Hacker Sakana
Puzzles
Regular Expressions
Strings
Algorithms