I'm working on modernizing Rosetta Code's infrastructure. Starting with communications. Please accept this time-limited open invite to RC's Slack.. --Michael Mol (talk) 20:59, 30 May 2020 (UTC)

Rosetta Code/Count examples/Full list

From Rosetta Code

Full output for the Rosetta Code/Count examples#Raku task. Updated periodically.

This is something of a experiment. The languages have their completed task entries marked with a circled digit in the table so you can sort on the language to see which tasks have been done. Hold down control and click on several columns to do secondary, tertiary, etc. sorts. Ideally it would be nice to be able to generate the table on demand for any language but it is fairly intensive to generate. Once a week is ok, on demand would be unsustainable.

More than about 10 languages per page gets unwieldy and difficult to navigate. Generate reports for the top N languages in groups of 10. (N == 40 for now.)

See Rosetta_Code/Rank_languages_by_popularity/Full_list for a full language/task completion table.

Top tier Second tier Third tier Fourth tier
First ten programming languages by number of task examples completed:
    ① Go            ② Phix          ③ Julia         ④ Raku          ⑤ Perl         
    ⑥ Python        ⑦ Kotlin        ⑧ C             ⑨ Java          ⑩ Wren         
As of 2021-04-11T18:47:22Z :: Tasks: 1101 :: Draft Tasks:261 :: Total Tasks: 1362 :: Total Examples: 75108
Count Task
485 Hello world/Text
322 99 bottles of beer
315 100 doors
314 FizzBuzz
287 Factorial
286 Fibonacci sequence
275 Comments
265 A+B
260 Empty program
239 Function definition
229 Loops/Infinite
225 Loops/While
224 Reverse a string
223 Arrays
221 Ackermann function
206 Loops/For
200 Conditional structures
198 Greatest common divisor
197 Greatest element of a list
196 Arithmetic/Integer
187 Array concatenation
186 Repeat a string
185 Even or odd
185 Integer comparison
183 Averages/Arithmetic mean
181 Increment a numerical string
178 Hello world/Graphical
173 Copy a string
169 Boolean values
169 Sieve of Eratosthenes
168 Loops/Downward for
167 String concatenation
165 Apply a callback to an array
165 Character codes
164 Loops/Do-while
164 Loops/N plus one half
163 Hello world/Newline omission
163 Loops/For with a specified step
163 Sum and product of an array
162 Array length
162 Integer sequence
162 Loops/Foreach
162 String length
162 Towers of Hanoi
161 Binary digits
161 Palindrome detection
160 Loops/Break
159 Sum of a series
158 String case
156 Tokenize a string
155 Generic swap
155 Leap year
155 Rot-13
154 Dot product
154 Empty string
154 Hailstone sequence
154 Sum of squares
153 Logical operations
150 Associative array/Creation
150 Filter
149 Quine
148 Sort an integer array
147 Sorting algorithms/Bubble sort
145 Execute a system command
144 Caesar cipher
144 Factors of an integer
143 Guess the number
143 Loop over multiple arrays simultaneously
143 Roman numerals/Encode
143 System time
142 Higher-order functions
141 Remove duplicate elements
141 Sorting algorithms/Quicksort
140 Determine if a string is numeric
140 User input/Text
139 File input/output
137 Bitwise operations
137 Day of the week
137 Primality by trial division
136 Hello world/Standard error
136 Luhn test of credit card numbers
135 Command-line arguments
135 Read entire file
134 Create a file
134 Stack
133 Loops/Continue
132 Happy numbers
132 Mutual recursion
132 Substring
131 Sleep
130 Generate lower case ASCII alphabet
130 Zero to the zero power
129 Least common multiple
129 Literals/String
129 Pascal's triangle
128 Check that file exists
128 Date format
128 Flatten a list
127 ABC problem
124 Binary search
124 Compound data type
124 Program termination
123 Balanced brackets
123 Ethiopian multiplication
123 Function composition
123 Literals/Integer
122 Detect division by zero
122 Include a file
122 Variables
121 Formatted numeric output
121 Loops/Nested
120 Associative array/Iteration
120 Knuth shuffle
120 N-queens problem
119 Averages/Root mean square
118 Mandelbrot set  
118 Null object
118 Read a file line by line
117 Count occurrences of a substring
117 Roman numerals/Decode
117 Search a list
117 Sorting algorithms/Insertion sort
116 Anagrams
116 Count in octal
116 Hash from two arrays
116 Multiplication tables
116 Real constants and functions
115 Case-sensitivity of identifiers
115 Delete a file
115 File size
115 Guess the number/With feedback
115 Identity matrix
114 Classes
114 Matrix transposition
113 Align columns
113 Babbage problem
113 Environment variables
113 Find limit of recursion
113 Input loop
113 Matrix multiplication
113 String matching
112 Averages/Median
112 Letter frequency
112 Pick random element
112 Random numbers
112 Rename a file
111 Hostname
111 Return multiple values
110 HTTP  
110 Pangram checker
110 Perfect numbers
109 Arithmetic/Complex
109 Haversine formula
108 Accumulator factory
108 Assertions
108 Catalan numbers
108 Conway's Game of Life
108 Temperature conversion
107 Infinity
106 Horner's rule for polynomial evaluation
106 Permutations
106 Substring/Top and tail
106 Variadic function
105 Averages/Pythagorean means
105 Levenshtein distance
105 Look-and-say sequence
105 Program name
105 Run-length encoding
105 Strip a set of characters from a string
104 Anonymous recursion
104 Arithmetic-geometric mean
104 Evaluate binomial coefficients
104 Reverse words in a string
104 Sierpinski triangle
104 String append
103 Prime decomposition
103 Regular expressions
103 Strip whitespace from a string/Top and tail
103 Zig-zag matrix
102 Comma quibbling
102 Exceptions
102 Nth root
102 String interpolation (included)
102 Trigonometric functions
101 Bulls and cows
101 Combinations
101 Ordered words
101 Queue/Definition
101 Sorting algorithms/Merge sort
99 Middle three digits
99 Shell one-liner  
99 Short-circuit evaluation
99 Sorting algorithms/Selection sort
98 Call a function
98 String prepend
98 Sum multiples of 3 and 5
97 24 game  
97 Arbitrary-precision integers (included)
97 Create a two-dimensional array at runtime
97 Range extraction
96 Interactive programming  
96 Power set
96 Range expansion
96 Sum digits of an integer
96 Y combinator
95 Harshad or Niven series
95 Sorting algorithms/Gnome sort
94 Collections
94 Enumerations
94 Time a function
94 Vector products
93 Digital root
93 Evolutionary algorithm
93 First-class functions
93 Sierpinski carpet
93 The Twelve Days of Christmas
93 Walk a directory/Non-recursively  
92 Averages/Mode
92 Execute Brain****
92 Exponentiation operator
92 Inheritance/Single
92 MD5
92 N'th
92 One-dimensional cellular automata
92 Sequence of non-squares
92 Sorting algorithms/Cocktail sort
91 Create an HTML table
90 Cumulative standard deviation
90 JSON
90 Random number generator (included)
90 Sort using a custom comparator
89 Averages/Simple moving average
89 Dragon curve
89 Forward difference
89 Hello world/Newbie
89 Sorting algorithms/Bogosort
89 String comparison
89 Symmetric difference
88 Entropy
88 Hamming numbers
88 Josephus problem
88 Langton's ant
88 Monty Hall problem
87 Gray code
87 Greatest subsequential sum
87 Number names
87 Price fraction
86 CSV data manipulation
86 Five weekends
86 Menu
86 Number reversal game
86 Tree traversal
85 Abstract type
85 Abundant, deficient and perfect number classifications
85 Compare a list of strings
84 CSV to HTML translation
84 Hofstadter Q sequence
84 Map range
84 Sorting algorithms/Heapsort
83 Catamorphism
83 Last Friday of each month
83 Non-decimal radices/Convert
83 Queue/Usage
83 Simple windowed application  
83 Sort an array of composite structures
83 Walk a directory/Recursively  
83 Window creation  
82 Closures/Value capture
82 File modification time  
82 SEDOLs
82 Set
82 Terminal control/Clear the screen
81 Box the compass
81 Count in factors
81 Introspection
81 Monte Carlo methods
81 URL decoding
80 Amicable pairs
80 Calculating the value of e
80 Hello world/Line printer  
80 Literals/Floating point
80 Terminal control/Ringing the terminal bell
79 Count the coins
79 Long multiplication
79 Playing cards
79 Roots of unity
79 Singly-linked list/Traversal
79 Sorting algorithms/Shell sort
79 Spiral matrix
79 Split a character string based on change of character
79 Top rank per group
79 Web scraping  
78 Bitmap
78 Concurrent computing
78 Date manipulation
78 Find common directory path
78 Find the last Sunday of each month
78 Order two numerical lists
78 Read a specific line from a file
78 Show the epoch
78 XML/Input
77 Address of a variable
77 CRC-32
77 Floyd's triangle
77 Jensen's Device
77 Knapsack problem/0-1
77 Linear congruential generator
77 Multifactorial
77 Operator precedence
77 Proper divisors
77 Pythagorean triples
77 Repeat
77 Sockets  
77 Sorting algorithms/Counting sort
77 Strip comments from a string
77 Word wrap
76 Call an object method
76 Find the missing permutation
76 Here document    
76 Keyboard input/Obtain a Y or N response  
76 Munchausen numbers
76 URL encoding
75 Almost prime
75 Dynamic variable names  
75 Kaprekar numbers
75 Lucas-Lehmer test
75 Man or boy test
75 Modular inverse
75 Non-decimal radices/Output
74 Anagrams/Deranged anagrams
74 Averages/Mean angle
74 Calendar
74 List comprehensions
74 Parsing/RPN calculator algorithm
74 Phrase reversals
74 Population count
74 Read a configuration file
74 SHA-1
74 Semordnilap
74 Sorting algorithms/Comb sort
74 Soundex
74 Unicode variable names
73 Equilibrium index
73 Fibonacci n-step number sequences
73 Gamma function
73 Hello world/Web server  
73 Multiple distinct objects
73 Pi
73 Sudoku
73 Write entire file
72 Animation  
72 Empty directory
72 Exceptions/Catch an exception thrown in a nested call
72 Execute HQ9+
72 SHA-256
72 Singly-linked list/Element definition
72 Special characters
71 AKS test for primes
71 Convert seconds to compound duration
71 Longest common subsequence
71 Rock-paper-scissors  
71 Show ASCII table
71 Sort disjoint sublist
71 Take notes on the command line  
70 Bitmap/Bresenham's line algorithm  
70 Call a foreign-language function
70 Currying
70 Enforced immutability
70 Euler's sum of powers conjecture
70 Largest int from concatenated ints
70 Polymorphism
70 Quaternion type
70 Stair-climbing puzzle
70 Vigenère cipher
70 Write float arrays to a text file
70 Zeckendorf number representation
69 15 puzzle game  
69 Catalan numbers/Pascal's triangle
69 Closest-pair problem
69 Combinations with repetitions
69 Constrained random points on a circle
69 Draw a sphere
69 Flow-control structures
69 Four bit adder
69 Guess the number/With feedback (player)
69 IBAN
69 Numerical integration
69 Old lady swallowed a fly
69 Self-describing numbers
69 Sorting algorithms/Stooge sort
69 Trabb Pardo–Knuth algorithm
68 Euler method
68 Extend your language
68 Horizontal sundial calculations
68 Jump anywhere
68 Magic squares of odd order
68 Maze generation  
68 Priority queue
68 Text processing/Max licenses in use
67 Benford's law
67 Fast Fourier transform
67 Fork  
67 Fractal tree  
67 Named parameters
67 Nested function
67 Pernicious numbers
67 Sorting algorithms/Pancake sort
67 Unix/ls
66 Arithmetic/Rational
66 Chinese remainder theorem
66 One of n lines in a file
66 Remove lines from a file
66 Roots of a function
66 Runtime evaluation    
66 Sequence of primes by trial division
66 Sort stability
66 Special variables
66 Strip control codes and extended characters from a string
65 Amb    
65 Documentation
65 General FizzBuzz
65 HTTPS  
65 Morse code  
65 Narcissistic decimal number
65 Optional parameters
65 Roots of a quadratic function
65 Variable size/Get  
64 Barnsley fern  
64 Continued fraction
64 Hofstadter-Conway $10,000 sequence
64 Inheritance/Multiple
64 Reduced row echelon form
64 Thue-Morse
64 XML/Output
63 Anti-primes
63 Factors of a Mersenne number
63 Memory allocation
63 Non-decimal radices/Input
63 Singly-linked list/Element insertion
63 Write language name in 3D ASCII
62 Animate a pendulum  
62 Cholesky decomposition
62 Circles of given radius through two points
62 Department numbers
62 Exponentiation order
62 Globally replace text in several files  
62 Mouse position
62 Plot coordinate pairs  
62 Probabilistic choice
62 Rep-string
62 Runge-Kutta method
62 Semiprime
62 Undefined values
61 Angle difference between two bearings
61 Averages/Mean time of day
61 Binary strings
61 Get system command output
61 Modular exponentiation
61 Sort three variables
61 Sorting algorithms/Sleep sort
61 Tic-tac-toe
61 Van der Corput sequence
60 Arithmetic evaluation  
60 Best shuffle
60 Jewels and stones
60 Knapsack problem/Continuous
60 Miller–Rabin primality test
60 Partial function application
60 Test a function
60 Truncatable primes
59 24 game/Solve    
59 9 billion names of God the integer
59 Bitmap/Write a PPM file  
59 Damm algorithm
59 Draw a clock  
59 Dutch national flag problem
59 Emirp primes
59 Generator/Exponential
59 Host introspection  
59 Huffman coding
59 Knapsack problem/Unbounded
59 Unicode strings
59 Word frequency
58 Add a variable to a class instance at runtime    
58 Brownian tree  
58 Compile-time calculation    
58 Hash join  
58 Knight's tour
58 Odd word problem
58 Two sum
58 User input/Graphical  
58 Yin and yang  
57 2048  
57 4-rings or 4-squares puzzle
57 Deal cards for FreeCell
57 Delegates
57 Draw a cuboid
57 I before E except after C
57 Integer overflow
57 JortSort
57 Left factorials
57 Leonardo numbers
57 Ludic numbers
57 Mad Libs
57 Matrix-exponentiation operator  
57 Multisplit
57 Random number generator (device)  
57 Scope modifiers
57 Sorting algorithms/Bead sort
57 Sorting algorithms/Permutation sort
57 Stem-and-leaf plot  
57 Stern-Brocot sequence
57 Terminal control/Display an extended character
57 Truncate a file
56 100 prisoners
56 Cartesian product of two or more lists
56 DNS query  
56 Dinesman's multiple-dwelling problem
56 Discordian date
56 Doubly-linked list/Element definition
56 Extract file extension
56 Fibonacci word
56 LZW compression
56 Longest common prefix
56 Rosetta Code/Rank languages by popularity  
56 Singleton
56 Subleq
56 Terminal control/Coloured text  
56 Topological sort
55 Base64 encode data
55 Define a primitive data type  
55 Extreme floating point values
55 Forest fire    
55 Grayscale image  
55 Long year  
55 Modulinos  
55 Munching squares
55 Sierpinski triangle/Graphical
55 Stack traces
54 CUSIP
54 Draw a pixel
54 Handle a signal
54 Pointers and references
54 Quickselect algorithm
54 Runtime evaluation/In an environment    
54 Synchronous concurrency
54 Terminal control/Cursor positioning  
54 Unbias a random generator
54 XML/XPath  
53 Abundant odd numbers
53 Bernoulli numbers
53 Convert decimal number to rational
53 Maximum triangle path sum
53 Non-continuous subsequences
53 Send email  
53 Statistics/Basic
53 Ternary logic
53 XML/DOM serialization  
52 First-class functions/Use numbers analogously    
52 Heronian triangles
52 Inverted syntax
52 Iterated digits squaring
52 Keyboard input/Keypress check
52 Longest increasing subsequence
52 Loops/Increment loop index within loop body
52 Magic 8-ball
52 Polynomial regression
52 Seven-sided dice from five-sided dice
52 Strip block comments
52 Text processing/2
51 Call a function in a shared library  
51 Determine if a string has all the same characters
51 Dining philosophers  
51 FASTA format
51 Farey sequence
51 Gaussian elimination  
51 Longest common substring
51 Move-to-front algorithm
51 Pig the dice game
51 Respond to an unknown method call    
51 Shoelace formula for polygonal area
51 Smith numbers
51 Universal Turing machine  
51 Vector
51 Wireworld    
50 Archimedean spiral
50 Attractive numbers
50 Base64 decode data
50 Chinese zodiac
50 Colour bars/Display
50 Copy stdin to stdout
50 Determine if a string is collapsible
50 Dijkstra's algorithm  
50 Find the intersection of two lines
50 GUI component interaction  
50 Holidays related to Easter
50 ISBN13 check digit
50 Make directory path  
50 Pascal matrix generation
50 Perfect shuffle
50 Rate counter
50 Sattolo cycle
50 Validate International Securities Identification Number
49 Fractran  
49 Jaro distance
49 Last letter-first letter
49 RPG attributes generator
49 Search a list of records
49 Text processing/1
49 Tokenize a string with escaping
48 Chaos game  
48 Determinant and permanent
48 Doubly-linked list/Element insertion
48 Doubly-linked list/Traversal  
48 Extensible prime generator
48 Greyscale bars/Display  
48 Kernighans large earthquake problem
48 Metaprogramming  
48 Naming conventions  
48 Password generator  
48 Polymorphic copy
48 Polynomial long division
48 Sort numbers lexicographically
48 Square but not cube
48 Zebra puzzle  
47 Append a record to the end of a text file
47 Echo server    
47 Execute a Markov algorithm  
47 History variables  
47 Hofstadter Figure-Figure sequences
47 Kronecker product
47 Longest string challenge  
47 Stable marriage problem  
47 Visualize a tree
46 Associative array/Merging  
46 Average loop length
46 Bitmap/Flood fill  
46 Determine if only one instance is running  
46 Egyptian division
46 Narcissist
46 Set consolidation
46 Verify distribution uniformity/Naive
46 Water collected between towers
45 Active object  
45 Bulls and cows/Player
45 Determine if a string has all unique characters
45 Element-wise operations
45 Image noise
45 McNuggets problem
45 OpenGL  
45 Parsing/Shunting-yard algorithm
45 Rosetta Code/Count examples      
45 Send an unknown method call  
45 Sorting algorithms/Radix sort
45 Ulam spiral (for primes)
44 Carmichael 3 strong pseudoprimes
44 Doubly-linked list/Definition  
44 Elementary cellular automaton
44 GUI/Maximum window dimensions
44 Generate Chess960 starting position
44 Sparkline in unicode
44 Subtractive generator
44 Sum to 100
43 Atomic updates  
43 Bitmap/Read a PPM file    
43 Cantor set
43 Gapful numbers
43 Hickerson series of almost integers
43 Keyboard input/Flush the keyboard buffer  
43 Knapsack problem/Bounded
43 MD5/Implementation
43 Percentage difference between images  
43 Spinning rod animation/Text
43 Taxicab numbers
43 Truth table
42 Aliquot sequence classifications
42 Calendar - for "REAL" programmers    
42 Currency
42 Digital root/Multiplicative digital root
42 Nim game
42 Permutations/Derangements
42 S-expressions  
42 Secure temporary file  
42 Sorting Algorithms/Circle Sort
42 Table creation/Postal addresses    
42 Terminal control/Dimensions    
42 Text between
42 Twelve statements  
42 Van Eck sequence
42 Voronoi diagram
41 Balanced ternary
41 Bitmap/Midpoint circle algorithm    
41 Combinations and permutations
41 Deepcopy
41 Fivenum
41 Flipping bits game  
41 Fusc sequence
41 Hilbert curve
41 Parallel calculations  
41 Pascal's triangle/Puzzle
41 Problem of Apollonius
41 Remove vowels from a string
41 Sort a list of object identifiers
41 Sorting algorithms/Strand sort
41 Speech synthesis    
41 Start from a main routine    
41 UTF-8 encode and decode
41 Variable size/Set  
40 Casting out nines
40 Chowla numbers
40 Color of a screen pixel
40 Euler's identity
40 GUI enabling/disabling of controls  
40 Inverted index  
40 Primorial numbers
40 Recaman's sequence
40 Sailors, coconuts and a monkey problem
40 Scope/Function names and labels  
40 Summarize and say sequence
40 The Name Game
40 Topswops
40 Variable-length quantity
39 Abbreviations, automatic
39 Bell numbers
39 Brace expansion
39 Colour pinstripe/Display
39 Cramer's rule
39 Create a file on magnetic tape  
39 Julia set  
39 Knuth's algorithm S
39 Magic squares of doubly even order
39 Musical scale    
39 Order disjoint list items  
39 Parametric polymorphism    
39 Parsing/RPN to infix conversion
39 Permutation test
39 Permutations by swapping
39 Permutations with repetitions
39 Prime conspiracy
39 Ray-casting algorithm
39 Two identical strings      
38 Brazilian numbers
38 Break OO privacy  
38 Constrained genericity      
38 Cuban primes
38 Days between dates
38 Feigenbaum constant calculation
38 Kahan summation
38 LU decomposition
38 MAC Vendor Lookup
38 Metered concurrency
38 Pathological floating point problems
38 Pythagorean quadruples
38 QR decomposition    
38 Ranking methods
38 Read a file character by character/UTF8
38 Statistics/Normal distribution
38 Totient function
37 21 game    
37 Abbreviations, easy
37 File extension is in extensions list
37 Find palindromic numbers in both binary and ternary bases
37 Find the intersection of a line with a plane
37 Function prototype    
37 Input/Output for lines of text
37 Input/Output for pairs of numbers
37 Long primes
37 Loops/Wrong ranges
37 Lychrel numbers  
37 MD4
37 Metronome
37 Object serialization  
37 Penney's game
37 Solve the no connection puzzle
37 Substitution cipher
37 Terminal control/Hiding the cursor  
37 Terminal control/Inverse video  
37 Test integerness
37 Vampire number
36 Abbreviations, simple
36 Approximate equality
36 Bitwise IO  
36 Convex hull
36 Determine if a string is squeezable
36 Display a linear combination
36 Egyptian fractions
36 Events    
36 Fibonacci word/fractal  
36 Floyd-Warshall algorithm  
36 Humble numbers
36 Idiomatically determine all the lowercase and uppercase letters
36 Largest number divisible by its digits
36 Loops/With multiple ranges
36 Maze solving  
36 Minesweeper game    
36 Multiple regression
36 Numerical integration/Gauss-Legendre Quadrature
36 Pinstripe/Display
36 RIPEMD-160
36 Rosetta Code/Find bare lang tags      
36 Sutherland-Hodgman polygon clipping  
36 Terminal control/Unicode output    
35 Arithmetic-geometric mean/Calculate Pi
35 Bitmap/Bézier curves/Cubic    
35 Check output device is a terminal    
35 Entropy/Narcissist
35 Isqrt (integer square root) of X
35 Multiline shebang      
35 Ordered partitions  
35 Parametrized SQL statement  
35 Pentagram
35 Safe primes and unsafe primes
35 Square-free integers
34 Conjugate transpose  
34 Mutex    
34 Pattern matching      
34 Primality by Wilson's theorem  
34 RSA code
34 Subset sum problem
33 Cheryl's birthday
33 Continued fraction/Arithmetic/Construct from rational number
33 Executable library  
33 Factorions  
33 Integer roots
33 Mertens function  
33 Multi-dimensional array
33 Negative base numbers
33 Old Russian measure of length
33 Parse command-line arguments  
33 Partition an integer x into n primes
33 Poker hand analyser
33 Pythagoras tree  
33 Resistor mesh
33 Set puzzle
33 Solve a Hidato puzzle
33 Sorting algorithms/Patience sort
33 Topic variable    
32 Bioinformatics/base count
32 Bitcoin/address validation  
32 Bitmap/Bézier curves/Quadratic    
32 Check input device is a terminal  
32 Church numerals    
32 Decimal floating point number to binary  
32 Determine if two triangles overlap  
32 Eban numbers
32 Execute SNUSP
32 Four is magic
32 Galton box animation  
32 Lah numbers
32 Multiplicative order
32 Rosetta Code/Find unimplemented tasks        
32 Sequence: smallest number with exactly n divisors
32 Set of real numbers
32 Straddling checkerboard
32 Textonyms
32 Type detection
32 Use another language to call a function      
32 Write to Windows event log  
31 Apply a digital filter (direct form II transposed)  
31 Bitmap/Histogram    
31 Cycle detection
31 Faulhaber's formula
31 Faulhaber's triangle
31 First class environments  
31 Keyboard macros  
31 Modular arithmetic
31 Numeric error propagation
31 Palindrome dates  
31 Perfect totient numbers
31 Reflection/List properties    
31 Simple database  
31 Terminal control/Cursor movement  
31 URL parser    
30 Chaocipher
30 Chat server    
30 Check Machin-like formulas    
30 Checkpoint synchronization  
30 Deconvolution/1D
30 Dice game probabilities
30 Diversity prediction theorem
30 Draw a rotating cube  
30 FTP  
30 HTTPS/Authenticated    
30 Implicit type conversion
30 Koch curve  
30 Length of an arc between two angles
30 Mersenne primes
30 Mian-Chowla sequence
30 Parallel brute force  
30 Pragmatic directives  
30 Rosetta Code/Fix code tags      
30 Sequence: smallest number greater than previous term with exactly n divisors
30 Stream merge
30 Terminal control/Preserve screen
30 Window creation/X11  
30 Xiaolin Wu's line algorithm  
30 Zhang-Suen thinning algorithm
29 Arena storage pool      
29 Bacon cipher
29 Death Star    
29 Decision tables
29 Find first and last set bit of a long integer
29 Gauss-Jordan matrix inversion  
29 Jacobi symbol
29 Memory layout of a data structure  
29 Sexy primes
29 Smarandache prime-digital sequence  
29 State name puzzle
29 Strong and weak primes
29 Tau number    
29 Update a configuration file
29 Verify distribution uniformity/Chi-squared test
29 Word break problem  
28 AVL tree    
28 Burrows–Wheeler transform
28 Chemical calculator
28 Compiler/lexical analyzer    
28 Extra primes
28 Find largest left truncatable prime in a given base
28 First power of 2 that has leading decimal digits of 12
28 Formal power series  
28 Honeycombs    
28 Longest common suffix
28 Machine code      
28 Peano curve  
28 Perlin noise
28 Polyspiral  
28 Ramsey's theorem
28 Sorting algorithms/Cycle sort
28 Sum and product puzzle
28 Super-d numbers
28 Thiele's interpolation formula
28 Yellowstone sequence
27 Active Directory/Connect    
27 Angles (geometric), normalization and conversion
27 Chebyshev coefficients
27 Create an object at a given address      
27 Cut a rectangle
27 Go Fish    
27 Law of cosines - triples
27 Natural sorting    
27 Nautical bell  
27 Palindromic gapful numbers  
27 Paraffins
27 Range consolidation
27 Reflection/List methods    
27 Safe addition
27 Same fringe    
27 Solve a Holy Knight's tour  
27 Superellipse
27 Table creation        
27 The ISAAC Cipher
27 Weird numbers
27 World Cup group stage
27 Zumkeller numbers  
26 Birthday problem
26 Card shuffles
26 Distributed programming        
26 Fairshare between two and more
26 Fermat numbers
26 First perfect square in base n with n unique digits  
26 Image convolution  
26 Kronecker product based fractals
26 Möbius function  
26 N-smooth numbers
26 Nonoblock
26 Numbers with prime digits whose sum is 13  
26 Plasma effect  
26 Ramer-Douglas-Peucker line simplification
26 Sequence of primorial primes
26 Successive prime differences
26 Tau function    
25 A* search algorithm    
25 Abelian sandpile model  
25 Color wheel  
25 Elliptic curve arithmetic
25 Fraction reduction  
25 Function frequency      
25 Generate random chess position
25 Idiomatically determine all the characters that can be used for symbols  
25 Intersecting number wheels
25 Magic squares of singly even order
25 Minimum positive multiple in base 10 using only 0 and 1  
25 Monads/Maybe monad      
25 Parse an IP Address
25 Pell's equation
25 Pierpont primes
25 Play recorded sounds          
25 RCRPG    
25 Sierpinski pentagon    
25 Stirling numbers of the first kind
25 Stirling numbers of the second kind
25 Teacup rim text  
25 Tonelli-Shanks algorithm
25 Unprimeable numbers
25 Welch's t-test
25 Words containing "the" substring      
25 Yahoo! search interface      
24 Audio alarm        
24 Cipolla's algorithm
24 Circular primes
24 Find words with alternating vowels and consonants    
24 Finite state machine
24 Hough transform  
24 Hunt the Wumpus      
24 K-means++ clustering    
24 Linux CPU utilization  
24 List rooted trees
24 Mayan numerals  
24 Mind boggling card trick  
24 Numbers divisible by their individual digits, but not by the product of their digits.        
24 Numbers with equal rises and falls    
24 Percolation/Mean run density  
24 Permutations/Rank of a permutation
24 Shortest common supersequence
24 Simulate input/Keyboard      
24 Strange plus numbers
24 Sum of divisors  
24 Superpermutation minimisation
24 Total circles area
23 Alternade words  
23 Base58Check encoding  
23 Bin given limits  
23 Create an object/Native demonstration  
23 Deming's Funnel  
23 Elementary cellular automaton/Random Number Generator  
23 Find words which contains more than 3 e vowels    
23 Fixed length records        
23 Kolakoski sequence
23 Lucky and even lucky numbers
23 Main step of GOST 28147-89  
23 Make a backup file    
23 Markov chain text generator  
23 Next highest int from digits
23 Playfair cipher  
23 Record sound      
23 Reverse the gender of a string  
23 SOAP    
23 Shift list elements to left by 3    
23 Solve a Hopido puzzle  
23 Sorting algorithms/Cocktail sort with shifting bounds  
23 Strange unique prime triplets    
23 Video display modes      
22 Active Directory/Search for a user      
22 Commatizing numbers  
22 Cousin primes    
22 De Bruijn sequences  
22 Find duplicate files      
22 Increasing gaps between consecutive Niven numbers  
22 Long literals, with continuations    
22 Magnanimous numbers    
22 Matrix chain multiplication
22 Pig the dice game/Player      
22 Primes which sum of digits is 25      
22 Pseudo-random numbers/PCG32
22 Random Latin squares  
22 Snake and Ladder  
22 Sokoban
22 Solve a Numbrix puzzle  
22 Spelling of ordinal numbers
21 ASCII art diagram converter    
21 Data Encryption Standard
21 Eertree  
21 Esthetic numbers  
21 Joystick position          
21 Kosaraju  
21 Levenshtein distance/Alignment
21 Mastermind      
21 Median filter    
21 Monads/List monad      
21 Native shebang      
21 Numeric separator syntax  
21 Orbital elements
21 Padovan sequence    
21 Product of divisors    
21 Pseudo-random numbers/Xorshift star
21 Reflection/Get source    
21 Self numbers
21 Sum data type    
21 UPC
21 Window management    
21 Word wheel    
20 Addition chains  
20 Assertions in design by contract      
20 Bioinformatics/Sequence mutation  
20 Bitcoin/public point to address      
20 Cistercian numerals  
20 Index finite lists of positive integers  
20 K-d tree    
20 Nested templated data        
20 Polynomial synthetic division  
20 Ulam numbers  
20 Vigenère cipher/Cryptanalysis
20 Vogel's approximation method  
19 15 puzzle solver          
19 ABC words    
19 Abelian sandpile model/Identity        
19 Bilinear interpolation  
19 Code segment unload  
19 Color quantization    
19 Common sorted list      
19 Elementary cellular automaton/Infinite length    
19 Exponentiation with infix operators in (or operating on) the base      
19 Knuth's power tree  
19 Line circle intersection  
19 Metallic ratios  
19 Montgomery reduction
19 N-body problem  
19 Names to numbers    
19 Odd words      
19 P-value correction
19 Pancake numbers  
19 Perceptron      
19 Percolation/Site percolation  
19 Primes - allocate descendants to their ancestors
19 Print debugging statement
19 Readline interface
19 Selective file copy    
19 Sierpinski arrowhead curve      
19 Simulate input/Mouse      
19 Strange numbers    
19 Sunflower fractal    
19 Untrusted environment      
18 Arithmetic coding/As a generalized change of radix    
18 Canonicalize CIDR  
18 Change e letters to i in words        
18 Changeable words  
18 Compiler/code generator    
18 Draw pixel 2  
18 EKG sequence convergence
18 File size distribution    
18 Find URI in text        
18 Imaginary base numbers
18 Monads/Writer monad      
18 Nice primes    
18 Nimber arithmetic  
18 Partition function P  
18 Rare numbers      
18 SQL-based authentication  
18 Solve triangle solitare puzzle  
18 Transportation problem        
18 Twin primes  
18 Zeckendorf arithmetic  
17 Biorhythms      
17 Bitmap/Read an image through a pipe      
17 Compiler/virtual machine interpreter      
17 Find if a point is within a triangle
17 Find prime numbers of the form n*n*n+2      
17 Find words which contains all the vowels        
17 Find words which first and last three letters are equals        
17 Just in time processing on a character stream  
17 Latin Squares in reduced form  
17 Matrix digital rain      
17 Most frequent k chars distance    
17 NYSIIS  
17 Nonogram solver      
17 Particle swarm optimization  
17 Percolation/Bond percolation  
17 Percolation/Mean cluster density  
17 Prime words        
17 Proof            
17 Retrieve and search chat history      
17 Separate the house number from the street name    
17 Show the (decimal) value of a number of 1s appended with a 3, then squared          
17 Suffix tree  
16 Additive primes        
16 Aspect oriented programming  
16 Bitmap/PPM conversion through a pipe      
16 Calkin-Wilf sequence      
16 Chernick's Carmichael numbers  
16 Free polyominoes enumeration      
16 Getting the number of decimals
16 HTTPS/Client-authenticated      
16 Padovan n-step number sequences    
16 Peaceful chess queen armies
16 Piprimes          
16 Pseudo-random numbers/Splitmix64    
16 Ramanujan's constant    
16 Self-hosting compiler        
16 Sequence: nth number with exactly n divisors  
16 Snake    
16 Tarjan  
16 Terminal control/Positional read    
16 Vibrating rectangles      
16 Word search    
15 Compiler/syntax analyzer      
15 Cyclotomic polynomial    
15 Erdős-primes      
15 Find prime n for that reversed n is also prime        
15 Four is the number of letters in the ...
15 Functional coverage tree    
15 Geometric algebra      
15 Logistic curve fitting in epidemiology
15 Merge and aggregate datasets      
15 Numerical integration/Adaptive Simpson's method
15 OpenWebNet password    
15 Rendezvous          
15 Singly-linked list/Element removal    
15 Smallest power of 6 whose decimal expansion contains n      
15 Square root by hand    
15 Words from neighbour ones    
14 Compare sorting algorithms' performance        
14 Compiler/AST interpreter      
14 Find words which contains most consonants        
14 Generalised floating point addition    
14 Gradient descent        
14 Jaro-Winkler distance      
14 Permutations with some identical elements        
14 SHA-256 Merkle tree  
14 Topological sort/Extracted top item
14 XML validation    
13 Banker's algorithm    
13 Common list elements        
13 Deconvolution/2D+      
13 Factorial base numbers indexing permutations of a collection        
13 Find first missing positive        
13 Next special primes      
13 Odd squarefree semiprimes            
13 Pisano period    
13 Print itself      
13 Pseudo-random numbers/Combined recursive generator MRG32k3a    
13 Sine wave        
12 Canny edge detector          
12 Consecutive Primes With Ascending Or Descending Differences            
12 Continued fraction/Arithmetic/G(matrix ng, continued fraction n)        
12 Greed      
12 Interactive help        
12 Launch rocket with countdown and acceleration in stdout        
12 Longest palindromic substrings      
12 Minimal steps down to 1    
12 Run as a daemon or service            
12 Safe mode          
12 Sierpinski curve        
12 Simulated annealing          
12 Smallest square that begins with n        
12 Sorting algorithms/Tree sort on a linked list      
12 Tetris        
12 Two bullet roulette  
12 VList        
12 XXXX redacted      
11 Almkvist-Giullera formula for pi      
11 Audio frequency generator            
11 Catmull–Clark subdivision surface          
11 Checksumcolor        
11 Frobenius numbers            
11 Geohash      
11 Minkowski question-mark function      
11 Modified random distribution      
11 One-time pad    
11 Pentomino tiling      
11 Primes with digits in nondecreasing order            
11 Railway circuit      
11 Resistance calculator      
11 Sierpinski square curve        
11 Substring primes            
11 Text completion      
11 Tree from nesting levels      
11 Unit testing          
11 Untouchable numbers        
11 Using a speech engine to highlight words            
10 Bioinformatics/Subsequence        
10 Colour pinstripe/Printer          
10 Combinations with repetitions/Square digit chain      
10 Execute CopyPasta Language      
10 External sort        
10 Faces from a mesh      
10 French Republican calendar      
10 Non-transitive dice        
10 Penrose tiling      
10 Pinstripe/Printer            
10 Powerful numbers      
10 Special factorials        
10 Spoof game      
10 Suffixation of decimal numbers      
10 Three word location      
10 Time-based one-time password algorithm            
10 Tree datastructures      
9 Curve that touches three points        
9 Display an outline as a nested table        
9 Fibonacci matrix-exponentiation        
9 Graph colouring        
9 Hourglass puzzle      
9 IPC via named pipe            
9 Morpion solitaire          
9 Palindromic primes          
9 Parse EBNF            
9 Pseudorandom number generator image      
9 Quadrat Special Primes          
9 Quoting constructs          
9 Range modifications      
9 Resistance network calculator      
9 Rosetta Code/Rank languages by number of users            
9 Rosetta Code/Tasks without examples        
9 Sort an outline at every level        
9 Starting a web browser          
9 Text to HTML        
9 User defined pipe and redirection operators          
9 War card game      
8 Continued fraction/Arithmetic/G(matrix ng, continued fraction n1, continued fraction n2)        
8 Count the coins/0-1        
8 Cubic Special Primes          
8 Elliptic Curve Digital Signature Algorithm        
8 Multidimensional Newton-Raphson method        
8 Numbers which binary and ternary digit sum are prime            
8 Numerical and alphabetical suffixes          
8 Practical numbers          
8 Robots        
8 Square Form Factorization        
7 16 puzzle game            
7 Brace expansion using ranges        
7 Compiler/Verifying syntax        
7 Doubly-linked list/Element removal          
7 Fibonacci heap        
7 Mayan calendar        
7 OpenGL/Utah Teapot          
7 P-Adic numbers, basic          
7 Random sentence from book          
7 Recursive descent parser generator          
7 URL shortener            
6 Bioinformatics/global alignment        
6 Distinct Palindromes Within Decimal Numbers            
6 I'm a software engineer, get me out of here          
6 OpenGL pixel shader              
6 Price list behind API        
6 Remote agent/Agent logic            
6 Remote agent/Simulation            
6 Rosetta Code/Run examples                
6 Smallest enclosing circle problem        
6 Smallest numbers                
6 Special Divisors            
6 Terminal control/Restricted width positional input/No wrapping          
6 Terminal control/Restricted width positional input/With wrapping          
5 Addition-chain exponentiation              
5 Audio overlap loop                
5 Black Box              
5 Boids          
5 Chess player            
5 Hexapawn              
5 P-Adic square roots              
5 Process SMIL directives in XML data            
5 Raster bars            
5 Remote agent/Agent interface              
5 Solve a Rubik's Cube          
5 Strassen's algorithm          
5 Tamagotchi emulator                
5 Waveform analysis/Doh ray me          
4 Generalised floating point multiplication              
4 Latin Squares in reduced form/Randomizing using Jacobson and Matthews’ Technique              
4 OLE automation                
4 Solving coin problems            
4 Unicode polynomial equation            
4 Using the Meetup.com API              
4 Weather routing            
4 WiktionaryDumps to words              
3 Rosetta Code/List authors of task descriptions              
3 Ukkonen’s suffix tree construction              
3 Vidir                
3 Waveform analysis/Top and tail              
2 15 puzzle game in 3D                  
2 CLI-based maze-game                  
2 IRC gateway                  
1 Blackjack strategy