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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.

Languages that omit a certain task have an uppercase O filled in for that task.

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 Phix          ② Go            ③ Julia         ④ Raku          ⑤ Nim          
    ⑥ Wren          ⑦ Perl          ⑧ Python        ⑨ C             ⑩ REXX         
As of 2021-09-19T20:23:40Z :: Tasks: 1138 :: Draft Tasks:303 :: Total Tasks: 1441 :: Total Examples: 79871
Count Task
500 Hello world/Text
332 99 bottles of beer
325 FizzBuzz
320 100 doors
296 Fibonacci sequence
291 Factorial
279 Comments
269 A+B
263 Empty program
242 Function definition
234 Loops/Infinite
229 Arrays
228 Loops/While
228 Reverse a string
226 Ackermann function
211 Loops/For
207 Conditional structures
204 Greatest common divisor
200 Arithmetic/Integer
198 Greatest element of a list
192 Array concatenation
191 Even or odd
186 Averages/Arithmetic mean
186 Integer comparison
185 Repeat a string
183 Increment a numerical string
179 Hello world/Graphical
177 Copy a string
177 Sieve of Eratosthenes
171 Boolean values
170 Loops/Downward for
169 Array length
169 Binary digits
169 Towers of Hanoi
168 Character codes
168 String concatenation
167 Apply a callback to an array
166 Integer sequence
166 Loops/Do-while
165 Hello world/Newline omission
165 Loops/For with a specified step
165 Palindrome detection
164 Loops/Foreach
164 Loops/N plus one half
164 Rot-13
164 Sum and product of an array
163 String length
161 Loops/Break
161 String case
161 Sum of a series
161 Tokenize a string
158 Quine
157 Dot product
157 Generic swap
157 Leap year
156 Empty string
155 Hailstone sequence
155 Sum of squares
154 Logical operations
153 Filter
152 Associative array/Creation
152 Sort an integer array
151 Sorting algorithms/Bubble sort
149 Factors of an integer
147 Execute a system command
146 Remove duplicate elements
146 Roman numerals/Encode
145 Caesar cipher
144 Guess the number
144 Loop over multiple arrays simultaneously
144 System time
143 Determine if a string is numeric
143 Higher-order functions
141 Sorting algorithms/Quicksort
141 User input/Text
140 File input/output
140 Luhn test of credit card numbers
140 Primality by trial division
140 Stack
138 Bitwise operations
138 Hello world/Standard error
137 Day of the week
135 Command-line arguments
135 Happy numbers
135 Loops/Continue
135 Read entire file
135 Substring
134 Create a file
134 Generate lower case ASCII alphabet
134 Mutual recursion
134 Zero to the zero power
132 Check that file exists
132 Sleep
131 Least common multiple
131 Pascal's triangle
130 Flatten a list
130 Literals/String
129 ABC problem
129 Date format
127 Balanced brackets
127 Mandelbrot set
127 Program termination
127 Variables
126 Ethiopian multiplication
125 Compound data type
125 Literals/Integer
124 Binary search
124 Function composition
124 Include a file
123 Count in octal
123 Detect division by zero
123 Formatted numeric output
123 Knuth shuffle
122 Associative array/Iteration
122 Count occurrences of a substring
122 Roman numerals/Decode
121 Averages/Root mean square
121 Loops/Nested
121 N-queens problem
121 Sorting algorithms/Insertion sort
120 Null object
119 Anagrams
119 Case-sensitivity of identifiers
119 Haversine formula
119 Read a file line by line
118 Pick random element
117 Identity matrix
117 Matrix transposition
117 Multiplication tables
117 Real constants and functions
117 Search a list
116 Classes O
116 Guess the number/With feedback
116 Hash from two arrays
116 Matrix multiplication
115 Averages/Median
115 Babbage problem
115 Delete a file
115 File size
115 Letter frequency
115 String matching
114 Align columns
114 Environment variables
114 Find limit of recursion
114 Look-and-say sequence
114 Perfect numbers
114 Rename a file
114 Return multiple values
113 Assertions
113 Conway's Game of Life
113 HTTP
113 Input loop
112 Pangram checker
112 Random numbers
111 Arithmetic/Complex
111 Catalan numbers
111 Hostname
110 Infinity
110 Sierpinski triangle
109 Accumulator factory
109 Evaluate binomial coefficients
108 Strip a set of characters from a string
108 Temperature conversion
107 Arithmetic-geometric mean
107 Horner's rule for polynomial evaluation
107 Levenshtein distance
107 Permutations
107 Reverse words in a string
107 String append
107 Substring/Top and tail
107 Variadic function
106 Averages/Pythagorean means
106 Program name
106 Run-length encoding
105 Anonymous recursion
105 Comma quibbling
105 Prime decomposition
105 Zig-zag matrix
104 Bulls and cows
104 Nth root
104 Regular expressions
104 String interpolation (included)
104 Strip whitespace from a string/Top and tail
103 Exceptions
103 Sorting algorithms/Merge sort
103 Sum multiples of 3 and 5
103 Trigonometric functions
102 Combinations
102 Harshad or Niven series
102 Queue/Definition
102 Sorting algorithms/Selection sort
101 Ordered words
101 The Twelve Days of Christmas
100 Call a function
100 Create a two-dimensional array at runtime
100 Middle three digits
100 N'th
100 Power set
100 Shell one-liner
100 Short-circuit evaluation
100 Sierpinski carpet
100 Sum digits of an integer
100 Vector products
99 24 game
99 Arbitrary-precision integers (included)
99 String prepend
98 Digital root
97 Interactive programming O
97 Range extraction
97 Sorting algorithms/Gnome sort
97 Walk a directory/Non-recursively
97 Y combinator
96 Range expansion
95 Abundant, deficient and perfect number classifications
95 Collections
95 Enumerations
95 Execute Brain****
94 First-class functions
94 Sequence of non-squares
94 Time a function
93 Evolutionary algorithm
93 Exponentiation operator
93 Hello world/Newbie
93 One-dimensional cellular automata
93 Sorting algorithms/Cocktail sort
92 Averages/Mode
92 Create an HTML table
92 Dragon curve
92 Inheritance/Single
92 MD5
92 Random number generator (included)
92 Sort using a custom comparator
91 Cumulative standard deviation
91 Hofstadter Q sequence
91 Number names
91 Sorting algorithms/Bogosort
90 Amicable pairs
90 Forward difference
90 JSON
90 Langton's ant
90 Monty Hall problem
90 Symmetric difference
89 Averages/Simple moving average
89 Hamming numbers
89 Josephus problem
89 Price fraction
89 String comparison
88 Calculating the value of e
88 Entropy
88 Gray code
88 Number reversal game
88 Simple windowed application
88 Tree traversal
87 Catamorphism
87 Five weekends
87 Greatest subsequential sum
87 Map range
87 Sorting algorithms/Heapsort
86 Abstract type
86 CSV data manipulation
86 Compare a list of strings
86 Menu
85 Almost prime
85 CSV to HTML translation
85 Floyd's triangle
85 Queue/Usage
85 Terminal control/Clear the screen
85 Walk a directory/Recursively
84 Last Friday of each month
84 SEDOLs
84 Sort an array of composite structures
84 Window creation
83 Closures/Value capture
83 Count in factors
83 Monte Carlo methods
83 Non-decimal radices/Convert
83 URL decoding
82 File modification time
82 Introspection
82 Set
82 Terminal control/Ringing the terminal bell
82 Word wrap
81 Address of a variable
81 Bitmap
81 Box the compass
81 Find the last Sunday of each month
81 Operator precedence
81 Order two numerical lists
81 Read a specific line from a file
81 Repeat
81 Sorting algorithms/Shell sort
81 Top rank per group
80 CRC-32
80 Hello world/Line printer
80 Here document O
80 Literals/Floating point
80 Long multiplication
80 Lucas-Lehmer test
80 Roots of unity
80 Show ASCII table
80 Web scraping
79 Concurrent computing
79 Count the coins
79 Find common directory path
79 Jensen's Device
79 Munchausen numbers
79 Playing cards
79 Pythagorean triples
79 Show the epoch
79 Singly-linked list/Traversal
79 Sockets
79 Sorting algorithms/Counting sort
79 Spiral matrix
79 Split a character string based on change of character
79 XML/Input
78 Anti-primes
78 Date manipulation
78 Dynamic variable names O
78 Linear congruential generator
78 Multifactorial
78 Soundex
78 URL encoding
77 Call an object method O
77 Find the missing permutation
77 Kaprekar numbers
77 Knapsack problem/0-1
77 Proper divisors
77 Strip comments from a string
76 Averages/Mean angle
76 Empty directory
76 Keyboard input/Obtain a Y or N response
76 Modular inverse
76 Phrase reversals
76 Population count
76 Semordnilap
76 Sorting algorithms/Comb sort
76 Sudoku
75 Calendar
75 Hello world/Web server
75 Man or boy test
75 Non-decimal radices/Output
75 Pi
75 Unicode variable names
74 AKS test for primes
74 Anagrams/Deranged anagrams
74 Equilibrium index
74 Fibonacci n-step number sequences
74 Gamma function
74 List comprehensions
74 Parsing/RPN calculator algorithm
74 Read a configuration file
74 SHA-1
74 Special characters
74 Take notes on the command line
74 Vigenère cipher
74 Write entire file
73 Animation
73 Enforced immutability
73 Exceptions/Catch an exception thrown in a nested call
73 Execute HQ9+
73 Flow-control structures
73 Multiple distinct objects
73 Rock-paper-scissors
73 Singly-linked list/Element definition
73 Sort disjoint sublist
73 Stair-climbing puzzle
72 Convert seconds to compound duration
72 Four bit adder
72 Guess the number/With feedback (player)
72 Quaternion type
72 Rep-string
72 SHA-256
72 Thue-Morse
72 Zeckendorf number representation
71 15 puzzle game
71 Call a foreign-language function
71 Combinations with repetitions
71 Currying
71 Euler's sum of powers conjecture
71 Fractal tree
71 Horizontal sundial calculations
71 Jump anywhere
71 Longest common subsequence
71 Polymorphism
70 Bitmap/Bresenham's line algorithm
70 Closest-pair problem
70 Extend your language
70 IBAN
70 Largest int from concatenated ints
70 Named parameters
70 Numerical integration
70 Old lady swallowed a fly
70 Pernicious numbers
70 Priority queue
70 Sorting algorithms/Stooge sort
70 Trabb Pardo–Knuth algorithm
70 Write float arrays to a text file
69 Benford's law
69 Catalan numbers/Pascal's triangle
69 Constrained random points on a circle
69 Draw a sphere
69 Fork
69 Magic squares of odd order
69 Maze generation
69 Nested function
69 Self-describing numbers
69 Sorting algorithms/Pancake sort
69 Text processing/Max licenses in use
69 Van der Corput sequence
68 Barnsley fern
68 Department numbers
68 Euler method
67 Amb
67 Arithmetic/Rational
67 Chinese remainder theorem
67 Fast Fourier transform
67 Hofstadter-Conway $10,000 sequence
67 Morse code
67 Narcissistic decimal number
67 Remove lines from a file
67 Roots of a function
67 Runtime evaluation O
67 Sequence of primes by trial division
67 Sort stability
67 Special variables
67 Square but not cube
67 Unix/ls
66 Circles of given radius through two points
66 Documentation
66 General FizzBuzz
66 Inheritance/Multiple
66 One of n lines in a file
66 Optional parameters
66 Sort three variables
66 Strip control codes and extended characters from a string
66 Variable size/Get
65 100 prisoners
65 Continued fraction
65 HTTPS
65 Memory allocation
65 Roots of a quadratic function
65 Tic-tac-toe
65 Write language name in 3D ASCII
65 XML/Output
65 Yin and yang
64 Angle difference between two bearings
64 Attractive numbers
64 Damm algorithm
64 Factors of a Mersenne number
64 Jewels and stones
64 Modular exponentiation
64 Plot coordinate pairs
64 Reduced row echelon form
64 Singly-linked list/Element insertion
64 Stern-Brocot sequence
64 Word frequency
63 Animate a pendulum
63 Best shuffle
63 Binary strings
63 Cholesky decomposition
63 Exponentiation order
63 Get system command output
63 Globally replace text in several files
63 Non-decimal radices/Input
63 Probabilistic choice
63 Semiprime
63 Undefined values
62 Abundant odd numbers
62 Arithmetic evaluation
62 Extract file extension
62 Generator/Exponential
62 Mouse position
62 Runge-Kutta method
62 Test a function
62 Truncatable primes
62 Van Eck sequence
61 24 game/Solve
61 Averages/Mean time of day
61 Cartesian product of two or more lists
61 Compile-time calculation O
61 Draw a clock
61 Emirp primes
61 Host introspection
61 Sorting algorithms/Sleep sort
61 Terminal control/Display an extended character
61 Two sum
61 User input/Graphical
60 2048
60 9 billion names of God the integer
60 Add a variable to a class instance at runtime O
60 Bitmap/Write a PPM file
60 CUSIP
60 Gapful numbers
60 Huffman coding
60 Integer overflow
60 Knapsack problem/Continuous
60 Knapsack problem/Unbounded
60 Longest common prefix
60 Miller–Rabin primality test
60 Partial function application
60 Sorting algorithms/Bead sort
60 Subleq
60 Unicode strings
59 4-rings or 4-squares puzzle
59 Brownian tree
59 Dutch national flag problem
59 JortSort
59 Knight's tour
59 Left factorials
58 Hash join
58 I before E except after C
58 Leonardo numbers
58 Long year
58 Ludic numbers
58 Mad Libs
58 Magic 8-ball
58 Odd word problem
58 Random number generator (device)
58 Stem-and-leaf plot
58 Ternary logic
58 Unbias a random generator
57 Deal cards for FreeCell
57 Define a primitive data type O
57 Delegates
57 Determine if a string has all the same characters
57 Doubly-linked list/Element definition
57 Draw a cuboid
57 Fibonacci word
57 ISBN13 check digit
57 LZW compression
57 Matrix-exponentiation operator
57 Multisplit
57 Pointers and references
57 Scope modifiers
57 Sierpinski triangle/Graphical
57 Singleton
57 Sorting algorithms/Permutation sort
57 Terminal control/Coloured text
57 Topological sort
57 Truncate a file
56 Base64 encode data
56 DNS query
56 Determine if a string is collapsible
56 Dinesman's multiple-dwelling problem
56 Discordian date
56 Extreme floating point values
56 Forest fire
56 Grayscale image
56 Modulinos
56 Pascal matrix generation
56 Quickselect algorithm
56 Rosetta Code/Rank languages by popularity
56 Stack traces
56 Terminal control/Cursor positioning
55 Chinese zodiac
55 Draw a pixel
55 Iterated digits squaring
55 Kernighans large earthquake problem
55 Keyboard input/Keypress check
55 Munching squares
55 Runtime evaluation/In an environment O
55 XML/XPath
54 Bernoulli numbers
54 FASTA format
54 Handle a signal
54 Inverted syntax
54 Loops/Increment loop index within loop body
54 Non-continuous subsequences
54 Perfect shuffle
54 Seven-sided dice from five-sided dice
54 Smith numbers
54 Synchronous concurrency
54 Universal Turing machine
54 Validate International Securities Identification Number
54 Vector
54 Wireworld
54 XML/DOM serialization
53 Base64 decode data
53 Call a function in a shared library
53 Convert decimal number to rational
53 Copy stdin to stdout
53 Dijkstra's algorithm
53 Dining philosophers
53 Heronian triangles
53 Longest common substring
53 Maximum triangle path sum
53 Polynomial regression
53 Sattolo cycle
53 Send email
53 Statistics/Basic
53 Strip block comments
53 Text processing/2
53 Tokenize a string with escaping
52 Associative array/Merging
52 First-class functions/Use numbers analogously O
52 Gaussian elimination
52 Holidays related to Easter
52 Longest increasing subsequence
52 McNuggets problem
52 Naming conventions
52 Password generator
52 Pig the dice game
52 Rate counter
52 Shoelace formula for polygonal area
52 Sort numbers lexicographically
51 Archimedean spiral
51 Cantor set
51 Chaos game
51 Farey sequence
51 Fractran
51 GUI component interaction
51 Longest string challenge
51 Make directory path
51 Move-to-front algorithm
51 Remove vowels from a string
51 Respond to an unknown method call O
50 Colour bars/Display
50 Determinant and permanent
50 Find the intersection of two lines
50 Jaro similarity
50 RPG attributes generator
50 Search a list of records
50 Stable marriage problem
50 Text processing/1
50 Two identical strings
50 Zebra puzzle
49 Determine if a string has all unique characters
49 Doubly-linked list/Element insertion
49 Doubly-linked list/Traversal
49 Echo server
49 Egyptian division
49 Extensible prime generator
49 Greyscale bars/Display
49 Hofstadter Figure-Figure sequences
49 Kronecker product
49 Last letter-first letter
49 Metaprogramming
49 Water collected between towers
48 Execute a Markov algorithm
48 Fusc sequence
48 History variables O
48 OpenGL
48 Polymorphic copy
48 Polynomial long division
48 Recaman's sequence
48 Sparkline in unicode
48 Verify distribution uniformity/Naive
48 Visualize a tree
47 Append a record to the end of a text file
47 Average loop length
47 Bitmap/Flood fill
47 Determine if only one instance is running
47 Generate Chess960 starting position
47 Narcissist
47 Nim game
47 Problem of Apollonius
47 Set consolidation
47 Ulam spiral (for primes)
46 Active object
46 Bell numbers
46 Determine if a string is squeezable
46 Element-wise operations
46 Image noise
46 Parsing/Shunting-yard algorithm
46 Sorting algorithms/Radix sort
46 Text between
45 Bulls and cows/Player
45 Carmichael 3 strong pseudoprimes
45 Currency
45 Days between dates
45 Doubly-linked list/Definition
45 Rosetta Code/Count examples
45 Secure temporary file
45 Send an unknown method call O O
45 Spinning rod animation/Text
45 Subtractive generator
45 Sum to 100
45 Taxicab numbers
45 Terminal control/Dimensions
45 The Name Game
45 Truth table
44 Abbreviations, automatic
44 Atomic updates
44 Bitmap/Read a PPM file
44 Deepcopy
44 Digital root/Multiplicative digital root
44 Elementary cellular automaton
44 Fivenum
44 Flipping bits game
44 GUI/Maximum window dimensions
44 Hickerson series of almost integers
44 Largest proper divisor of n
44 Percentage difference between images
44 Sorting Algorithms/Circle Sort
44 Speech synthesis
44 Sum of divisors
44 Sum of first n cubes
44 Twelve statements
43 Aliquot sequence classifications
43 Balanced ternary
43 Hilbert curve
43 Inverted index
43 Keyboard input/Flush the keyboard buffer
43 Knapsack problem/Bounded
43 MD5/Implementation
43 Musical scale
43 Permutations by swapping
43 Permutations/Derangements
43 Ranking methods
43 S-expressions
43 Sailors, coconuts and a monkey problem
43 Sort a list of object identifiers
43 Start from a main routine O
43 Summarize and say sequence
43 Table creation/Postal addresses
43 Totient function
43 UTF-8 encode and decode
43 Voronoi diagram
42 Bitmap/Midpoint circle algorithm
42 Calendar - for "REAL" programmers O
42 Color of a screen pixel
42 Combinations and permutations
42 Loops/With multiple ranges
42 Mertens function
42 Pascal's triangle/Puzzle
42 Permutations with repetitions
42 Tau number
42 Words containing "the" substring
41 21 game
41 Abbreviations, easy
41 Bioinformatics/base count
41 Casting out nines
41 Chowla numbers
41 Cycle detection
41 Euler's identity
41 GUI enabling/disabling of controls
41 Idiomatically determine all the lowercase and uppercase letters
41 Isqrt (integer square root) of X
41 Julia set
41 Long primes
41 Parallel calculations
41 Parametric polymorphism O O
41 Perfect totient numbers
41 Permutation test
41 Primality by Wilson's theorem
41 Prime conspiracy
41 Primorial numbers
41 Ray-casting algorithm
41 Scope/Function names and labels
41 Sorting algorithms/Strand sort
41 Sum of the digits of n is substring of n
41 Topswops
41 Variable size/Set
41 Variable-length quantity
40 Brace expansion
40 Brazilian numbers
40 Colour pinstripe/Display
40 Cramer's rule
40 Feigenbaum constant calculation
40 Humble numbers
40 Knuth's algorithm S
40 LU decomposition
40 Largest number divisible by its digits
40 Loops/Wrong ranges
40 Magic squares of doubly even order
40 Rosetta Code/Find bare lang tags
40 Statistics/Normal distribution
40 Terminal control/Hiding the cursor
39 Create a file on magnetic tape
39 Cuban primes
39 Display a linear combination
39 Events
39 File extension is in extensions list
39 Floyd-Warshall algorithm
39 Four is magic
39 Input/Output for lines of text
39 Kahan summation
39 MAC Vendor Lookup
39 Metered concurrency
39 Multiple regression
39 Order disjoint list items
39 Palindrome dates
39 Parsing/RPN to infix conversion
39 Penney's game
39 Pythagorean quadruples
39 QR decomposition
39 Read a file character by character/UTF8
39 Substitution cipher
39 Sutherland-Hodgman polygon clipping
39 Terminal control/Inverse video
39 Vampire number
38 Abbreviations, simple
38 Additive primes
38 Approximate equality
38 Break OO privacy O
38 Check output device is a terminal
38 Constrained genericity O O O
38 Convex hull
38 Coprimes
38 Fibonacci word/fractal
38 Find palindromic numbers in both binary and ternary bases
38 Find the intersection of a line with a plane
38 Function prototype O
38 Input/Output for pairs of numbers
38 Integer roots
38 Lychrel numbers
38 Maze solving
38 Metronome
38 Minesweeper game
38 Pathological floating point problems
38 Safe primes and unsafe primes
38 Solve the no connection puzzle
38 Tau function
38 Terminal control/Unicode output
38 Test integerness
37 Bitwise IO
37 MD4
37 Numbers divisible by their individual digits, but not by the product of their digits.
37 Object serialization O O
37 Pinstripe/Display
37 RSA code
37 Square-free integers
36 Cousin primes
36 Egyptian fractions
36 Lah numbers
36 Multiline shebang
36 Numerical integration/Gauss-Legendre Quadrature
36 Ordered partitions
36 Pentagram
36 Pythagoras tree
36 RIPEMD-160
36 Smallest square that begins with n
36 Subset sum problem
36 Yellowstone sequence
35 ABC words
35 Apply a digital filter (direct form II transposed)
35 Arithmetic-geometric mean/Calculate Pi
35 Base 16 numbers needing a to f
35 Bitmap/Bézier curves/Cubic
35 Determine if two triangles overlap
35 Entropy/Narcissist
35 Extra primes
35 Factorions
35 Frobenius numbers
35 Mutex
35 Nice primes
35 Parametrized SQL statement
35 Partition an integer x into n primes
35 Product of divisors
35 Sequence: smallest number with exactly n divisors
35 Sorting algorithms/Patience sort
35 Textonyms
35 Zumkeller numbers
34 Check input device is a terminal
34 Cheryl's birthday
34 Church numerals
34 Conjugate transpose
34 Diversity prediction theorem
34 Galton box animation
34 Multi-dimensional array
34 Old Russian measure of length
34 Pattern matching O O
34 Poker hand analyser
34 Primes which sum of digits is 25
34 Set puzzle
34 Solve a Hidato puzzle
34 Straddling checkerboard
34 Strange numbers
34 Topic variable O
33 Bacon cipher
33 Bitcoin/address validation
33 Chaocipher
33 Continued fraction/Arithmetic/Construct from rational number
33 Decimal floating point number to binary
33 Dice game probabilities
33 Eban numbers
33 Executable library
33 First power of 2 that has leading decimal digits of 12
33 Longest common suffix
33 Mian-Chowla sequence
33 Multiplicative order
33 Negative base numbers
33 Parse command-line arguments
33 Reflection/List properties O
33 Resistor mesh
33 Sorting algorithms/Cycle sort
33 Special Divisors
33 Strange plus numbers
33 Strong and weak primes
33 Terminal control/Cursor movement
33 Triplet of three numbers
33 Type detection
33 Use another language to call a function
33 Xiaolin Wu's line algorithm
32 Bitmap/Bézier curves/Quadratic
32 Bitmap/Histogram
32 Chat server
32 Compiler/lexical analyzer
32 Draw a rotating cube
32 Execute SNUSP
32 Faulhaber's formula
32 Faulhaber's triangle
32 Implicit type conversion
32 Length of an arc between two angles
32 Mersenne primes
32 Numbers with equal rises and falls
32 Pell's equation
32 Pragmatic directives
32 Rosetta Code/Find unimplemented tasks
32 Sequence: smallest number greater than previous term with exactly n divisors
32 Set of real numbers
32 Sexy primes
32 Simple database
32 Smarandache prime-digital sequence
32 Super-d numbers
32 Terminal control/Preserve screen
32 URL parser
32 Word break problem
32 Write to Windows event log
32 Zhang-Suen thinning algorithm
31 Arena storage pool
31 Burrows–Wheeler transform
31 Check Machin-like formulas
31 Checkpoint synchronization
31 Create an object at a given address O
31 FTP
31 Find prime numbers of the form n*n*n+2
31 Find words with alternating vowels and consonants
31 First class environments
31 Gauss-Jordan matrix inversion
31 Jacobi symbol
31 Keyboard macros
31 Koch curve
31 Modular arithmetic
31 Numbers which binary and ternary digit sum are prime
31 Numbers with prime digits whose sum is 13
31 Numeric error propagation
31 Parallel brute force
31 Rosetta Code/Fix code tags
31 Shift list elements to left by 3
31 State name puzzle
31 Stirling numbers of the first kind
31 Stirling numbers of the second kind
31 Strange unique prime triplets
31 Successive prime differences
31 Unique characters
31 Unprimeable numbers
31 Update a configuration file
31 Verify distribution uniformity/Chi-squared test
31 Weird numbers
31 Word wheel
30 AVL tree
30 Alternade words
30 Angles (geometric), normalization and conversion
30 Change e letters to i in words
30 Chemical calculator
30 Circular primes
30 Death Star
30 Decision tables
30 Deconvolution/1D
30 Fairshare between two and more
30 Find words which contains more than 3 e vowels
30 HTTPS/Authenticated
30 Peano curve
30 Perlin noise
30 Polyspiral
30 Range consolidation
30 Stream merge
30 Sum and product puzzle
30 Superellipse
30 Window creation/X11
29 Bin given limits
29 Chebyshev coefficients
29 Find first and last set bit of a long integer
29 Formal power series
29 Fraction reduction
29 Honeycombs
29 Law of cosines - triples
29 Machine code
29 Memory layout of a data structure
29 Minimum positive multiple in base 10 using only 0 and 1
29 Möbius function
29 Nonoblock
29 Plasma effect
29 Ramsey's theorem
29 Summarize primes
29 Superpermutation minimisation
29 Table creation
29 Thiele's interpolation formula
29 World Cup group stage
28 A* search algorithm
28 Active Directory/Connect
28 Birthday problem
28 Fermat numbers
28 Find largest left truncatable prime in a given base
28 First perfect square in base n with n unique digits
28 Generate random chess position
28 Go Fish
28 Hunt the Wumpus
28 Kronecker product based fractals
28 Mayan numerals
28 Monads/Maybe monad
28 Natural sorting
28 Nautical bell
28 Palindromic gapful numbers
28 Pierpont primes
28 Primes with digits in nondecreasing order
28 Reflection/List methods O
28 Same fringe
28 Show the (decimal) value of a number of 1s appended with a 3, then squared
28 Solve a Holy Knight's tour
28 Sorting algorithms/Cocktail sort with shifting bounds
28 The ISAAC Cipher
28 Tonelli-Shanks algorithm
27 Abelian sandpile model
27 Card shuffles
27 Color wheel
27 Common sorted list
27 Cut a rectangle
27 Distributed programming
27 Finite state machine
27 Image convolution
27 Long literals, with continuations
27 Magnanimous numbers
27 N-smooth numbers
27 Next highest int from digits
27 Paraffins
27 Partition function P
27 Ramer-Douglas-Peucker line simplification
27 Safe addition
27 Sequence of primorial primes
27 Sierpinski pentagon
27 Sum of elements below main diagonal of matrix
27 Teacup rim text
27 Twin primes
27 Welch's t-test
26 Audio alarm
26 Base58Check encoding
26 Bioinformatics/Sequence mutation
26 Cipolla's algorithm
26 Fixed length records
26 Function frequency
26 Hough transform
26 Idiomatically determine all the characters that can be used for symbols
26 Increasing gaps between consecutive Niven numbers
26 Intersecting number wheels
26 Kolakoski sequence
26 Magic squares of singly even order
26 Parse an IP Address
26 RCRPG
26 Random Latin squares
26 Shortest common supersequence
26 Snake and Ladder
26 UPC
26 Yahoo! search interface
25 Elliptic curve arithmetic
25 Find words whose first and last three letters are equal
25 K-means++ clustering
25 Linux CPU utilization
25 List rooted trees
25 Lucky and even lucky numbers
25 Make a backup file
25 Merge and aggregate datasets
25 Play recorded sounds
25 Playfair cipher
25 Pseudo-random numbers/PCG32
25 Simulate input/Keyboard
25 Total circles area
25 Video display modes O
24 Almkvist-Giullera formula for pi
24 De Bruijn sequences
24 Deming's Funnel
24 Distinct power numbers
24 Elementary cellular automaton/Random Number Generator
24 Esthetic numbers
24 Find prime n such that reversed n is also prime
24 Markov chain text generator
24 Matrix chain multiplication
24 Mind boggling card trick
24 Neighbour primes
24 Numbers in base 10 that are palindromic in bases 2, 4, and 16
24 Padovan sequence
24 Percolation/Mean run density
24 Permutations/Rank of a permutation
24 Piprimes
24 Reverse the gender of a string
24 Sokoban
24 Solve a Hopido puzzle
24 Solve a Numbrix puzzle
24 Words from neighbour ones
23 15 puzzle solver
23 Active Directory/Search for a user
23 Addition chains
23 Changeable words
23 Cistercian numerals
23 Commatizing numbers
23 Common list elements
23 Create an object/Native demonstration O
23 Exponentiation with infix operators in (or operating on) the base
23 Find duplicate files
23 Main step of GOST 28147-89
23 Monads/List monad
23 Nested templated data
23 Numbers with same digit set in base 10 and base 16
23 Numeric separator syntax
23 Orbital elements
23 Pig the dice game/Player
23 Pseudo-random numbers/Xorshift star
23 Record sound
23 SOAP
23 Self numbers
23 Spelling of ordinal numbers
23 Sylvester's sequence
23 Ulam numbers
22 ASCII art diagram converter
22 Assertions in design by contract
22 Bilinear interpolation
22 Calkin-Wilf sequence
22 Coprime triplets
22 Count how many vowels and consonants occur in a string
22 Data Encryption Standard
22 Doomsday rule
22 Eertree
22 File size distribution
22 Halt and catch fire
22 Kosaraju
22 Levenshtein distance/Alignment
22 Mastermind
22 Median filter
22 Montgomery reduction
22 Native shebang
22 Odd words
22 Order by pair comparisons
22 Perceptron
22 Polynomial synthetic division
22 Rare numbers
22 Reflection/Get source O
22 Sierpinski arrowhead curve
22 Smallest power of 6 whose decimal expansion contains n
22 Solve triangle solitare puzzle
22 Sunflower fractal
22 Vigenère cipher/Cryptanalysis
22 Vogel's approximation method
22 Wieferich primes
21 Abelian sandpile model/Identity
21 Arithmetic coding/As a generalized change of radix
21 Bitcoin/public point to address
21 Consecutive primes with ascending or descending dfferences
21 Elementary cellular automaton/Infinite length
21 Find if a point is within a triangle
21 Find minimum number of coins that make a given value
21 Find words which contains all the vowels
21 Index finite lists of positive integers
21 Joystick position O
21 K-d tree
21 Latin Squares in reduced form
21 Line circle intersection
21 N-body problem
21 Palindromic primes
21 Pancake numbers
21 Print debugging statement
21 Pseudo-random numbers/Combined recursive generator MRG32k3a
21 Readline interface
21 Sequence: nth number with exactly n divisors
21 Sum data type
21 Window management
20 Color quantization
20 Compiler/code generator
20 EKG sequence convergence
20 Erdős-primes
20 Knuth's power tree
20 Maximum difference between adjacent elements of list
20 Metallic ratios
20 Monads/Writer monad
20 Most frequent k chars distance
20 Names to numbers
20 Next special primes
20 Nonogram solver
20 Odd squarefree semiprimes
20 P-value correction
20 Padovan n-step number sequences
20 Palindromic primes in base 16
20 Primes - allocate descendants to their ancestors
20 Selective file copy
20 Simulate input/Mouse
20 Sleeping Beauty problem
20 Sort the letters of string in alphabetical order
20 Transportation problem
20 Untrusted environment
20 Word search
20 Zeckendorf arithmetic
19 Biorhythms
19 Canonicalize CIDR
19 Code segment unload
19 Compiler/virtual machine interpreter
19 Draw pixel 2
19 Find URI in text
19 Find words which contain the most consonants
19 Just in time processing on a character stream
19 Matrix digital rain
19 Numbers in base-16 representation that cannot be written with decimal digits
19 Peaceful chess queen armies
19 Percolation/Site percolation
19 Prime triplets
19 Prime words
19 SQL-based authentication
19 Special factorials
19 Substring primes
18 Banker's algorithm
18 Concatenate two primes is also prime
18 Cubic Special Primes
18 Find first missing positive
18 Free polyominoes enumeration
18 Imaginary base numbers
18 Minimum number of cells after, before, above and below NxN squares
18 NYSIIS
18 Nimber arithmetic
18 Particle swarm optimization
18 Percolation/Mean cluster density
18 Positive decimal integers with the digit 1 occurring exactly twice
18 Practical numbers
18 Prime numbers which contain 123
18 Primes which contain only one odd digit
18 Proof O O
18 Pseudo-random numbers/Splitmix64
18 Self-hosting compiler O
18 Separate the house number from the street name
18 Snake
18 Suffix tree
18 Tarjan
18 The sieve of Sundaram
18 Two bullet roulette
18 Vibrating rectangles
17 Aspect oriented programming
17 Bitmap/Read an image through a pipe
17 Chernick's Carmichael numbers
17 Compare sorting algorithms' performance
17 Compiler/syntax analyzer
17 Cyclops numbers
17 Cyclotomic polynomial
17 Geometric algebra
17 Getting the number of decimals
17 HTTPS/Client-authenticated O
17 Jaro-Winkler distance
17 Logistic curve fitting in epidemiology
17 Motzkin numbers
17 Numbers whose count of divisors is prime
17 Percolation/Bond percolation
17 Permutations with some identical elements
17 Permuted multiples
17 Primes whose first and last number is 3
17 Quadrat Special Primes
17 Ramanujan's constant
17 Rendezvous
17 Retrieve and search chat history
17 Sierpinski curve
17 Singly-linked list/Element removal
17 Special neighbor primes
17 Square root by hand
17 Terminal control/Positional read
17 Unique characters in each string
17 Wilson primes of order n
16 Bioinformatics/Subsequence
16 Bitmap/PPM conversion through a pipe
16 Compiler/AST interpreter
16 Four is the number of letters in the ...
16 Generate random numbers without repeating a value
16 Numerical integration/Adaptive Simpson's method
16 Print itself
16 Reverse the order of lines in a text file while preserving the contents of each line
16 Sine wave
16 Smallest numbers
16 Special pythagorean triplet
16 Topological sort/Extracted top item
16 XML validation
15 Functional coverage tree
15 Gradient descent
15 Harmonic series
15 Interactive help
15 Modified random distribution
15 OpenWebNet password
15 Prime numbers p which sum of prime numbers less or equal to p is prime
15 SHA-256 Merkle tree
15 Sierpinski square curve
15 Untouchable numbers
15 Word ladder
14 Continued fraction/Arithmetic/G(matrix ng, continued fraction n)
14 Deconvolution/2D+
14 Factorial base numbers indexing permutations of a collection
14 Generalised floating point addition
14 Legendre prime counting function
14 Longest palindromic substrings
14 Multi-base primes
14 Pisano period
14 Run as a daemon or service
14 Sum of primes in odd positions is prime
14 Tree from nesting levels
14 XXXX redacted
13 Air mass
13 Canny edge detector
13 Checksumcolor
13 Display an outline as a nested table
13 Greed
13 Juggler sequence
13 Launch rocket with countdown and acceleration in stdout
13 Longest substrings without repeating characters
13 Minimal steps down to 1
13 Non-transitive dice
13 One-time pad
13 Penrose tiling
13 Pentomino tiling
13 Railway circuit
13 Simulated annealing
13 Sorting algorithms/Tree sort on a linked list
13 Text completion
13 Three word location
13 Unit testing
13 VList
12 Audio frequency generator
12 Catmull–Clark subdivision surface
12 Combinations with repetitions/Square digit chain
12 Distinct Palindromes within decimal numbers
12 Distribution of 0 Digits in factorial series
12 Execute CopyPasta Language
12 External sort
12 Fortunate numbers
12 French Republican calendar
12 Geohash
12 Minkowski question-mark function
12 Pandigital prime
12 Pseudorandom number generator image
12 Safe mode
12 Spoof game
12 Suffixation of decimal numbers
12 Tetris
12 Time-based one-time password algorithm
12 Using a speech engine to highlight words
11 Bioinformatics/Global alignment
11 Count the coins/0-1
11 Curve that touches three points
11 Fibonacci matrix-exponentiation
11 Graph colouring
11 Home primes
11 Hourglass puzzle
11 Powerful numbers
11 Quoting constructs
11 Range modifications
11 Resistance calculator
11 Square form factorization
11 Tree datastructures
11 Tropical algebra overloading
11 War card game
10 16 puzzle game
10 Colour pinstripe/Printer
10 Conjugate a Latin Verb
10 Elliptic Curve Digital Signature Algorithm
10 Faces from a mesh
10 Morpion solitaire
10 Numerical and alphabetical suffixes
10 OpenGL/Utah Teapot
10 Parse EBNF
10 Pinstripe/Printer
10 Ramanujan primes
10 Resistance network calculator
10 Rosetta Code/Rank languages by number of users
10 Rosetta Code/Tasks without examples
10 Sort an outline at every level
10 Starting a web browser
10 Text to HTML
10 Verhoeff algorithm
9 ADFGVX cipher
9 Continued fraction/Arithmetic/G(matrix ng, continued fraction n1, continued fraction n2)
9 Discrete Fourier transform
9 Fibonacci heap
9 IPC via named pipe
9 Mayan calendar
9 Multidimensional Newton-Raphson method
9 Terminal control/Restricted width positional input/No wrapping
9 Terminal control/Restricted width positional input/With wrapping
9 User defined pipe and redirection operators
8 Brace expansion using ranges
8 Compiler/Verifying syntax
8 Doubly-linked list/Element removal
8 Find Chess960 starting position identifier
8 OpenGL pixel shader
8 Overloaded operators
8 Price list behind API
8 Ramanujan primes/twins
8 Random sentence from book
8 Robots
8 Smallest enclosing circle problem
8 Tamagotchi emulator
7 Addition-chain exponentiation
7 Black Box
7 Boids
7 Hexapawn
7 I'm a software engineer, get me out of here
7 Latin Squares in reduced form/Randomizing using Jacobson and Matthews’ Technique
7 P-Adic numbers, basic
7 Process SMIL directives in XML data
7 Raster bars
7 Recursive descent parser generator
7 Remote agent/Agent logic
7 Remote agent/Simulation
7 Rosetta Code/Run examples
7 Simple turtle graphics
7 URL shortener
7 Waveform analysis/Doh ray me
7 Wordiff
6 Audio overlap loop
6 Chess player
6 Compiler/Simple file inclusion pre processor
6 Horse racing
6 Integer long division
6 Remote agent/Agent interface
6 Solve a Rubik's Cube
6 Strassen's algorithm
5 Generalised floating point multiplication
5 Number triplets game
5 OLE automation
5 P-Adic square roots
5 Particle fountain
5 Peripheral drift illusion
5 Solving coin problems
5 Unicode polynomial equation
5 Weather routing
5 WiktionaryDumps to words
4 Rosetta Code/List authors of task descriptions
4 Ukkonen’s suffix tree construction
4 Using the Meetup.com API
4 Waveform analysis/Top and tail
3 15 puzzle game in 3D
3 B-spline
3 Blackjack strategy
3 CLI-based maze-game
3 Elevator simulation
3 Multiton
3 Vidir
2 IRC gateway
1 Mine a bitcoin
0 Uno (Card Game)