Rosetta Code/Count examples/Full list/Tier 3

From Rosetta Code

Third tier of languages sorted by number of examples completed.

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

Top tier Second tier Third tier Fourth tier
Third ten programming languages by number of task examples completed:
    ㉑ Sidef         ㉒ ALGOL_68      ㉓ 11l           ㉔ Zkl           ㉕ Factor       
    ㉖ Rust          ㉗ C_sharp       ㉘ Ada           ㉙ D             ㉚ Tcl          
As of 2024-09-05T21:12:47Z :: Tasks: 1298 :: Draft Tasks:383 :: Total Tasks: 1681 :: Total Examples: 97840
Count Task
599 Hello world/Text
389 FizzBuzz
382 99 bottles of beer
359 100 doors
313 Comments
311 Factorial
310 Fibonacci sequence
303 A+B
295 Empty program
264 Loops/Infinite
255 Reverse a string
249 Ackermann function
247 Arrays
247 Function definition
242 Loops/For
234 Conditional structures
234 Loops/While
226 Array concatenation
220 Arithmetic/Integer
216 Greatest element of a list
210 Greatest common divisor
210 Repeat a string
208 Even or odd
207 Increment a numerical string
206 Sieve of Eratosthenes
204 Array length
201 Binary digits
199 Averages/Arithmetic mean
199 Hello world/Graphical
198 Towers of Hanoi
197 String concatenation
196 Copy a string
195 Rot-13
192 Sum and product of an array
191 Loops/Downward for
190 Boolean values
190 Hello world/Newline omission
190 Palindrome detection
189 Character codes
189 Integer comparison
188 Integer sequence
187 Apply a callback to an array
185 Loops/For with a specified step
185 String length
184 String case
183 Tokenize a string
182 Sum of a series
181 Loops/Break
181 Loops/Foreach
180 Empty string
180 Quine
177 Sum of squares
175 Logical operations
174 Dot product
174 Filter
174 Hailstone sequence
172 Loops/Do-while
166 Loops/N plus one half
164 Caesar cipher
164 Generic swap
163 Associative array/Creation
163 Leap year
163 Sort an integer array
160 Determine if a string is numeric
160 Luhn test of credit card numbers
158 Generate lower case ASCII alphabet
158 User input/Text
157 System time
156 Command-line arguments
156 Factors of an integer
156 Stack
155 Execute a system command
155 Higher-order functions
155 Loops/Continue
155 Zero to the zero power
154 ABC problem
154 Hello world/Standard error
153 Loop over multiple arrays simultaneously
153 Sorting algorithms/Quicksort
152 Bitwise operations
152 Mutual recursion
151 Primality by trial division
151 Sorting algorithms/Bubble sort
150 Guess the number
149 Read entire file
149 Remove duplicate elements
148 Check that file exists
148 Least common multiple
147 Balanced brackets
147 Count in octal
147 Create a file
146 Ethiopian multiplication
146 Roman numerals/Encode
145 Happy numbers
145 Sleep
144 Day of the week
144 File input/output
144 Mandelbrot set
143 Count occurrences of a substring
143 Date format
142 Program termination
142 Substring
141 Literals/Integer
141 Literals/String
141 Pascal's triangle
140 Variables
139 Strip a set of characters from a string
137 Function composition
137 Knuth shuffle
136 Compound data type
136 N-queens problem
136 Pick random element
135 Babbage problem
135 Loops/Nested
134 Include a file
134 Letter frequency
134 Matrix transposition
134 Null object
134 Sorting algorithms/Insertion sort
134 String matching
133 Averages/Median
132 Align columns
131 Averages/Root mean square
131 Detect division by zero
131 File size
131 Look-and-say sequence
131 Read a file line by line
130 Anagrams
130 Binary search
130 Matrix multiplication
130 Return multiple values
130 String append
129 Flatten a list
128 Associative array/Iteration
128 Delete a file
128 Hash from two arrays
128 Identity matrix
127 Conway's Game of Life
127 Find limit of recursion
127 Guess the number/With feedback
127 Perfect numbers
126 Harshad or Niven series
126 Input loop
126 Sierpinski triangle
125 Levenshtein distance
125 Roman numerals/Decode
124 Comma quibbling
124 Haversine formula
124 Substring/Top and tail
123 Call a function
123 Case-sensitivity of identifiers
123 Environment variables
123 Reverse words in a string
123 Run-length encoding
123 String interpolation (included)
122 Assertions
122 Bulls and cows
122 Classes
122 Real constants and functions
121 Ordered words
121 Search a list
121 Variadic function
120 Arithmetic/Complex
120 Multiplication tables
120 Pangram checker
120 Rename a file
120 Sum multiples of 3 and 5
119 Combinations
119 Formatted numeric output
119 HTTP
119 Strip whitespace from a string/Top and tail
118 Averages/Pythagorean means
118 Horner's rule for polynomial evaluation
117 Create a two-dimensional array at runtime
117 Infinity
117 Sum digits of an integer
117 The Twelve Days of Christmas
116 Accumulator factory
116 Evaluate binomial coefficients
116 Hostname
116 Permutations
116 Program name
115 Anonymous recursion
115 Random numbers
115 String prepend
115 Temperature conversion
114 Calculating the value of e
114 Digital root
114 Sequence of non-squares
114 Zig-zag matrix
113 Sorting algorithms/Merge sort
112 24 game
112 Middle three digits
112 Queue/Definition
112 Trigonometric functions
111 Amicable pairs
111 Catalan numbers
111 Exceptions
111 Time a function
110 Evolutionary algorithm
110 Shell one-liner
110 Vector products
109 Abundant, deficient and perfect number classifications
109 Arbitrary-precision integers (included)
109 Arithmetic-geometric mean
109 Prime decomposition
109 Short-circuit evaluation
107 Enumerations
107 Hello world/Newbie
107 N'th
107 Regular expressions
107 Symmetric difference
106 Show ASCII table
106 Split a character string based on change of character
106 Tree traversal
105 Floyd's triangle
105 Power set
104 Averages/Mode
104 Create an HTML table
104 Sorting algorithms/Selection sort
104 Walk a directory/Non-recursively
103 Collections
103 Hamming numbers
103 Hofstadter Q sequence
103 Y combinator O
102 Entropy
102 Execute Brain****
102 Exponentiation operator
102 Map range
102 Range expansion
101 Interactive programming (repl) O O O
101 Nth root
101 Sort using a custom comparator
101 String comparison
100 Address of a variable O O
100 MD5
99 First-class functions
99 Gray code
99 Modular inverse
99 Number reversal game
99 Random number generator (included)
99 Sorting algorithms/Cocktail sort
98 Catamorphism
98 Compare a list of strings
98 Forward difference
98 Langton's ant
98 Last Friday of each month
98 Sorting algorithms/Bogosort
98 Sorting algorithms/Heapsort
97 CSV data manipulation
97 Monty Hall problem
97 Range extraction
97 Repeat
97 Sierpinski carpet
97 Terminal control/Clear the screen
96 Greatest subsequential sum
96 Inheritance/Single O
96 JSON
96 Menu
96 One-dimensional cellular automata
96 Sorting algorithms/Gnome sort
95 Abstract type O O
95 Anti-primes
95 Averages/Simple moving average
95 Cumulative standard deviation
95 Number names
94 Almost prime
94 Department numbers
94 Munchausen numbers
94 Population count
94 Simple windowed application
93 Additive primes
93 Box the compass
93 Count in factors
93 Find the last Sunday of each month
93 Five weekends
93 Literals/Floating point
93 Non-decimal radices/Convert
92 CRC-32
92 CSV to HTML translation
92 Find common directory path
92 Here document
92 Multifactorial
92 Operator precedence
92 Set
92 URL decoding
91 Count the coins
91 Hello world/Line printer
91 Order two numerical lists
91 Playing cards
91 Queue/Usage
91 Window creation
91 Word wrap
90 100 prisoners
90 Bitmap
90 Long multiplication
90 SEDOLs
90 Sort an array of composite structures
90 Strip comments from a string
90 Terminal control/Ringing the terminal bell
90 Thue-Morse
90 Top rank per group
89 15 puzzle game
89 Benford's law
89 Price fraction
89 Proper divisors
89 Read a specific line from a file
89 Walk a directory/Recursively
88 Closures/Value capture
88 Find the missing permutation
88 Josephus problem
88 Take notes on the command line
88 URL encoding
87 Angle difference between two bearings
87 File modification time
87 Introspection
87 Jump anywhere
87 Pi
87 Spiral matrix
86 Attractive numbers
86 Call an object method
86 Convert seconds to compound duration
86 Dynamic variable names O O O
86 Extend your language O
86 Knapsack problem/0-1
86 Lucas-Lehmer test
86 Pythagorean triples
86 Show the epoch
86 Singly-linked list/Traversal
86 Sorting algorithms/Shell sort
86 XML/Input
85 Man or boy test
85 Monte Carlo methods
85 Priority queue
85 Rep-string
85 Sorting algorithms/Counting sort
84 Dragon curve
84 Fibonacci n-step number sequences
84 Kaprekar numbers
84 Keyboard input/Obtain a Y or N response
84 Linear congruential generator
84 Sequence of primes by trial division
84 Sockets
84 Sort disjoint sublist
84 Special characters
83 Concurrent computing
83 Date manipulation
83 Gamma function
83 Jewels and stones
83 Old lady swallowed a fly
83 Pernicious numbers
83 Semordnilap
83 Soundex
83 Unicode variable names
83 Vigenère cipher
83 Write entire file
82 Animation
82 Calendar
82 Call a foreign-language function
82 Currying
82 Equilibrium index
82 Phrase reversals
82 Quaternion type
82 Singly-linked list/Element definition
82 Sorting algorithms/Comb sort
82 Web scraping
81 Anagrams/Deranged anagrams
81 Averages/Mean angle
81 Empty directory
81 Flow-control structures
81 Fractal tree
81 Jensen's Device
81 List comprehensions
81 Narcissistic decimal number
81 Rock-paper-scissors
81 Sort three variables
81 Zeckendorf number representation
80 AKS test for primes
80 Euler method
80 Exponentiation order
80 General FizzBuzz
80 Guess the number/With feedback (player)
80 ISBN13 check digit
80 Sudoku
79 Chinese remainder theorem
79 Damm algorithm
79 Draw a sphere
79 Four bit adder
79 Hello world/Web server
79 I before E except after C
79 Maze generation
79 McNuggets problem
79 Non-decimal radices/Output
79 SHA-1
79 Square but not cube
79 Strip control codes and extended characters from a string
79 Trabb Pardo–Knuth algorithm
79 Van Eck sequence
78 Execute HQ9+
78 Largest int from concatenated ints
78 Read a configuration file
78 Self-describing numbers
78 Semiprime
78 Sorting algorithms/Stooge sort
78 Stern-Brocot sequence
78 Write float arrays to a text file
77 Bitmap/Bresenham's line algorithm
77 Catalan numbers/Pascal's triangle
77 Enforced immutability
77 Roots of unity
77 Stair-climbing puzzle
77 Unix/ls
77 Van der Corput sequence
77 Yin and yang
76 Barnsley fern
76 Combinations with repetitions
76 Exceptions/Catch an exception thrown in a nested call
76 Multiple distinct objects
76 Nested function
76 Parsing/RPN calculator algorithm
76 SHA-256
76 Special variables
75 Constrained random points on a circle
75 Continued fraction
75 Determine if a string is collapsible
75 Longest common subsequence
75 Magic 8-ball
75 Polymorphism
75 Remove vowels from a string
75 Tau function
74 4-rings or 4-squares puzzle
74 Amb
74 Arithmetic/Rational
74 Numerical integration
74 Probabilistic choice
74 RPG attributes generator
74 Runtime evaluation O O
74 Word frequency
73 Closest-pair problem
73 Draw a cuboid
73 Dutch national flag problem
73 Fast Fourier transform
73 Get system command output
73 IBAN
73 Isqrt (integer square root) of X
73 Magic squares of odd order
73 Modular exponentiation
73 Morse code
73 Named parameters O O O
73 Smith numbers
73 Sorting algorithms/Pancake sort
73 Text processing/Max licenses in use
73 Two sum
73 Variable size/Get
72 Abundant odd numbers
72 Best shuffle
72 Cartesian product of two or more lists
72 Chinese zodiac
72 Compile-time calculation
72 Extract file extension
72 Leonardo numbers
72 Singly-linked list/Element insertion
72 Subleq
72 Two identical strings
71 Base64 decode data
71 Circles of given radius through two points
71 Determine if a string has all the same characters
71 Disarium numbers
71 Euler's sum of powers conjecture
71 Host introspection
71 Long year
71 Longest common prefix
71 Memory allocation
71 One of n lines in a file
71 Primality by Wilson's theorem
71 Remove lines from a file
71 Roots of a function
70 Binary strings
70 Documentation
70 Emirp primes
70 Factors of a Mersenne number
70 Mouse position
70 Reduced row echelon form
70 Sort stability
70 Write language name in 3D ASCII
69 9 billion names of God the integer
69 Animate a pendulum
69 Arithmetic evaluation
69 Base64 encode data
69 CUSIP
69 Cholesky decomposition
69 Draw a clock
69 Draw a pixel
69 Fork
69 Integer overflow
69 Miller–Rabin primality test
69 Non-decimal radices/Input
69 Plot coordinate pairs
69 Runge-Kutta method
69 Tau number
69 Test a function
69 Tic-tac-toe
69 Undefined values
69 XML/Output
68 Averages/Mean time of day
68 Copy stdin to stdout
68 Globally replace text in several files
68 HTTPS
68 Hofstadter-Conway $10,000 sequence
68 Longest common substring
68 Roots of a quadratic function
68 Sorting algorithms/Sleep sort
68 Terminal control/Display an extended character
67 Cantor set
67 Code Golf: Code Golf
67 FASTA format
67 Gapful numbers
67 Inheritance/Multiple
67 Optional parameters
67 Pascal matrix generation
67 Quickselect algorithm
67 Ternary logic
67 Truncatable primes
67 Vector
66 2048
66 Bitmap/Write a PPM file
66 Farey sequence
66 Generator/Exponential
66 Knapsack problem/Continuous
66 Knapsack problem/Unbounded
66 Knight's tour
66 Loops/Increment loop index within loop body
66 Ludic numbers
66 Maximum triangle path sum
66 Smallest square that begins with n
66 Totient function
66 Unicode strings
66 Words containing "the" substring
65 Archimedean spiral
65 Days between dates
65 Dinesman's multiple-dwelling problem
65 Fusc sequence
65 JortSort
64 24 game/Solve
64 Add a variable to a class instance at runtime O O O
64 Brownian tree
64 DNS query
64 Deal cards for FreeCell
64 Discordian date
64 Fibonacci word
64 Huffman coding
64 Left factorials
64 Matrix-exponentiation operator
64 Multisplit
64 Nim game
64 Sattolo cycle
64 Sorting algorithms/Permutation sort
64 Sum of divisors
64 Sum of first n cubes
64 Truncate a file
63 Convert decimal number to rational
63 Dijkstra's algorithm
63 Find the intersection of two lines
63 Horizontal sundial calculations
63 Iterated digits squaring
63 Loops/With multiple ranges
63 Odd word problem
63 Partial function application
63 Random number generator (device)
63 Scope modifiers
63 Terminal control/Coloured text
63 Validate International Securities Identification Number
62 Define a primitive data type
62 Doubly-linked list/Element definition
62 Extreme floating point values
62 Grayscale image
62 Kernighans large earthquake problem
62 LZW compression
62 Largest proper divisor of n
62 Mad Libs
62 Pointers and references
62 Sort numbers lexicographically
62 Stem-and-leaf plot
61 Abbreviations, automatic
61 Associative array/Merging
61 Compare length of two strings
61 Hash join
61 Pig the dice game
61 Sorting algorithms/Bead sort
61 Topological sort
61 Unbias a random generator
61 User input/Graphical
60 Bell numbers
60 Bernoulli numbers
60 First-class functions/Use numbers analogously
60 Forest fire
60 Inverted syntax O
60 Keyboard input/Keypress check
60 Password generator
60 Perfect shuffle
60 Runtime evaluation/In an environment O O
60 Shoelace formula for polygonal area
60 Sierpinski triangle/Graphical
60 Singleton
60 Tokenize a string with escaping
60 Water collected between towers
59 Call a function in a shared library
59 Chaos game
59 Delegates
59 Halt and catch fire
59 Handle a signal
59 Holidays related to Easter
59 Kronecker product
59 Non-continuous subsequences
59 Perfect totient numbers
59 Rosetta Code/Rank languages by popularity
59 Search a list of records
59 Stack traces
59 Statistics/Basic
59 Universal Turing machine
59 Wireworld
58 ABC words
58 Bioinformatics/base count
58 Determine if a string has all unique characters
58 Egyptian division
58 Heronian triangles
58 Hofstadter Figure-Figure sequences
58 Modulinos O
58 Naming conventions
58 Rate counter
58 Recaman's sequence
58 Set consolidation
58 Seven-sided dice from five-sided dice
58 Strange plus numbers
58 Strip block comments
58 Sum of the digits of n is substring of n
58 XML/XPath
57 Find words which contains more than 3 e vowels
57 Fractran
57 Generate Chess960 starting position
57 Longest string challenge
57 Matrix with two diagonals
57 Odd and square numbers
57 Polynomial regression
57 XML/DOM serialization
56 Average loop length
56 Extensible prime generator
56 Gaussian elimination
56 Jaro similarity
56 Longest increasing subsequence
56 Move-to-front algorithm
56 Send email O
56 Synchronous concurrency
56 Terminal control/Cursor positioning
56 The Name Game
56 Ulam spiral (for primes)
55 Casting out nines
55 Determinant and permanent
55 Determine if a string is squeezable
55 Doubly-linked list/Element insertion
55 Execute a Markov algorithm
55 Hilbert curve
55 Mertens function
55 Munching squares
55 Spinning rod animation/Text
55 Substitution cipher
55 Text between
55 Text processing/2
55 Zebra puzzle
54 21 game
54 Aliquot sequence classifications
54 Append a record to the end of a text file
54 Convex hull
54 Digital root/Multiplicative digital root
54 Doubly-linked list/Traversal
54 Elementary cellular automaton
54 Find words which contains all the vowels
54 Greyscale bars/Display
54 Idiomatically determine all the lowercase and uppercase letters
54 Musical scale
53 Chowla numbers
53 Count how many vowels and consonants occur in a string
53 Currency
53 Dining philosophers
53 Floyd-Warshall algorithm
53 Image noise
53 MAC vendor lookup
53 Make directory path
53 Numbers divisible by their individual digits, but not by the product of their digits.
53 Start from a main routine O O O
53 Text processing/1
52 Approximate equality
52 Colour bars/Display
52 Doubly-linked list/Definition
52 GUI component interaction
52 Last letter-first letter
52 Metaprogramming O
52 Permutations/Derangements
52 Polymorphic copy
52 Polynomial long division
52 Problem of Apollonius
52 Respond to an unknown method call O O
52 Send an unknown method call O O
52 Show the (decimal) value of a number of 1s appended with a 3, then squared
52 Stable marriage problem
52 Strange numbers
52 Taxicab numbers
52 Verify distribution uniformity/Naive
51 10001th prime
51 Abbreviations, easy
51 Ascending primes
51 Base 16 numbers needing a to f
51 Bitmap/Flood fill
51 Colour pinstripe/Display
51 Combinations and permutations
51 Find prime n such that reversed n is also prime
51 History variables
51 Product of divisors
51 UTF-8 encode and decode
51 Unique characters
51 Variable size/Set
50 Bitmap/Midpoint circle algorithm
50 Bitmap/Read a PPM file
50 Brazilian numbers
50 Bulls and cows/Player
50 Coprimes
50 Deepcopy
50 Flipping bits game
50 Golden ratio/Convergence
50 Humble numbers
50 Lah numbers
50 Nice primes
50 Permutations by swapping
50 Sequence: smallest number with exactly n divisors
50 Shift list elements to left by 3
50 Sorting Algorithms/Circle Sort
50 Sorting algorithms/Radix sort
50 Sparkline in unicode
50 Special divisors
50 Sum to 100
50 Twelve statements
50 Visualize a tree
50 Yellowstone sequence
49 Active object
49 Continued fraction/Arithmetic/Construct from rational number
49 Determine if only one instance is running
49 Display a linear combination
49 Element-wise operations
49 File extension is in extensions list
49 Find square difference
49 Loops/Wrong ranges
49 Magnanimous numbers
49 Narcissist
49 OpenGL
49 Parsing/Shunting-yard algorithm
49 Pseudo-random numbers/Middle-square method
49 Steady squares
49 Sudan function
49 Terminal control/Dimensions
48 Abbreviations, simple
48 Balanced ternary
48 Color of a screen pixel
48 Eban numbers
48 Feigenbaum constant calculation
48 Fivenum
48 GUI/Maximum window dimensions
48 Input/Output for pairs of numbers
48 Julia set
48 Keyboard input/Flush the keyboard buffer
48 Knapsack problem/Bounded
48 Long primes
48 Mersenne primes
48 Palindrome dates
48 Safe primes and unsafe primes
48 Secure temporary file
48 Sort a list of object identifiers
48 Speech synthesis O
48 Subtractive generator
48 Truth table
47 Arithmetic numbers
47 Brace expansion
47 Cheryl's birthday
47 Echo server
47 Euler's identity
47 Extra primes
47 Factorions
47 Find the intersection of a line with a plane
47 Find words whose first and last three letters are equal
47 Largest number divisible by its digits
47 Numbers with prime digits whose sum is 13
47 Pythagorean quadruples
47 Read a file character by character/UTF8
47 Rosetta Code/Count examples
47 Sailors, coconuts and a monkey problem
47 Scope/Function names and labels
47 Sorting algorithms/Patience sort
47 Sutherland-Hodgman polygon clipping
47 Table creation/Postal addresses
47 Terminal control/Hiding the cursor
47 Triplet of three numbers
47 Type detection
46 Append numbers at same position in strings
46 Arithmetic-geometric mean/Calculate Pi
46 Atomic updates
46 Carmichael 3 strong pseudoprimes
46 Chaocipher
46 Compiler/lexical analyzer
46 Cycle detection
46 Find prime numbers of the form n*n*n+2
46 Find words with alternating vowels and consonants
46 Hickerson series of almost integers
46 Integer roots
46 Koch curve
46 MD5/Implementation
46 Numerical integration/Adaptive Simpson's method
46 Pascal's triangle/Puzzle
46 Permutations with repetitions
46 Primorial numbers
46 Sequence: smallest number greater than previous term with exactly n divisors
45 Bitwise IO
45 Church numerals
45 Cramer's rule
45 Cuban primes
45 Digit fifth powers
45 Fairshare between two and more
45 Find palindromic numbers in both binary and ternary bases
45 Find squares n where n+1 is prime
45 First 9 prime Fibonacci number
45 Four is magic
45 Frobenius numbers
45 Input/Output for lines of text
45 Kahan summation
45 Magic squares of doubly even order
45 Parametric polymorphism O O O
45 Partition an integer x into n primes
45 Percentage difference between images
45 Primes whose sum of digits is 25
45 Ranking methods
45 S-expressions
45 Solve the no connection puzzle
45 Sorting algorithms/Strand sort
45 Sum of elements below main diagonal of matrix
45 Summarize and say sequence
45 Terminal control/Inverse video
45 Variable-length quantity
45 Voronoi diagram
44 Abelian sandpile model
44 Alternade words
44 Calendar - for "REAL" programmers O O
44 Cousin primes
44 Function prototype O
44 Implicit type conversion
44 Longest common suffix
44 Maze solving
44 Modular arithmetic
44 Numbers in base-16 representation that cannot be written with decimal digits
44 Palindromic primes
44 Parallel calculations
44 Penney's game
44 Prime conspiracy
44 Sort the letters of string in alphabetical order
44 Test integerness
44 Topswops
44 Vampire number
43 Check output device is a terminal
43 Circular primes
43 GUI enabling/disabling of controls
43 Inverted index
43 Knuth's algorithm S
43 Metronome
43 Mosaic matrix
43 Multiple regression
43 Numbers whose binary and ternary digit sums are prime
43 Pathological floating point problems
43 Pythagoras tree
43 Ray-casting algorithm
43 Statistics/Normal distribution
43 Xiaolin Wu's line algorithm
42 Bitmap/Bézier curves/Cubic
42 Change e letters to i in words
42 Common list elements
42 Determine if two triangles overlap
42 Dice game probabilities
42 Draw a rotating cube
42 Fibonacci word/fractal
42 Find if a point is within a triangle
42 Harmonic series
42 Length of an arc between two angles
42 Maximum difference between adjacent elements of list
42 Minimum multiple of m where digital sum equals m
42 Multi-dimensional array
42 Numbers with same digit set in base 10 and base 16
42 Numerical integration/Gauss-Legendre Quadrature
42 Old Russian measure of length
42 Order disjoint list items
42 Permutation test
42 Pinstripe/Display
42 Poker hand analyser
42 QR decomposition
42 Rosetta Code/Find bare lang tags
42 Safe and Sophie Germain primes
42 Strange unique prime triplets
42 Unique characters in each string
42 Word wheel
41 Angles (geometric), normalization and conversion
41 Apply a digital filter (direct form II transposed)
41 Break OO privacy O
41 Calkin-Wilf sequence
41 Canonicalize CIDR
41 Constrained genericity O O O
41 Create a file on magnetic tape O O
41 Deceptive numbers
41 Diversity prediction theorem
41 Doomsday rule
41 Entropy/Narcissist
41 Events
41 First power of 2 that has leading decimal digits of 12
41 LU decomposition
41 Lychrel numbers
41 Machine code
41 Metered concurrency
41 Minimum number of cells after, before, above and below NxN squares
41 Minimum numbers of three lists
41 Möbius function
41 O'Halloran numbers
41 Object serialization
41 Parsing/RPN to infix conversion
41 Perlin noise
41 Positive decimal integers with the digit 1 occurring exactly twice
41 Set puzzle
41 Smarandache prime-digital sequence
41 Square-free integers
41 Successive prime differences
40 AVL tree
40 Conjugate transpose
40 Create an object at a given address O
40 Find first missing positive
40 Four sides of square
40 Gauss-Jordan matrix inversion
40 Jacobi symbol
40 Motzkin numbers
40 Negative base numbers
40 Neighbour primes
40 Numbers in base 10 that are palindromic in bases 2, 4, and 16
40 Numbers with equal rises and falls
40 Polyspiral
40 Strong and weak primes
40 Subset sum problem
40 Summarize primes
40 Weird numbers
40 Zumkeller numbers
39 Algebraic data types O
39 Bin given limits
39 Bitmap/Bézier curves/Quadratic
39 Burrows–Wheeler transform
39 Common sorted list
39 Erdős-primes
39 Esthetic numbers
39 Find first and last set bit of a long integer
39 Find minimum number of coins that make a given value
39 First perfect square in base n with n unique digits
39 Giuga numbers
39 Jacobsthal numbers
39 Minesweeper game
39 Multiline shebang
39 Mutex O
39 Parse command-line arguments
39 Peano curve
39 Pragmatic directives
39 RIPEMD-160
39 RSA code
39 Sorting algorithms/Cycle sort
39 Superellipse
39 Terminal control/Unicode output
39 Textonyms
39 Twin primes
39 Words from neighbour ones
38 Changeable words
38 Color wheel
38 Day of the week of Christmas and New Year
38 Euler's constant 0.5772...
38 Faulhaber's triangle
38 Find words which contain the most consonants
38 Greedy algorithm for Egyptian fractions
38 Largest prime factor
38 MD4
38 Ordered partitions
38 Padovan sequence
38 Partition function P
38 Pentagram
38 Primes with digits in nondecreasing order
38 Product of min and max prime factors
38 Ramer-Douglas-Peucker line simplification
38 Reflection/List properties O
38 Rosetta Code/Find unimplemented tasks
38 Solve a Hidato puzzle
38 Sum and product puzzle
38 Terminal control/Cursor movement
37 Bacon cipher
37 Biorhythms
37 Check input device is a terminal
37 Chemical calculator
37 Death Star
37 Decimal floating point number to binary
37 Deconvolution/1D
37 Descending primes
37 Determine sentence type
37 Exactly three adjacent 3 in lists
37 Galton box animation
37 Generate random numbers without repeating a value
37 Law of cosines - triples
37 Long literals, with continuations
37 Mayan numerals
37 Mian-Chowla sequence
37 Next highest int from digits
37 Numbers which are the cube roots of the product of their proper divisors
37 Pell's equation
37 Pseudo-random numbers/PCG32
37 Range consolidation
37 Sexy primes
37 Simple database
37 Sylvester's sequence
37 Terminal control/Preserve screen
37 URL parser
37 Wieferich primes
36 Chebyshev coefficients
36 Cullen and Woodall numbers
36 Decision tables
36 Factorial primes
36 Faulhaber's formula
36 Increasing gaps between consecutive Niven numbers
36 Monads/Maybe monad
36 Odd squarefree semiprimes
36 Odd words
36 Random Latin squares
36 Sleeping Beauty problem
36 Smallest multiple
36 Super-d numbers
36 Topic variable O O O
36 Two's complement
36 Write to Windows event log
35 Bioinformatics/Sequence mutation
35 Bitmap/Histogram
35 Cistercian numerals
35 Concatenate two primes is also prime
35 De Bruijn sequences
35 Distinct power numbers
35 Executable library
35 FTP
35 Klarner-Rado sequence
35 Last list item
35 Memory layout of a data structure
35 Mind boggling card trick
35 Minimum positive multiple in base 10 using only 0 and 1
35 Multiplicative order
35 Parallel brute force
35 Parameterized SQL statement O
35 Pierpont primes
35 Piprimes
35 Prime numbers which contain 123
35 Prime triplets
35 Resistor mesh
35 Selectively replace multiple instances of a character within a string
35 Set of real numbers
35 Sierpinski arrowhead curve
35 Stirling numbers of the first kind
35 Stirling numbers of the second kind
35 Straddling checkerboard
35 Summation of primes
35 Unprimeable numbers
35 Use another language to call a function
35 Verify distribution uniformity/Chi-squared test
35 Window creation/X11
35 Word break problem
34 Bitcoin/address validation
34 Cut a rectangle
34 Deming's funnel
34 Duffinian numbers
34 Execute SNUSP
34 Finite state machine
34 First class environments O
34 Generate random chess position
34 HTTPS/Authenticated
34 Honaker primes
34 Hunt the Wumpus
34 Idiomatically determine all the characters that can be used for symbols
34 Kronecker product based fractals
34 Largest five adjacent number
34 N-smooth numbers
34 Nonoblock
34 Prime words
34 Reflection/List methods O
34 Riordan numbers
34 Sierpinski pentagon
34 Special neighbor primes
34 Sum of primes in odd positions is prime
34 Sum of square and cube digits of an integer are primes
34 Total circles area
34 Video display modes O O
34 Zhang-Suen thinning algorithm
33 Almkvist-Giullera formula for pi
33 Checkpoint synchronization
33 Compiler/virtual machine interpreter
33 Curzon numbers
33 Fermat numbers
33 Go Fish
33 Idoneal numbers
33 Legendre prime counting function
33 Plasma effect
33 Sorting algorithms/Cocktail sort with shifting bounds
33 State name puzzle
32 Anadromes
32 Arena storage pool
32 Chat server
32 Collect and sort square numbers in ascending order from three lists
32 Cyclops numbers
32 Decorate-sort-undecorate idiom
32 Hex words
32 Honeycombs
32 Keyboard macros
32 Merge and aggregate datasets
32 Natural sorting
32 Numbers whose count of divisors is prime
32 Numeric error propagation
32 Own digits power sum
32 Play recorded sounds
32 Primes which contain only one odd digit
32 Ramsey's theorem
32 Reverse the order of lines in a text file while preserving the contents of each line
32 Rosetta Code/Fix code tags
32 Stream merge
32 Sunflower fractal
32 Table creation
32 Teacup rim text
32 UPC
31 A* search algorithm
31 Birthday problem
31 Brilliant numbers
31 Check Machin-like formulas
31 Coprime triplets
31 De Polignac numbers
31 Euclidean rhythm
31 Find adjacent primes which differ by a square integer
31 Formal power series
31 Inventory sequence
31 Longest substrings without repeating characters
31 Magic squares of singly even order
31 Monads/List monad
31 Next special primes
31 Numeric separator syntax
31 Orbital elements
31 Order by pair comparisons
31 Palindromic gapful numbers
31 Palindromic primes in base 16
31 Pseudo-random numbers/Splitmix64
31 Quadrat special primes
31 Safe addition
31 Shortest common supersequence
31 Snake and ladder
31 Spelling of ordinal numbers
31 Superpermutation minimisation
31 The ISAAC cipher
31 Thiele's interpolation formula
31 Tonelli-Shanks algorithm
31 Ulam numbers
31 Update a configuration file
31 Wordle comparison
30 15 puzzle solver
30 Active Directory/Connect
30 Audio alarm
30 Card shuffles
30 Colorful numbers
30 Consecutive primes with ascending or descending differences
30 Cubic special primes
30 EKG sequence convergence
30 Find largest left truncatable prime in a given base
30 Fixed length records
30 Function frequency
30 Magic constant
30 Matrix chain multiplication
30 N-grams
30 Percolation/Mean run density
30 Primes whose first and last number is 3
30 Same fringe
30 Smallest power of 6 whose decimal expansion contains n
30 Solve a Holy Knight's tour
30 Sum of two adjacent numbers are primes
29 Abelian sandpile model/Identity
29 Base58Check encoding
29 Calmo numbers
29 Camel case and snake case
29 Commatizing numbers
29 Continued fraction/Arithmetic/G(matrix ng, continued fraction n)
29 Elementary cellular automaton/Random number generator
29 Euclid-Mullin sequence
29 Exponentiation with infix operators in (or operating on) the base
29 Fraction reduction
29 Getting the number of decimal places
29 Image convolution
29 Intersecting number wheels
29 Largest difference between adjacent primes
29 Levenshtein distance/Alignment
29 Make a backup file
29 Nautical bell
29 Padovan n-step number sequences
29 Paraffins
29 Parse an IP Address
29 Permutations/Rank of a permutation
29 Permuted multiples
29 Rare numbers
29 Record sound O
29 Self numbers
29 Sequence of primorial primes
29 Snake
29 Soloway's recurring rainfall
29 Solve a Numbrix puzzle
29 Sort primes from list to a list
29 Wagstaff primes
29 Welch's t-test
29 Wilson primes of order n
29 World Cup group stage
28 ASCII art diagram converter
28 Achilles numbers
28 Blum integer
28 Cipolla's algorithm
28 Distributed programming
28 Elliptic curve arithmetic
28 File size distribution
28 K-means++ clustering
28 Kolakoski sequence
28 Kosaraju
28 Linux CPU utilization
28 Lucky and even lucky numbers
28 Playfair cipher
28 Print itself O
28 Pseudo-random numbers/Xorshift star
28 Reverse the gender of a string
28 Round-robin tournament schedule
28 The sieve of Sundaram
28 Yahoo! search interface
27 Composite numbers k with no single digit factors whose factors are all substrings of k
27 Conjugate a Latin verb
27 Largest product in a grid
27 List rooted trees
27 Main step of GOST 28147-89
27 Markov chain text generator
27 Monads/Writer monad
27 Permutations with some identical elements
27 Pisano period
27 Prime numbers p for which the sum of primes less than or equal to p is prime
27 RCRPG
27 Sierpinski curve
27 Simulate input/Keyboard O
27 Solve triangle solitaire puzzle
27 Special factorials
27 Sum data type
27 Word ladder
27 Zeckendorf arithmetic
26 Arithmetic derivative
26 Assertions in design by contract
26 Goldbach's comet
26 Hough transform
26 Inconsummate numbers in base 10
26 Index finite lists of positive integers
26 Mastermind
26 Meissel–Mertens constant
26 Modified random distribution
26 N-body problem
26 Nested templated data
26 Ormiston pairs
26 Pancake numbers
26 Periodic table
26 Print debugging statement
26 Radical of an integer
26 Sierpinski square curve
26 Sine wave
26 Sphenic numbers
26 Substring primes
26 Variable declaration reset
26 Vibrating rectangles
26 Vigenère cipher/Cryptanalysis
25 Active Directory/Search for a user
25 Addition chains
25 Bifid cipher
25 Bilinear interpolation
25 Continued fraction/Arithmetic/G(matrix ng, continued fraction n1, continued fraction n2)
25 Double Twin Primes
25 Eertree
25 Find duplicate files
25 Joystick position O O
25 Largest palindrome product
25 Line circle intersection
25 Matrix digital rain
25 Median filter
25 Metallic ratios
25 Minimum primes
25 Native shebang
25 Pandigital prime
25 Perceptron
25 Practical numbers
25 Quoting constructs
25 Reflection/Get source O
25 SOAP
25 Sequence: nth number with exactly n divisors
25 Set right-adjacent bits
25 Solve a Hopido puzzle
25 Untrusted environment
24 Air mass
24 Bitcoin/public point to address
24 Compare sorting algorithms' performance
24 Compiler/code generator
24 Compiler/syntax analyzer
24 Create an object/Native demonstration
24 Elementary cellular automaton/Infinite length
24 Erdős-Nicolas numbers
24 Iccanobif primes
24 Juggler sequence
24 K-d tree
24 Nonogram solver
24 Numbers which are not the sum of distinct squares
24 Peaceful chess queen armies
24 Pig the dice game/Player
24 Polynomial synthetic division
24 Separate the house number from the street name
24 Singly-linked list/Element removal
24 Smallest numbers
24 Sokoban
24 Special pythagorean triplet
24 Upside-down numbers
24 Vogel's approximation method
23 ABC correlation
23 Draw pixel 2
23 Equal prime and composite sums
23 Fortunate numbers
23 Jordan-Pólya numbers
23 Knuth's power tree
23 Latin Squares in reduced form
23 Long stairs
23 Montgomery reduction
23 Names to numbers
23 Pairs with common factors
23 Percolation/Site percolation
23 Pseudo-random numbers/Combined recursive generator MRG32k3a
23 Ruth-Aaron numbers
23 Sub-unit squares
23 Two bullet roulette
23 Useless instructions
22 Cyclotomic polynomial
22 Data Encryption Standard
22 Imaginary base numbers
22 Jaro-Winkler distance
22 Logistic curve fitting in epidemiology
22 Longest palindromic substrings
22 Multiplicatively perfect numbers
22 Nimber arithmetic
22 Percolation/Mean cluster density
22 Primes - allocate descendants to their ancestors
22 Rhonda numbers
22 Safe mode
22 Selective file copy
22 Self-hosting compiler
22 Simulate input/Mouse O
22 Tarjan
22 Window management
22 XXXX redacted
21 Arithmetic coding/As a generalized change of radix
21 Aspect oriented programming
21 Bézier curves/Intersections
21 Color quantization
21 Curve that touches three points
21 Distribution of 0 digits in factorial series
21 Forbidden numbers
21 HTTPS/Client-authenticated
21 Just in time processing on a character stream
21 Minimal steps down to 1
21 P-value correction
21 Pell numbers
21 Penrose tiling
21 Pseudorandom number generator image
21 Readline interface
21 Repunit primes
21 SEND + MORE = MONEY
21 Simulated annealing
21 Solve hanging lantern problem
21 Three word location
21 Transportation problem
21 Tree from nesting levels
21 Ultra useful primes
21 XML validation
20 Bernstein basis polynomials
20 Bitmap/Read an image through a pipe
20 Chernick's Carmichael numbers
20 Code segment unload
20 Compiler/AST interpreter
20 Execute Computer/Zero
20 Find URI in text
20 Jaccard index
20 Most frequent k chars distance
20 NYSIIS
20 OpenWebNet password
20 Ormiston triples
20 Penta-power prime seeds
20 Polynomial derivative
20 Prime triangle
20 Primes: n*2^m+1
20 Proof O O
20 Quad-power prime seeds
20 Rendezvous
20 Retrieve and search chat history
20 SQL-based authentication
20 Square root by hand
20 Steffensen's method
20 Terminal control/Positional read O
20 War card game
20 Wolstenholme numbers
20 Word search
19 ADFGVX cipher
19 Banker's algorithm
19 Binary coded decimal
19 Bitmap/PPM conversion through a pipe
19 CalmoSoft primes
19 Earliest difference between prime gaps
19 Extreme primes
19 Free polyominoes enumeration
19 Gaussian primes
19 Geohash
19 Gradient descent
19 Home primes
19 Minkowski question-mark function
19 Non-transitive dice
19 Percolation/Bond percolation
19 SHA-256 Merkle tree
19 VList O
19 Zsigmondy numbers
18 Audio frequency generator
18 Bioinformatics/Subsequence
18 CORDIC
18 Canny edge detector
18 Centre and radius of a circle passing through 3 points in a plane
18 Count the coins/0-1
18 Even numbers which cannot be expressed as the sum of two twin primes
18 Find Chess960 starting position identifier
18 Geometric algebra
18 Iterators
18 Pan base non-primes
18 Particle swarm optimization
18 Pentomino tiling
18 Ramanujan primes
18 Ramanujan's constant
18 Sorting algorithms/Tree sort on a linked list
18 Square form factorization
18 Suffix tree
18 Topological sort/Extracted top item
18 Triangular numbers
18 Tropical algebra overloading
18 Walsh matrix
18 Wordiff
17 Boustrophedon transform
17 Factorial base numbers indexing permutations of a collection
17 Four is the number of letters in the ...
17 Gotchas
17 Graph colouring
17 Isograms and heterograms
17 Multi-base primes
17 Overloaded operators
17 Penholodigital squares
17 Prime numbers whose neighboring pairs are tetraprimes
17 Rodrigues’ rotation formula
17 Search in paragraph's text
17 Tetris
17 Unit testing
17 Untouchable numbers
17 Verhoeff algorithm
16 16 puzzle game
16 ASCII control characters
16 Anaprimes
16 Binomial transform
16 Boyer-Moore string search
16 Display an outline as a nested table
16 Distance and Bearing
16 Erdös-Selfridge categorization of primes
16 Faces from a mesh
16 Fermat pseudoprimes
16 Functional coverage tree
16 Interactive help
16 Magic numbers
16 Mayan calendar
16 Railway circuit
16 Rainbow
16 Ramanujan primes/twins
16 Run as a daemon or service
16 Set, the card game
16 Shape-Machine
16 Simple turtle graphics
16 Sisyphus sequence
16 Smarandache-Wellin primes
16 Text completion
16 Tree datastructures
16 Undulating numbers
16 Unescape a string
15 Apéry's constant
15 Catmull–Clark subdivision surface
15 Centroid of a set of N-dimensional points
15 Check if two polygons overlap
15 Fibonacci matrix-exponentiation
15 French Republican calendar
15 Greed
15 Hourglass puzzle
15 One-time pad
15 Prime reciprocal sum
15 Sieve of Pritchard
15 Solve equations with substitution method
15 Suffixation of decimal numbers
15 Tupper's self-referential formula
14 Check if a polygon overlaps with a rectangle
14 Checksumcolor
14 Colour pinstripe/Printer O
14 Combinations with repetitions/Square digit chain
14 Countdown
14 Deconvolution/2D+
14 Execute CopyPasta Language
14 Generalised floating point addition
14 Greatest prime dividing the n-th cubefree number
14 Knuth-Morris-Pratt string search
14 L-system
14 Launch rocket with countdown and acceleration in stdout
14 Least m such that n! + m is prime
14 One-two primes
14 Peripheral drift illusion
14 Powerful numbers
14 Singly-linked list/Reversal
14 Smallest number k such that k+2^m is composite for all m less than k
14 Sort an outline at every level
14 Super-Poulet numbers
14 Time-based one-time password algorithm
14 Transliterate English text using the Greek alphabet
14 Using a speech engine to highlight words
14 Worthwhile task shaving
13 Bioinformatics/Global alignment
13 Brace expansion using ranges
13 Factorize string into Lyndon words
13 Hex dump
13 Particle fountain
13 Range modifications
13 Resistance calculator
13 Rice coding
13 Rosetta Code/Rank languages by number of users
13 Singular value decomposition
13 Spoof game
13 Sync subtitles
13 Terminal control/Restricted width positional input/No wrapping
13 Wasteful, equidigital and frugal numbers
12 Babylonian spiral
12 Distinct palindromes within decimal numbers
12 Elliptic Curve Digital Signature Algorithm
12 Engel expansion
12 External sort
12 IPC via named pipe
12 Morpion solitaire
12 Numerical and alphabetical suffixes
12 Parse EBNF
12 Pinstripe/Printer O
12 Rosetta Code/Tasks without examples
12 Starting a web browser
12 Terminal control/Restricted width positional input/With wrapping
11 ABC incremental counts
11 Addition-chain exponentiation
11 Discrete Fourier transform
11 Doubly-linked list/Element removal
11 GSTrans string conversion
11 Hashtron inference
11 I'm a software engineer, get me out of here
11 Inner classes
11 Integer long division
11 N-queens minimum and knights and bishops
11 Numbers k such that the last letter of k is the same as the first letter of k+1
11 OpenGL/Utah teapot
11 Price list behind API
11 Robots
11 Sealed classes and methods
11 Smallest enclosing circle problem
11 Sorensen–Dice coefficient
11 Statistics/Chi-squared distribution
11 Text to HTML
11 URL shortener
10 Anagram generator
10 B-spline
10 Black box
10 Compiler/Verifying syntax
10 Cycles of a permutation
10 Factor-perfect numbers
10 JSON pointer
10 P-Adic numbers, basic
10 Random sentence from book
10 Raster bars
10 Resistance network calculator
10 Strassen's algorithm
10 Syntax highlighting using Mediawiki formatting
10 Tamagotchi emulator
10 Universal Lambda Machine
10 User defined pipe and redirection operators
10 Variadic fixed-point combinator
9 Audio overlap loop
9 Carmichael lambda function
9 Consistent overhead byte stuffing
9 Dating agency
9 Dominoes
9 Eisenstein primes
9 Exponential digital sums
9 Fibonacci heap
9 Horse racing
9 Lyndon word
9 Marching squares
9 Multidimensional Newton-Raphson method
9 OpenGL pixel shader
9 Rosetta Code/Run examples
9 Segmentation fault protection
9 Selection bias in clinical sciences
8 Compiler/Simple file inclusion pre processor
8 Hexapawn
8 Lagrange Interpolation
8 Lucas-Carmichael numbers
8 P-Adic square roots
8 Recursive descent parser generator
8 Remote agent/Agent logic
8 Remote agent/Simulation
8 Simulated optics experiment/Data analysis
8 Simulated optics experiment/Simulator
8 Waveform analysis/Doh ray me
8 WiktionaryDumps to words
7 Autogram checker
7 Boids
7 Chess player
7 Convert CSV records to TSV
7 Create an executable for a program in an interpreted language
7 Create your own text control codes
7 Divide a rectangle into a number of unequal triangles
7 English cardinal anagrams
7 Goodstein Sequence
7 Latin Squares in reduced form/Randomizing using Jacobson and Matthews' technique
7 Posit numbers/decoding
7 Posit numbers/encoding
7 Process SMIL directives in XML data
7 Red black tree sort
7 Remote agent/Agent interface
7 Roots of a cubic polynomial
7 Solve a Rubik's cube
7 Sturmian word
7 Visitor pattern
7 Wave function collapse
6 CLI-based maze-game
6 Erdős–Woods numbers
6 Multiton
6 OLE automation O O
6 Rosetta Code/List authors of task descriptions
6 Sanitize user input
6 Szymański's algorithm
6 Ukkonen’s suffix tree construction
6 Use a REST API
6 Vidir
6 Waveform analysis/Top and tail
5 Continued fraction convergents
5 Diophantine linear system solving
5 Extended Straddling Checkerboard
5 Generalised floating point multiplication
5 Number triplets game
5 Solving coin problems
5 Unicode polynomial equation
5 Uno (card game)
5 Weather routing
4 15 puzzle game in 3D
4 Blackjack strategy
4 Color separation
4 Compiler/Preprocessor
4 Cross compilation
4 Decreasing contiguous subsequences
4 IRC gateway
4 Protecting Memory Secrets
4 WebGL rotating F
3 3d turtle graphics
3 Elevator simulation