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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 Factor        ㉓ D             ㉔ Tcl           ㉕ 11l          
    ㉖ C_sharp       ㉗ Ada           ㉘ Scala         ㉙ Rust          ㉚ Lua          
As of 2022-06-26T19:39:44Z :: Tasks: 1186 :: Draft Tasks:356 :: Total Tasks: 1542 :: Total Examples: 86899
Count Task
531 Hello world/Text
349 99 bottles of beer
336 FizzBuzz
332 100 doors
309 Fibonacci sequence
299 Factorial
290 Comments
279 A+B
276 Empty program
253 Function definition
241 Loops/Infinite
238 Arrays
238 Loops/While
236 Ackermann function
236 Reverse a string
227 Loops/For
217 Conditional structures
214 Greatest common divisor
208 Greatest element of a list
206 Arithmetic/Integer
203 Array concatenation
203 Even or odd
194 Repeat a string
193 Integer comparison
191 Sieve of Eratosthenes
190 Averages/Arithmetic mean
190 Increment a numerical string
186 Copy a string
186 Hello world/Graphical
181 Binary digits
181 Loops/Downward for
180 Array length
179 Boolean values
179 Towers of Hanoi
177 String concatenation
176 Character codes
175 Apply a callback to an array
175 Sum and product of an array
174 Generic swap
174 Hello world/Newline omission
172 Loops/Do-while
172 String length
171 Integer sequence
171 Loops/For with a specified step
171 Palindrome detection
171 Rot-13
170 Loops/N plus one half
170 Tokenize a string
169 Loops/Foreach
168 Empty string
168 String case
168 Sum of a series
166 Dot product
166 Loops/Break
165 Leap year
165 Quine
164 Sum of squares
161 Hailstone sequence
160 Logical operations
159 Filter
157 Associative array/Creation
157 Factors of an integer
155 Roman numerals/Encode
155 Sorting algorithms/Bubble sort
153 Caesar cipher
153 Sort an integer array
152 Execute a system command
152 System time
151 Loop over multiple arrays simultaneously
150 Luhn test of credit card numbers
150 Remove duplicate elements
149 Higher-order functions
149 Sorting algorithms/Quicksort
148 Guess the number
147 Determine if a string is numeric
147 Primality by trial division
147 Stack
146 Generate lower case ASCII alphabet
146 User input/Text
145 Command-line arguments
145 Day of the week
145 Zero to the zero power
144 File input/output
144 Happy numbers
143 Bitwise operations
143 Read entire file
143 Substring
142 Hello world/Standard error
142 Loops/Continue
141 Check that file exists
141 Mutual recursion
138 Create a file
138 Sleep
137 Least common multiple
136 ABC problem
135 Balanced brackets
135 Date format
134 Ethiopian multiplication
134 Literals/String
134 Pascal's triangle
134 Variables
133 Binary search
133 Flatten a list
133 Program termination
132 Include a file
131 Count in octal
131 Roman numerals/Decode
130 Literals/Integer
129 Function composition
129 Knuth shuffle
128 Compound data type
128 N-queens problem
127 Loops/Nested
127 Mandelbrot set
126 Anagrams
126 Count occurrences of a substring
126 Matrix transposition
126 Multiplication tables
125 Align columns
125 Associative array/Iteration
125 Averages/Root mean square
125 Detect division by zero
125 Pick random element
125 Read a file line by line
125 Real constants and functions
125 Sorting algorithms/Insertion sort
124 Formatted numeric output
123 Guess the number/With feedback
123 Letter frequency
123 Matrix multiplication
122 Haversine formula
122 Identity matrix
122 Null object
122 Pangram checker
122 Return multiple values
122 Strip a set of characters from a string
121 Assertions
121 Case-sensitivity of identifiers
121 Search a list
121 String matching
120 Averages/Median
120 Babbage problem
120 Classes
120 Conway's Game of Life
120 File size
120 Hash from two arrays
120 Look-and-say sequence
120 Perfect numbers
120 Permutations
118 Delete a file
118 Environment variables
118 Find limit of recursion
117 Input loop
117 Sierpinski triangle
116 Catalan numbers
115 Arithmetic/Complex
115 Call a function
115 HTTP
115 String append
114 Infinity
114 String interpolation (included)
113 Anonymous recursion
113 Random numbers
113 Rename a file
113 Reverse words in a string
113 Temperature conversion
112 Evaluate binomial coefficients
112 Horner's rule for polynomial evaluation
112 Levenshtein distance
112 Run-length encoding
112 Variadic function
111 Accumulator factory
111 Harshad or Niven series
111 Hostname
111 Substring/Top and tail
110 Arithmetic-geometric mean
110 The Twelve Days of Christmas
109 Averages/Pythagorean means
109 Bulls and cows
109 Strip whitespace from a string/Top and tail
109 Sum multiples of 3 and 5
108 Comma quibbling
108 N'th
108 Nth root
108 Program name
108 Sorting algorithms/Merge sort
108 Zig-zag matrix
107 Create a two-dimensional array at runtime
107 Prime decomposition
107 Queue/Definition
107 Vector products
106 Exceptions
106 Ordered words
106 Sierpinski carpet
105 Combinations
105 Regular expressions
105 Sequence of non-squares
105 Sorting algorithms/Selection sort
105 Sum digits of an integer
105 Trigonometric functions
104 24 game
104 Digital root
104 Middle three digits
103 Enumerations
103 Shell one-liner
103 String prepend
102 Abundant, deficient and perfect number classifications
102 Amicable pairs
102 Power set
101 Arbitrary-precision integers (included)
101 Evolutionary algorithm
101 Execute Brain****
101 Short-circuit evaluation
100 Sorting algorithms/Gnome sort
100 Walk a directory/Non-recursively
100 Y combinator O
99 Almost prime
99 Interactive programming (repl) O O
99 Range extraction
98 Calculating the value of e
98 Collections
98 Range expansion
98 Time a function
97 MD5
97 One-dimensional cellular automata
97 Symmetric difference
96 Averages/Mode
96 Create an HTML table
96 Exponentiation operator
96 Hello world/Newbie
96 Hofstadter Q sequence
96 Sort using a custom comparator
96 Sorting algorithms/Cocktail sort
95 Dragon curve
95 First-class functions
95 Hamming numbers
95 Map range
95 Random number generator (included)
95 String comparison
94 Entropy
94 Monty Hall problem
94 Number reversal game
93 Averages/Simple moving average
93 Catamorphism
93 Forward difference
93 Gray code
93 Inheritance/Single
93 Price fraction
93 Sorting algorithms/Heapsort
93 Tree traversal
92 CSV data manipulation
92 Cumulative standard deviation
92 Last Friday of each month
92 Number names
92 Sorting algorithms/Bogosort
91 JSON
91 Langton's ant
91 Menu
91 Terminal control/Clear the screen
90 Abstract type O
90 Compare a list of strings
90 Greatest subsequential sum
90 Josephus problem
90 Simple windowed application
89 Address of a variable O
89 Five weekends
89 Floyd's triangle
88 Repeat
88 Split a character string based on change of character
88 URL decoding
88 Window creation
87 Anti-primes
87 Count in factors
87 Find the last Sunday of each month
87 Non-decimal radices/Convert
87 Set
87 Show ASCII table
87 Sort an array of composite structures
86 Box the compass
86 Modular inverse
86 Monte Carlo methods
86 Order two numerical lists
86 Queue/Usage
86 Top rank per group
86 Walk a directory/Recursively
85 CSV to HTML translation
85 Hello world/Line printer
85 Literals/Floating point
85 Munchausen numbers
85 Read a specific line from a file
85 SEDOLs
85 Word wrap
84 Closures/Value capture
84 File modification time
84 Here document
84 Playing cards
84 Proper divisors
84 Sorting algorithms/Shell sort
83 Bitmap
83 CRC-32
83 Count the coins
83 Department numbers
83 Find common directory path
83 Introspection
83 Operator precedence
83 Pythagorean triples
83 Singly-linked list/Traversal
83 Spiral matrix
83 Terminal control/Ringing the terminal bell
82 Find the missing permutation
82 Knapsack problem/0-1
82 Lucas-Lehmer test
82 Multifactorial
82 Population count
82 URL encoding
81 Anagrams/Deranged anagrams
81 Concurrent computing
81 Dynamic variable names O O O
81 Extend your language
81 Sockets
81 Soundex
81 Web scraping
80 Fibonacci n-step number sequences
80 Jump anywhere
80 Kaprekar numbers
80 Keyboard input/Obtain a Y or N response
80 Linear congruential generator
80 Long multiplication
80 Man or boy test
80 Pi
80 Roots of unity
80 Show the epoch
80 Sorting algorithms/Comb sort
80 Sorting algorithms/Counting sort
79 Date manipulation
79 Jensen's Device
79 Phrase reversals
79 Semordnilap
79 Strip comments from a string
79 Take notes on the command line
79 Unicode variable names
79 XML/Input
78 100 prisoners
78 15 puzzle game
78 Animation
78 Call an object method
78 Convert seconds to compound duration
78 Empty directory
78 Equilibrium index
78 Execute HQ9+
78 Guess the number/With feedback (player)
78 Magic squares of odd order
78 Parsing/RPN calculator algorithm
78 SHA-1
78 Sudoku
78 Trabb Pardo–Knuth algorithm
78 Write entire file
78 Zeckendorf number representation
77 Angle difference between two bearings
77 Averages/Mean angle
77 Gamma function
77 Hello world/Web server
77 List comprehensions
77 Priority queue
77 Rep-string
77 Rock-paper-scissors
77 Sort disjoint sublist
77 Thue-Morse
76 Calendar
76 Euler's sum of powers conjecture
76 Flow-control structures
76 Non-decimal radices/Output
76 Old lady swallowed a fly
76 Quaternion type
76 Read a configuration file
76 Singly-linked list/Element definition
76 Special characters
76 Square but not cube
76 Vigenère cipher
75 AKS test for primes
75 Combinations with repetitions
75 Draw a sphere
75 Multiple distinct objects
74 Benford's law
74 Call a foreign-language function
74 Currying
74 Enforced immutability
74 Four bit adder
74 Pernicious numbers
74 SHA-256
74 Stair-climbing puzzle
73 Additive primes
73 Exceptions/Catch an exception thrown in a nested call
73 Fractal tree
73 Longest common subsequence
73 Sequence of primes by trial division
73 Sort three variables
73 Special variables
73 Unix/ls
73 Van der Corput sequence
73 Write float arrays to a text file
72 Attractive numbers
72 Barnsley fern
72 Bitmap/Bresenham's line algorithm
72 Damm algorithm
72 General FizzBuzz
72 Horizontal sundial calculations
72 IBAN
72 Jewels and stones
72 Largest int from concatenated ints
72 Maze generation
72 Narcissistic decimal number
72 Sorting algorithms/Stooge sort
71 Amb
71 Arithmetic/Rational
71 Catalan numbers/Pascal's triangle
71 Chinese remainder theorem
71 Fork
71 Get system command output
71 I before E except after C
71 Numerical integration
71 Polymorphism
71 Self-describing numbers
71 Sorting algorithms/Pancake sort
71 Text processing/Max licenses in use
70 Closest-pair problem
70 Constrained random points on a circle
70 Fast Fourier transform
70 Named parameters O O
70 Nested function
70 Runtime evaluation O O
70 Stern-Brocot sequence
70 Van Eck sequence
70 Yin and yang
69 Euler method
69 Exponentiation order
69 Morse code
69 One of n lines in a file
69 Probabilistic choice
69 Singly-linked list/Element insertion
69 Tic-tac-toe
69 Variable size/Get
69 Word frequency
68 Abundant odd numbers
68 Best shuffle
68 Circles of given radius through two points
68 Continued fraction
68 Host introspection
68 ISBN13 check digit
68 Remove lines from a file
68 Sort stability
68 Strip control codes and extended characters from a string
67 Documentation
67 Extract file extension
67 Factors of a Mersenne number
67 Integer overflow
67 Memory allocation
67 Plot coordinate pairs
67 Roots of a function
67 Write language name in 3D ASCII
66 Animate a pendulum
66 Binary strings
66 CUSIP
66 Determine if a string is collapsible
66 Gapful numbers
66 HTTPS
66 Hofstadter-Conway $10,000 sequence
66 Inheritance/Multiple
66 Optional parameters
66 Reduced row echelon form
66 Semiprime
66 Two sum
66 XML/Output
65 9 billion names of God the integer
65 Cholesky decomposition
65 Dutch national flag problem
65 Globally replace text in several files
65 Knight's tour
65 McNuggets problem
65 Modular exponentiation
65 RPG attributes generator
65 Roots of a quadratic function
65 Subleq
65 Undefined values
64 Averages/Mean time of day
64 Isqrt (integer square root) of X
64 Leonardo numbers
64 Long year
64 Magic 8-ball
64 Miller–Rabin primality test
64 Quickselect algorithm
64 Runge-Kutta method
64 Smith numbers
64 Sorting algorithms/Sleep sort
64 Test a function
63 24 game/Solve
63 Arithmetic evaluation
63 Cartesian product of two or more lists
63 Chinese zodiac
63 Copy stdin to stdout
63 Determine if a string has all the same characters
63 Emirp primes
63 Huffman coding
63 JortSort
63 Knapsack problem/Continuous
63 Longest common prefix
63 Ludic numbers
63 Non-decimal radices/Input
63 Terminal control/Display an extended character
62 2048
62 Bitmap/Write a PPM file
62 Generator/Exponential
62 Knapsack problem/Unbounded
62 Mouse position
62 Partial function application
62 Truncatable primes
61 4-rings or 4-squares puzzle
61 Brownian tree
61 Compile-time calculation
61 Define a primitive data type
61 Draw a clock
61 Draw a cuboid
61 Mad Libs
61 Sorting algorithms/Bead sort
61 Ternary logic
61 Unicode strings
61 User input/Graphical
60 Add a variable to a class instance at runtime O O
60 Base64 decode data
60 FASTA format
60 Fibonacci word
60 Kernighans large earthquake problem
60 Left factorials
60 Matrix-exponentiation operator
60 Pascal matrix generation
60 Topological sort
60 Truncate a file
60 Two identical strings
60 Vector
59 Base64 encode data
59 Deal cards for FreeCell
59 Doubly-linked list/Element definition
59 Draw a pixel
59 Munching squares
59 Nim game
59 Pointers and references
59 Random number generator (device)
59 Sattolo cycle
59 Scope modifiers
59 Stem-and-leaf plot
59 Tau function
59 Terminal control/Coloured text
59 Tokenize a string with escaping
58 Cantor set
58 DNS query
58 Dinesman's multiple-dwelling problem
58 Discordian date
58 Forest fire
58 Fusc sequence
58 Grayscale image
58 Hash join
58 Iterated digits squaring
58 LZW compression
58 Multisplit
58 Odd word problem
58 Remove vowels from a string
58 Singleton
58 Sorting algorithms/Permutation sort
58 Terminal control/Cursor positioning
58 Unbias a random generator
58 Universal Turing machine
57 Bernoulli numbers
57 Convert decimal number to rational
57 Delegates
57 Farey sequence
57 Keyboard input/Keypress check
57 Loops/Increment loop index within loop body
57 Perfect shuffle
57 Rosetta Code/Rank languages by popularity
57 Runtime evaluation/In an environment O O
56 Archimedean spiral
56 Call a function in a shared library
56 Dijkstra's algorithm
56 Extreme floating point values
56 Handle a signal
56 Inverted syntax O
56 Largest proper divisor of n
56 Longest common substring
56 Maximum triangle path sum
56 Modulinos O
56 Stack traces
56 Statistics/Basic
56 Sum of divisors
56 Validate International Securities Identification Number
56 XML/XPath
55 Associative array/Merging
55 Find the intersection of two lines
55 Loops/With multiple ranges
55 Non-continuous subsequences
55 Pig the dice game
55 Primality by Wilson's theorem
55 Search a list of records
55 Send email
55 Seven-sided dice from five-sided dice
55 Shoelace formula for polygonal area
55 Sort numbers lexicographically
55 Strip block comments
55 Sum of first n cubes
55 Synchronous concurrency
54 Abbreviations, automatic
54 Bell numbers
54 Chaos game
54 Determine if a string has all unique characters
54 Determine if a string is squeezable
54 First-class functions/Use numbers analogously
54 Move-to-front algorithm
54 Password generator
54 Polynomial regression
54 Rate counter
54 Recaman's sequence
54 Tau number
54 Text processing/2
54 Water collected between towers
54 Wireworld
54 XML/DOM serialization
53 Days between dates
53 Dining philosophers
53 Doubly-linked list/Element insertion
53 Egyptian division
53 Fractran
53 Gaussian elimination
53 Heronian triangles
53 Hofstadter Figure-Figure sequences
53 Jaro similarity
53 Longest increasing subsequence
53 Strange plus numbers
53 Zebra puzzle
52 Colour bars/Display
52 Convex hull
52 Determinant and permanent
52 Extensible prime generator
52 Holidays related to Easter
52 Kronecker product
52 Longest string challenge
52 Make directory path
52 Metaprogramming O
52 Naming conventions
52 Sierpinski triangle/Graphical
52 Text processing/1
52 Words containing "the" substring
51 Aliquot sequence classifications
51 Doubly-linked list/Traversal
51 Execute a Markov algorithm
51 GUI component interaction
51 Respond to an unknown method call O O
51 Text between
50 Append a record to the end of a text file
50 Average loop length
50 Digital root/Multiplicative digital root
50 Echo server
50 Floyd-Warshall algorithm
50 Greyscale bars/Display
50 Last letter-first letter
50 Perfect totient numbers
50 Stable marriage problem
50 Taxicab numbers
50 Totient function
50 Visualize a tree
49 Chowla numbers
49 Doubly-linked list/Definition
49 Element-wise operations
49 History variables
49 Mertens function
49 OpenGL
49 Polymorphic copy
49 Polynomial long division
49 Sorting algorithms/Radix sort
49 Sparkline in unicode
49 Ulam spiral (for primes)
49 Verify distribution uniformity/Naive
48 Abbreviations, easy
48 Active object
48 Bitmap/Flood fill
48 Determine if only one instance is running
48 Elementary cellular automaton
48 Generate Chess960 starting position
48 Image noise
48 Musical scale
48 Send an unknown method call O O
48 Start from a main routine O O O
48 Sum of the digits of n is substring of n
48 Variable size/Set
47 Bioinformatics/base count
47 Bitmap/Read a PPM file
47 Currency
47 Deepcopy
47 Hilbert curve
47 Narcissist
47 Problem of Apollonius
47 Set consolidation
47 Spinning rod animation/Text
47 Sum to 100
47 UTF-8 encode and decode
46 21 game
46 Approximate equality
46 Bulls and cows/Player
46 Casting out nines
46 Color of a screen pixel
46 Compiler/lexical analyzer
46 Flipping bits game
46 Keyboard input/Flush the keyboard buffer
46 Knapsack problem/Bounded
46 Parsing/Shunting-yard algorithm
46 Permutations/Derangements
46 Rosetta Code/Count examples
46 Sorting Algorithms/Circle Sort
46 Speech synthesis
46 Subtractive generator
46 Terminal control/Dimensions
46 The Name Game
46 Twelve statements
45 Atomic updates
45 Bitmap/Midpoint circle algorithm
45 Brazilian numbers
45 Carmichael 3 strong pseudoprimes
45 Colour pinstripe/Display
45 Fivenum
45 GUI/Maximum window dimensions
45 Halt and catch fire
45 Loops/Wrong ranges
45 Permutations by swapping
45 Sailors, coconuts and a monkey problem
45 Secure temporary file
45 Smallest square that begins with n
45 Sorting algorithms/Patience sort
45 Truth table
44 ABC words
44 Balanced ternary
44 Base 16 numbers needing a to f
44 Coprimes
44 Cycle detection
44 Hickerson series of almost integers
44 Idiomatically determine all the lowercase and uppercase letters
44 Long primes
44 MAC Vendor Lookup
44 MD5/Implementation
44 Numbers divisible by their individual digits, but not by the product of their digits.
44 Pascal's triangle/Puzzle
44 Percentage difference between images
44 Ranking methods
44 Read a file character by character/UTF8
44 S-expressions
44 Sort a list of object identifiers
44 Special divisors
44 Substitution cipher
44 Summarize and say sequence
44 Type detection
44 Voronoi diagram
44 Yellowstone sequence
43 Combinations and permutations
43 Cramer's rule
43 Euler's identity
43 Feigenbaum constant calculation
43 Find words which contains more than 3 e vowels
43 Humble numbers
43 Inverted index
43 Julia set
43 Lah numbers
43 Largest number divisible by its digits
43 Primorial numbers
43 Pythagorean quadruples
43 Safe primes and unsafe primes
43 Strange numbers
43 Table creation/Postal addresses
43 Terminal control/Inverse video
42 Abbreviations, simple
42 Brace expansion
42 Calendar - for "REAL" programmers O O
42 File extension is in extensions list
42 Find the intersection of a line with a plane
42 Four is magic
42 GUI enabling/disabling of controls
42 Magic squares of doubly even order
42 Parallel calculations
42 Permutations with repetitions
42 Prime conspiracy
42 Scope/Function names and labels
42 Sequence: smallest number with exactly n divisors
42 Statistics/Normal distribution
42 Topswops
42 Triplet of three numbers
42 Variable-length quantity
41 Cheryl's birthday
41 Compare length of two strings
41 Create a file on magnetic tape O
41 Display a linear combination
41 Factorions
41 Function prototype O
41 Input/Output for lines of text
41 Input/Output for pairs of numbers
41 Kahan summation
41 Knuth's algorithm S
41 Maze solving
41 Metered concurrency
41 Nice primes
41 Palindrome dates
41 Parametric polymorphism O O
41 Permutation test
41 Product of divisors
41 Ray-casting algorithm
41 Rosetta Code/Find bare lang tags
41 Sorting algorithms/Strand sort
41 Terminal control/Hiding the cursor
41 Vampire number
40 Bitwise IO
40 Cuban primes
40 Find palindromic numbers in both binary and ternary bases
40 Find words which contains all the vowels
40 Integer roots
40 LU decomposition
40 Lychrel numbers
40 Multiple regression
40 Numbers which binary and ternary digit sum are prime
40 Pathological floating point problems
40 Penney's game
40 Primes whose sum of digits is 25
40 Pythagoras tree
40 QR decomposition
40 Sequence: smallest number greater than previous term with exactly n divisors
40 Solve the no connection puzzle
40 Test integerness
39 Apply a digital filter (direct form II transposed)
39 Break OO privacy O
39 Check output device is a terminal
39 Count how many vowels and consonants occur in a string
39 Cousin primes
39 Events
39 Extra primes
39 Fibonacci word/fractal
39 Koch curve
39 Minesweeper game
39 Multi-dimensional array
39 Order disjoint list items
39 Parsing/RPN to infix conversion
39 Pentagram
39 Shift list elements to left by 3
39 Sutherland-Hodgman polygon clipping
39 Terminal control/Unicode output
39 Unique characters
38 Bitmap/Bézier curves/Cubic
38 Church numerals
38 Constrained genericity O O O
38 Determine if two triangles overlap
38 Digit fifth powers
38 Entropy/Narcissist
38 Find prime n such that reversed n is also prime
38 Find prime numbers of the form n*n*n+2
38 Frobenius numbers
38 Longest common suffix
38 Matrix with two diagonals
38 Metronome
38 Minimum number of cells after, before, above and below NxN squares
38 Numerical integration/Gauss-Legendre Quadrature
38 Pinstripe/Display
38 RSA code
38 Square-free integers
38 Subset sum problem
37 Algebraic data types O
37 Arithmetic-geometric mean/Calculate Pi
37 Bacon cipher
37 Chaocipher
37 Conjugate transpose
37 Continued fraction/Arithmetic/Construct from rational number
37 Create an object at a given address
37 Diversity prediction theorem
37 Find words with alternating vowels and consonants
37 MD4
37 Machine code
37 Multiline shebang
37 Mutex O
37 Möbius function
37 Negative base numbers
37 Object serialization
37 Old Russian measure of length
37 Ordered partitions
37 Smarandache prime-digital sequence
37 Strong and weak primes
37 Successive prime differences
37 Sum of elements below main diagonal of matrix
36 AVL tree
36 Circular primes
36 Dice game probabilities
36 Draw a rotating cube
36 Eban numbers
36 Egyptian fractions
36 Faulhaber's triangle
36 First power of 2 that has leading decimal digits of 12
36 Gauss-Jordan matrix inversion
36 Length of an arc between two angles
36 Mersenne primes
36 Modular arithmetic
36 Odd and square numbers
36 Parameterized SQL statement O
36 Pell's equation
36 RIPEMD-160
36 Terminal control/Preserve screen
36 Zumkeller numbers
35 Alternade words
35 Angles (geometric), normalization and conversion
35 Change e letters to i in words
35 Decimal floating point number to binary
35 Galton box animation
35 Minimum positive multiple in base 10 using only 0 and 1
35 Partition an integer x into n primes
35 Poker hand analyser
35 Reflection/List properties O
35 Set puzzle
35 Solve a Hidato puzzle
35 Sorting algorithms/Cycle sort
35 Textonyms
35 Topic variable O O O
35 URL parser
35 Use another language to call a function
35 Word wheel
35 Zhang-Suen thinning algorithm
34 Bitmap/Bézier curves/Quadratic
34 Bitmap/Histogram
34 Check input device is a terminal
34 Death Star
34 Find words whose first and last three letters are equal
34 Mian-Chowla sequence
34 Multiplicative order
34 Numbers with equal rises and falls
34 Numbers with prime digits whose sum is 13
34 Parallel brute force
34 Parse command-line arguments
34 Polyspiral
34 Pseudo-random numbers/Middle-square method
34 Sexy primes
34 Straddling checkerboard
34 Superellipse
34 Terminal control/Cursor movement
34 Twin primes
34 Unprimeable numbers
34 Weird numbers
34 Write to Windows event log
34 Xiaolin Wu's line algorithm
33 10001th prime
33 Bin given limits
33 Bitcoin/address validation
33 Burrows–Wheeler transform
33 Calkin-Wilf sequence
33 Chat server
33 Decision tables
33 Esthetic numbers
33 Executable library
33 Fairshare between two and more
33 Find first missing positive
33 Go Fish
33 Implicit type conversion
33 Jacobi symbol
33 Law of cosines - triples
33 Long literals, with continuations
33 Perlin noise
33 Pierpont primes
33 Pragmatic directives
33 Primes with digits in nondecreasing order
33 Resistor mesh
33 Rosetta Code/Find unimplemented tasks
33 Set of real numbers
33 Show the (decimal) value of a number of 1s appended with a 3, then squared
33 Simple database
33 Strange unique prime triplets
33 Super-d numbers
33 Wieferich primes
33 Word break problem
32 Checkpoint synchronization
32 Chemical calculator
32 Code Golf: Code Golf
32 Common list elements
32 Deconvolution/1D
32 Execute SNUSP
32 FTP
32 Faulhaber's formula
32 Find first and last set bit of a long integer
32 Find square difference
32 Generate random numbers without repeating a value
32 Keyboard macros
32 Mayan numerals
32 Nonoblock
32 Numeric error propagation
32 Peano curve
32 Range consolidation
32 Rosetta Code/Fix code tags
32 Sort the letters of string in alphabetical order
32 Stirling numbers of the second kind
32 Sum and product puzzle
32 Verify distribution uniformity/Chi-squared test
32 Window creation/X11
31 Abelian sandpile model
31 Arena storage pool
31 Chebyshev coefficients
31 Check Machin-like formulas
31 Common sorted list
31 Compiler/virtual machine interpreter
31 First class environments O
31 HTTPS/Authenticated
31 Hunt the Wumpus
31 Magnanimous numbers
31 Memory layout of a data structure
31 Minimum numbers of three lists
31 Numbers in base-16 representation that cannot be written with decimal digits
31 Partition function P
31 Plasma effect
31 Ramsey's theorem
31 State name puzzle
31 Stirling numbers of the first kind
31 Stream merge
31 Summarize primes
31 Sylvester's sequence
31 Update a configuration file
31 Video display modes O
30 A* search algorithm
30 Bioinformatics/Sequence mutation
30 Birthday problem
30 Color wheel
30 De Bruijn sequences
30 Distinct power numbers
30 Fermat numbers
30 Find if a point is within a triangle
30 Formal power series
30 Generate random chess position
30 Honeycombs
30 Increasing gaps between consecutive Niven numbers
30 Kronecker product based fractals
30 Maximum difference between adjacent elements of list
30 Motzkin numbers
30 N-smooth numbers
30 Reflection/List methods O
30 Sierpinski pentagon
30 Table creation
30 Teacup rim text
30 Unique characters in each string
30 Words from neighbour ones
29 Active Directory/Connect
29 Find largest left truncatable prime in a given base
29 Find minimum number of coins that make a given value
29 Finite state machine
29 First perfect square in base n with n unique digits
29 Fraction reduction
29 Harmonic series
29 Merge and aggregate datasets
29 Natural sorting
29 Random Latin squares
29 Safe addition
29 Same fringe
29 Shortest common supersequence
29 Solve a Holy Knight's tour
29 Sorting algorithms/Cocktail sort with shifting bounds
29 Superpermutation minimisation
29 The ISAAC Cipher
29 Thiele's interpolation formula
29 World Cup group stage
28 Almkvist-Giullera formula for pi
28 Card shuffles
28 Cipolla's algorithm
28 Cut a rectangle
28 Day of the week of Christmas and New Year
28 Distributed programming
28 Doomsday rule
28 Find squares n where n+1 is prime
28 Fixed length records
28 Image convolution
28 Intersecting number wheels
28 Minimum multiple of m where digital sum equals m
28 Monads/Maybe monad
28 Nautical bell
28 Numbers with same digit set in base 10 and base 16
28 Palindromic gapful numbers
28 Paraffins
28 Sierpinski arrowhead curve
28 Snake and Ladder
28 Sunflower fractal
28 Tonelli-Shanks algorithm
28 Welch's t-test
28 Yahoo! search interface
27 Audio alarm
27 Base58Check encoding
27 Biorhythms
27 Changeable words
27 Coprime triplets
27 Elliptic curve arithmetic
27 Exactly three adjacent 3 in lists
27 First 9 prime Fibonacci number
27 Function frequency
27 Idiomatically determine all the characters that can be used for symbols
27 Kolakoski sequence
27 Largest five adjacent number
27 Matrix chain multiplication
27 Neighbour primes
27 Next highest int from digits
27 Numbers in base 10 that are palindromic in bases 2, 4, and 16
27 Numeric separator syntax
27 Percolation/Mean run density
27 Piprimes
27 Ramer-Douglas-Peucker line simplification
27 Self numbers
27 Sequence of primorial primes
27 Simulate input/Keyboard
27 Sleeping Beauty problem
27 Total circles area
27 UPC
26 Deming's Funnel
26 Exponentiation with infix operators in (or operating on) the base
26 Hough transform
26 K-means++ clustering
26 Largest prime factor
26 Linux CPU utilization
26 List rooted trees
26 Lucky and even lucky numbers
26 Magic squares of singly even order
26 Make a backup file
26 Markov chain text generator
26 Mind boggling card trick
26 Mosaic matrix
26 Odd words
26 Order by pair comparisons
26 Padovan sequence
26 Palindromic primes
26 Parse an IP Address
26 Permutations/Rank of a permutation
26 Playfair cipher
26 Positive decimal integers with the digit 1 occurring exactly twice
26 Pseudo-random numbers/PCG32
26 RCRPG
26 Reverse the gender of a string
26 Special neighbor primes
26 Spelling of ordinal numbers
26 Sum of primes in odd positions is prime
26 Sum of square and cube digits of an integer are primes
25 15 puzzle solver
25 ASCII art diagram converter
25 Abelian sandpile model/Identity
25 Append numbers at same position in strings
25 Cistercian numerals
25 Consecutive primes with ascending or descending differences
25 Create an object/Native demonstration
25 Elementary cellular automaton/Random Number Generator
25 Erdős-primes
25 File size distribution
25 Find words which contain the most consonants
25 Index finite lists of positive integers
25 Joystick position O
25 Kosaraju
25 Mastermind
25 Monads/List monad
25 Odd squarefree semiprimes
25 Palindromic primes in base 16
25 Play recorded sounds
25 Prime numbers which contain 123
25 Pseudo-random numbers/Xorshift star
25 Record sound
25 Reflection/Get source O
25 Reverse the order of lines in a text file while preserving the contents of each line
25 SOAP
25 Smallest power of 6 whose decimal expansion contains n
25 Solve a Hopido puzzle
25 Solve a Numbrix puzzle
25 Summation of primes
25 Ulam numbers
24 Active Directory/Search for a user
24 Addition chains
24 Assertions in design by contract
24 Bilinear interpolation
24 Canonicalize CIDR
24 Commatizing numbers
24 Compiler/syntax analyzer
24 EKG sequence convergence
24 Levenshtein distance/Alignment
24 Main step of GOST 28147-89
24 Native shebang
24 Next special primes
24 Orbital elements
24 Perceptron
24 Permuted multiples
24 Prime triplets
24 Prime words
24 Rare numbers
24 Sequence: nth number with exactly n divisors
24 Sine wave
24 Smallest multiple
24 Snake
24 Sokoban
24 Solve triangle solitare puzzle
24 Sum data type
24 Untrusted environment
23 Compiler/code generator
23 Concatenate two primes is also prime
23 Find adjacent primes which differ by a square integer
23 Find duplicate files
23 Knuth's power tree
23 Line circle intersection
23 Median filter
23 Names to numbers
23 Nested templated data
23 Pig the dice game/Player
23 Polynomial synthetic division
23 Singly-linked list/Element removal
23 Substring primes
23 Variable declaration reset
23 Vigenère cipher/Cryptanalysis
23 Vogel's approximation method
23 Wilson primes of order n
23 Zeckendorf arithmetic
22 Ascending primes
22 Bitcoin/public point to address
22 Cubic special primes
22 Data Encryption Standard
22 Eertree
22 Elementary cellular automaton/Infinite length
22 Four sides of square
22 Jacobsthal numbers
22 Last list item
22 Latin Squares in reduced form
22 Metallic ratios
22 Montgomery reduction
22 N-body problem
22 Nonogram solver
22 Numbers whose count of divisors is prime
22 Peaceful chess queen armies
22 Primes whose first and last number is 3
22 Print debugging statement
22 Pseudo-random numbers/Combined recursive generator MRG32k3a
22 Pseudo-random numbers/Splitmix64
22 Quadrat special primes
22 Sierpinski curve
22 Simulate input/Mouse
22 Steady squares
22 The sieve of Sundaram
22 Vibrating rectangles
22 Window management
21 Arithmetic coding/As a generalized change of radix
21 Cyclotomic polynomial
21 Disarium numbers
21 Draw pixel 2
21 Getting the number of decimals
21 Imaginary base numbers
21 Jaro-Winkler distance
21 Juggler sequence
21 Just in time processing on a character stream
21 K-d tree
21 Largest difference between adjacent primes
21 Longest substrings without repeating characters
21 Matrix digital rain
21 Nimber arithmetic
21 Padovan n-step number sequences
21 Pancake numbers
21 Percolation/Site percolation
21 Practical numbers
21 Primes - allocate descendants to their ancestors
21 Primes which contain only one odd digit
21 Readline interface
21 Separate the house number from the street name
21 Special factorials
21 Special pythagorean triplet
21 Transportation problem
21 Useless instructions
20 Air mass
20 Color quantization
20 Descending primes
20 Logistic curve fitting in epidemiology
20 Monads/Writer monad
20 Most frequent k chars distance
20 P-value correction
20 Percolation/Mean cluster density
20 Print itself O
20 SQL-based authentication
20 Selective file copy
20 Terminal control/Positional read O
20 Word ladder
20 Word search
20 Wordle comparison
19 Bitmap/Read an image through a pipe
19 Brilliant numbers
19 Chernick's Carmichael numbers
19 Code segment unload
19 Compare sorting algorithms' performance
19 Compiler/AST interpreter
19 Cullen and Woodall numbers
19 Cyclops numbers
19 Determine sentence type
19 Euler's constant 0.5772...
19 Find URI in text
19 HTTPS/Client-authenticated
19 Largest palindrome product
19 Largest product in a grid
19 Minimum primes
19 Own digits power sum
19 Permutations with some identical elements
19 Proof O
19 SHA-256 Merkle tree
19 Self-hosting compiler
19 Simulated annealing
19 Square root by hand
19 Tarjan
18 Arithmetic numbers
18 Aspect oriented programming
18 Banker's algorithm
18 Bitmap/PPM conversion through a pipe
18 Collect and sort square numbers in ascending order from three lists
18 Deceptive numbers
18 Free polyominoes enumeration
18 Legendre prime counting function
18 Minimal steps down to 1
18 Modified random distribution
18 NYSIIS
18 Numerical integration/Adaptive Simpson's method
18 Particle swarm optimization
18 Percolation/Bond percolation
18 Prime numbers p for which the sum of primes less than or equal to p is prime
18 Quoting constructs
18 Ramanujan's constant
18 Rendezvous
18 Retrieve and search chat history
18 Safe mode
18 Sierpinski square curve
18 Smallest numbers
18 Suffix tree
18 Sum of two adjacent numbers are primes
18 Two bullet roulette
18 VList O
18 XML validation
17 Bioinformatics/Subsequence
17 Canny edge detector
17 Fortunate numbers
17 Four is the number of letters in the ...
17 Geometric algebra
17 Longest palindromic substrings
17 Magic constant
17 Pseudorandom number generator image
17 Safe and Sophie Germain primes
16 Curzon numbers
16 Distribution of 0 digits in factorial series
16 Interactive help
16 Long stairs
16 Non-transitive dice
16 OpenWebNet password
16 Overloaded operators
16 Pandigital prime
16 Periodic table
16 Run as a daemon or service
16 Sort primes from list to a list
16 Sorting algorithms/Tree sort on a linked list
16 Text completion
16 Three word location
16 Topological sort/Extracted top item
16 Tree from nesting levels
15 Achilles numbers
15 Camel case and snake case
15 Continued fraction/Arithmetic/G(matrix ng, continued fraction n)
15 Curve that touches three points
15 Factorial base numbers indexing permutations of a collection
15 Functional coverage tree
15 Geohash
15 Goldbach's comet
15 Gradient descent
15 Minkowski question-mark function
15 Multi-base primes
15 Pisano period
15 Prime triangle
15 Rodrigues’ rotation formula
15 Ruth-Aaron numbers
15 Untouchable numbers
15 XXXX redacted
14 Audio frequency generator O
14 Checksumcolor
14 Colorful numbers
14 Composite numbers k with no single digit factors whose factors are all substrings of k
14 Conjugate a Latin verb
14 Deconvolution/2D+
14 Display an outline as a nested table
14 Duffinian numbers
14 Generalised floating point addition
14 Greed
14 Hourglass puzzle
14 Launch rocket with countdown and acceleration in stdout
14 One-time pad
14 Penrose tiling
14 Pentomino tiling
14 Rhonda numbers
14 Selectively replace multiple instances of a character within a string
14 Tetris
14 Tropical algebra overloading
14 Unit testing
14 Using a speech engine to highlight words
14 Verhoeff algorithm
13 Catmull–Clark subdivision surface
13 Colour pinstripe/Printer O
13 Earliest difference between prime gaps
13 Execute CopyPasta Language
13 Graph colouring
13 Hex words
13 Iterators
13 Polynomial derivative
13 Powerful numbers
13 Railway circuit
13 Spoof game
13 Time-based one-time password algorithm
13 War card game
12 Combinations with repetitions/Square digit chain
12 Distinct palindromes within decimal numbers
12 Equal prime and composite sums
12 Euclid-Mullin sequence
12 External sort
12 Faces from a mesh
12 Fibonacci matrix-exponentiation
12 French Republican calendar
12 Home primes
12 Mayan calendar
12 Morpion solitaire
12 Pinstripe/Printer O
12 Range modifications
12 Rosetta Code/Rank languages by number of users
12 Rosetta Code/Tasks without examples
12 Solve hanging lantern problem
12 Suffixation of decimal numbers
12 Terminal control/Restricted width positional input/No wrapping
12 Tree datastructures
11 Anadromes
11 Bioinformatics/Global alignment
11 Brace expansion using ranges
11 Count the coins/0-1
11 Erdös-Selfridge categorization of primes
11 IPC via named pipe
11 Numerical and alphabetical suffixes
11 OpenGL/Utah Teapot
11 Parse EBNF
11 Ramanujan primes
11 Repunit primes
11 Resistance calculator
11 Round-robin tournament schedule
11 Set right-adjacent bits
11 Simple turtle graphics
11 Square form factorization
11 Starting a web browser
11 Terminal control/Restricted width positional input/With wrapping
11 URL shortener
11 Wordiff
10 16 puzzle game
10 ADFGVX cipher
10 Discrete Fourier transform
10 Elliptic Curve Digital Signature Algorithm
10 Find Chess960 starting position identifier
10 Integer long division
10 Jaccard index
10 Resistance network calculator
10 Robots
10 Solve equations with substitution method
10 Sort an outline at every level
10 Text to HTML
10 User defined pipe and redirection operators
9 B-spline
9 Compiler/Verifying syntax
9 Continued fraction/Arithmetic/G(matrix ng, continued fraction n1, continued fraction n2)
9 Doubly-linked list/Element removal
9 Fibonacci heap
9 Multidimensional Newton-Raphson method
9 Numbers which are not the sum of distinct squares
9 OpenGL pixel shader
9 Price list behind API
9 Ramanujan primes/twins
9 Rosetta Code/Run examples
9 Smallest enclosing circle problem
9 Tamagotchi emulator
8 Addition-chain exponentiation
8 Audio overlap loop
8 Dating agency
8 Hexapawn
8 Horse racing
8 N-queens minimum and knights and bishops
8 P-Adic numbers, basic
8 Pell numbers
8 Random sentence from book
8 Raster bars
8 Recursive descent parser generator
8 Remote agent/Agent logic
8 Remote agent/Simulation
8 Search in paragraph's text
8 Segmentation fault protection
8 Strassen's algorithm
8 Ultra useful primes
8 Waveform analysis/Doh ray me O
8 WiktionaryDumps to words
7 Babylonian spiral
7 Black Box
7 Boids
7 Chess player
7 I'm a software engineer, get me out of here
7 Isograms and heterograms
7 Latin Squares in reduced form/Randomizing using Jacobson and Matthews’ Technique
7 Peripheral drift illusion
7 Process SMIL directives in XML data
7 Remote agent/Agent interface
7 Worthwhile task shaving
6 Compiler/Simple file inclusion pre processor
6 Create your own text control codes
6 Divide a rectangle into a number of unequal triangles
6 OLE automation O
6 P-Adic square roots
6 Particle fountain
6 Red black tree sort
6 Smallest number k such that k+2^m is composite for all m less than k
6 Solve a Rubik's Cube
6 Use a REST API
5 Autogram checker
5 Cycles of a permutation
5 Dominoes
5 Erdős–Woods numbers
5 Execute Computer/Zero
5 Generalised floating point multiplication
5 Multiton
5 Number triplets game
5 Rosetta Code/List authors of task descriptions
5 Solving coin problems
5 Unicode polynomial equation
5 Waveform analysis/Top and tail O
5 Weather routing
4 15 puzzle game in 3D
4 Blackjack strategy
4 CLI-based maze-game
4 Diophantine linear system solving
4 IRC gateway
4 Transliterate English text using the Greek alphabet
4 Ukkonen’s suffix tree construction
4 Uno (Card Game)
4 Vidir
3 3d turtle graphics
3 Compiler/Preprocessor
3 Cross compilation
3 Elevator simulation
3 Sanitize user input
3 WebGL rotating F