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Rosetta Code/Count examples/Full list/Tier 2

From Rosetta Code

Second 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
Second ten programming languages by number of task examples completed:
    ⑪ Kotlin        ⑫ Java          ⑬ Haskell       ⑭ Mathematica   ⑮ Racket       
    ⑯ Ruby          ⑰ C++           ⑱ J             ⑲ Zkl           ⑳ FreeBASIC    
As of 2022-01-23T21:12:27Z :: Tasks: 1147 :: Draft Tasks:355 :: Total Tasks: 1502 :: Total Examples: 83650
Count Task
515 Hello world/Text
336 99 bottles of beer
332 FizzBuzz
324 100 doors
301 Fibonacci sequence
296 Factorial
281 Comments
271 A+B
268 Empty program
244 Function definition
240 Loops/Infinite
235 Reverse a string
234 Loops/While
233 Arrays
231 Ackermann function
220 Loops/For
211 Conditional structures
210 Greatest common divisor
205 Arithmetic/Integer
204 Greatest element of a list
199 Even or odd
196 Array concatenation
192 Integer comparison
192 Repeat a string
189 Averages/Arithmetic mean
186 Increment a numerical string
185 Sieve of Eratosthenes
183 Copy a string
182 Hello world/Graphical
176 Boolean values
175 Binary digits
174 Array length
174 Loops/Downward for
172 Sum and product of an array
172 Towers of Hanoi
171 Character codes
170 Apply a callback to an array
170 Integer sequence
170 String concatenation
169 String length
168 Loops/Do-while
168 Loops/For with a specified step
168 Loops/N plus one half
168 Palindrome detection
167 Hello world/Newline omission
167 Loops/Foreach
167 Rot-13
167 Tokenize a string
165 Sum of a series
164 Generic swap
164 Loops/Break
164 String case
163 Empty string
161 Sum of squares
160 Leap year
159 Dot product
159 Quine
158 Hailstone sequence
157 Logical operations
156 Filter
155 Sorting algorithms/Bubble sort
154 Associative array/Creation
154 Factors of an integer
153 Caesar cipher
153 Sort an integer array
152 Roman numerals/Encode
150 Execute a system command
149 System time
148 Remove duplicate elements
147 Loop over multiple arrays simultaneously
146 Determine if a string is numeric
146 Higher-order functions
146 Stack
145 Guess the number
144 Sorting algorithms/Quicksort
143 Primality by trial division
142 Bitwise operations
142 Luhn test of credit card numbers
142 User input/Text
141 Command-line arguments
141 File input/output
141 Generate lower case ASCII alphabet
140 Happy numbers
140 Hello world/Standard error
139 Mutual recursion
139 Substring
138 Read entire file
138 Zero to the zero power
137 Check that file exists
137 Day of the week
135 Create a file
135 Loops/Continue
134 Pascal's triangle
133 ABC problem
133 Balanced brackets
133 Least common multiple
133 Sleep
132 Ethiopian multiplication
131 Literals/String
131 Variables
130 Date format
130 Flatten a list
129 Program termination
128 Include a file
127 Binary search
127 Compound data type
126 Knuth shuffle
126 Literals/Integer
126 N-queens problem
126 Roman numerals/Decode
125 Count in octal
125 Detect division by zero
125 Function composition
125 Loops/Nested
125 Read a file line by line
125 Sorting algorithms/Insertion sort
124 Count occurrences of a substring
124 Formatted numeric output
124 Mandelbrot set
123 Matrix multiplication
123 Matrix transposition
122 Associative array/Iteration
122 Averages/Root mean square
122 Null object
122 Pick random element
121 Case-sensitivity of identifiers
121 Multiplication tables
121 Return multiple values
120 Anagrams
120 Haversine formula
120 Letter frequency
120 Search a list
119 Align columns
119 Guess the number/With feedback
119 Identity matrix
118 Averages/Median
118 Hash from two arrays
118 Look-and-say sequence
118 Real constants and functions
117 Classes O
117 Delete a file
117 File size
117 String matching
116 Assertions
116 Babbage problem
116 Environment variables
116 Find limit of recursion
116 Pangram checker
116 Perfect numbers
115 HTTP
115 Input loop
115 Rename a file
114 Conway's Game of Life
113 Arithmetic/Complex
113 Sierpinski triangle
112 Catalan numbers
112 Random numbers
111 Evaluate binomial coefficients
111 Hostname
111 Infinity
111 Strip a set of characters from a string
110 Accumulator factory
110 Anonymous recursion
110 Levenshtein distance
110 Substring/Top and tail
110 Variadic function
109 Arithmetic-geometric mean
109 Permutations
109 Reverse words in a string
109 Run-length encoding
109 String append
109 Temperature conversion
108 Averages/Pythagorean means
108 Harshad or Niven series
108 Horner's rule for polynomial evaluation
107 Comma quibbling
107 The Twelve Days of Christmas
107 Zig-zag matrix
106 Bulls and cows
106 Prime decomposition
106 Program name
106 String interpolation (included)
106 Strip whitespace from a string/Top and tail
105 Nth root
105 Regular expressions
105 Sorting algorithms/Merge sort
104 Call a function
104 Combinations
104 Create a two-dimensional array at runtime
104 Exceptions
104 N'th
104 Ordered words
104 Queue/Definition
104 Sorting algorithms/Selection sort
104 Sum multiples of 3 and 5
104 Vector products
103 Trigonometric functions
102 Sierpinski carpet
102 Sum digits of an integer
101 Digital root
101 Middle three digits
101 Shell one-liner O
101 Short-circuit evaluation
100 Power set
100 String prepend
99 24 game
99 Abundant, deficient and perfect number classifications
99 Arbitrary-precision integers (included)
99 Execute Brain****
99 Sorting algorithms/Gnome sort
98 Enumerations
98 Interactive programming O
98 Range extraction
98 Walk a directory/Non-recursively
98 Y combinator
97 Evolutionary algorithm
97 Range expansion
97 Sequence of non-squares
96 Collections
96 Create an HTML table
96 Sorting algorithms/Cocktail sort
95 Amicable pairs
95 Dragon curve
95 Exponentiation operator
95 First-class functions
95 Hello world/Newbie
95 Hofstadter Q sequence
95 Time a function
94 Averages/Mode
94 One-dimensional cellular automata
94 Random number generator (included)
94 Symmetric difference
93 Almost prime
93 MD5
93 Sort using a custom comparator
92 Cumulative standard deviation
92 Forward difference
92 Inheritance/Single O
92 Sorting algorithms/Bogosort
91 Entropy
91 Langton's ant
91 Monty Hall problem
91 Number names
91 Number reversal game
90 Averages/Simple moving average
90 CSV data manipulation
90 Calculating the value of e
90 Catamorphism
90 Gray code
90 JSON
90 Price fraction
90 Sorting algorithms/Heapsort
90 String comparison
90 Tree traversal
89 Hamming numbers
89 Josephus problem
89 Map range
89 Menu
88 Compare a list of strings
88 Five weekends
88 Floyd's triangle
88 Greatest subsequential sum
88 Last Friday of each month
88 Simple windowed application
87 Abstract type
87 Non-decimal radices/Convert
87 Sort an array of composite structures
87 Terminal control/Clear the screen
86 Queue/Usage
86 Walk a directory/Recursively
85 Address of a variable O O O
85 CSV to HTML translation
85 Count in factors
85 Monte Carlo methods
85 SEDOLs
85 Set
85 Show ASCII table
84 Closures/Value capture
84 Find the last Sunday of each month
84 Order two numerical lists
84 Read a specific line from a file
84 Repeat
84 Split a character string based on change of character
84 Top rank per group
84 URL decoding
84 Window creation
83 Anti-primes
83 Bitmap
83 Box the compass
83 File modification time
83 Hello world/Line printer
83 Munchausen numbers
83 Playing cards
83 Sorting algorithms/Shell sort
83 Terminal control/Ringing the terminal bell
83 Word wrap
82 Here document O
82 Introspection
81 Multifactorial
81 Operator precedence
81 Proper divisors
81 Pythagorean triples
81 Web scraping
80 CRC-32
80 Count the coins
80 Find common directory path
80 Literals/Floating point
80 Long multiplication
80 Lucas-Lehmer test
80 Population count
80 Roots of unity
80 Singly-linked list/Traversal
80 Sockets
80 Sorting algorithms/Counting sort
80 Spiral matrix
79 Concurrent computing
79 Date manipulation
79 Dynamic variable names O
79 Find the missing permutation
79 Jensen's Device
79 Keyboard input/Obtain a Y or N response
79 Show the epoch
79 Soundex
79 URL encoding
79 XML/Input
78 Call an object method O
78 Execute HQ9+
78 Fibonacci n-step number sequences
78 Kaprekar numbers
78 Linear congruential generator
78 Modular inverse
78 Strip comments from a string
78 Unicode variable names O
77 Knapsack problem/0-1
77 Parsing/RPN calculator algorithm
77 Phrase reversals
77 Semordnilap
77 Sorting algorithms/Comb sort
77 Thue-Morse
77 Write entire file
76 Averages/Mean angle
76 Empty directory
76 Equilibrium index
76 Flow-control structures
76 Hello world/Web server
76 Non-decimal radices/Output
76 Pi
76 Rock-paper-scissors
76 SHA-1
76 Sort disjoint sublist
76 Sudoku
76 Take notes on the command line
76 Trabb Pardo–Knuth algorithm
76 Vigenère cipher
76 Zeckendorf number representation
75 Anagrams/Deranged anagrams
75 Animation
75 Calendar
75 Combinations with repetitions
75 Department numbers
75 Guess the number/With feedback (player)
75 Man or boy test
75 Multiple distinct objects
75 Read a configuration file
75 Rep-string
75 Special characters
74 AKS test for primes
74 Convert seconds to compound duration
74 Currying
74 Enforced immutability
74 Euler's sum of powers conjecture
74 Four bit adder
74 Gamma function
74 Jump anywhere
74 List comprehensions
74 Long year
74 Quaternion type
74 Singly-linked list/Element definition
73 15 puzzle game
73 Exceptions/Catch an exception thrown in a nested call
73 Fractal tree
73 Old lady swallowed a fly
73 Pernicious numbers
73 SHA-256
73 Square but not cube
73 Stair-climbing puzzle
72 100 prisoners
72 Bitmap/Bresenham's line algorithm
72 Draw a sphere
72 Extend your language O
72 Longest common subsequence
72 Priority queue
72 Sort three variables
71 Benford's law
71 Call a foreign-language function
71 Catalan numbers/Pascal's triangle
71 Horizontal sundial calculations
71 IBAN
71 Maze generation
71 Narcissistic decimal number
71 Polymorphism O
71 Sorting algorithms/Stooge sort
71 Special variables
71 Unix/ls
71 Van der Corput sequence
70 Arithmetic/Rational
70 Barnsley fern
70 Closest-pair problem
70 Constrained random points on a circle
70 Fork
70 Largest int from concatenated ints
70 Named parameters O
70 Nested function
70 Numerical integration
70 Self-describing numbers
70 Sequence of primes by trial division
70 Sorting algorithms/Pancake sort
70 Text processing/Max licenses in use
70 Write float arrays to a text file
70 Yin and yang
69 Angle difference between two bearings
69 Attractive numbers
69 General FizzBuzz
69 Magic squares of odd order
68 Amb
68 Chinese remainder theorem
68 Damm algorithm
68 Euler method
68 Exponentiation order
68 Fast Fourier transform
68 Hofstadter-Conway $10,000 sequence
68 Jewels and stones
68 Morse code
68 Remove lines from a file
68 Runtime evaluation O O
68 Sort stability
68 Strip control codes and extended characters from a string
67 Circles of given radius through two points
67 One of n lines in a file
67 Roots of a function
67 Semiprime
67 Stern-Brocot sequence
67 Write language name in 3D ASCII
66 Abundant odd numbers
66 Continued fraction
66 Documentation
66 Factors of a Mersenne number
66 HTTPS
66 ISBN13 check digit
66 Inheritance/Multiple O
66 Memory allocation
66 Optional parameters
66 Van Eck sequence
66 Variable size/Get O
66 Word frequency
66 XML/Output
65 Best shuffle
65 Binary strings
65 Get system command output
65 Host introspection
65 Modular exponentiation
65 Plot coordinate pairs
65 Probabilistic choice
65 Roots of a quadratic function
65 Singly-linked list/Element insertion
65 Tic-tac-toe
64 Animate a pendulum
64 Cholesky decomposition
64 Extract file extension
64 I before E except after C
64 Integer overflow
64 Miller–Rabin primality test
64 Reduced row echelon form
64 Subleq
64 Undefined values
63 CUSIP
63 Globally replace text in several files
63 Magic 8-ball
63 Non-decimal radices/Input
63 Runge-Kutta method
63 Sorting algorithms/Sleep sort
63 Two sum
62 24 game/Solve
62 Arithmetic evaluation
62 Averages/Mean time of day
62 Bitmap/Write a PPM file
62 Cartesian product of two or more lists
62 Dutch national flag problem
62 Emirp primes
62 Gapful numbers
62 Generator/Exponential
62 Longest common prefix
62 Mouse position
62 Partial function application
62 Smith numbers
62 Terminal control/Display an extended character
62 Test a function
62 Truncatable primes
61 2048
61 9 billion names of God the integer
61 Compile-time calculation O O
61 Determine if a string is collapsible
61 Draw a clock
61 Huffman coding
61 Ludic numbers
61 Sorting algorithms/Bead sort
61 Unicode strings
61 User input/Graphical
60 4-rings or 4-squares puzzle
60 Add a variable to a class instance at runtime O O O
60 Brownian tree
60 Determine if a string has all the same characters
60 JortSort
60 Knapsack problem/Continuous
60 Knapsack problem/Unbounded
60 Left factorials
60 Leonardo numbers
60 Matrix-exponentiation operator O
60 McNuggets problem
60 Pascal matrix generation
59 Additive primes
59 Base64 encode data
59 Define a primitive data type O
59 Doubly-linked list/Element definition
59 Draw a cuboid
59 Knight's tour
59 Pointers and references O O
59 RPG attributes generator
59 Random number generator (device)
59 Scope modifiers
59 Sierpinski triangle/Graphical
59 Stem-and-leaf plot
59 Terminal control/Coloured text
59 Ternary logic
59 Truncate a file
58 Chinese zodiac
58 Deal cards for FreeCell
58 Discordian date
58 Fibonacci word
58 Grayscale image
58 Hash join
58 Mad Libs
58 Multisplit
58 Odd word problem O
58 Quickselect algorithm
58 Tau function
58 Terminal control/Cursor positioning
58 Unbias a random generator
58 Vector
57 Base64 decode data
57 Convert decimal number to rational
57 DNS query O
57 Delegates
57 Dinesman's multiple-dwelling problem
57 Iterated digits squaring
57 Kernighans large earthquake problem
57 LZW compression
57 Munching squares
57 Rosetta Code/Rank languages by popularity
57 Singleton O O
57 Sorting algorithms/Permutation sort
57 Topological sort
57 Universal Turing machine
56 Bernoulli numbers
56 Call a function in a shared library
56 Cantor set
56 Copy stdin to stdout
56 Dijkstra's algorithm
56 Draw a pixel
56 Extreme floating point values
56 FASTA format
56 Forest fire
56 Keyboard input/Keypress check
56 Modulinos
56 Perfect shuffle
56 Runtime evaluation/In an environment O
56 Sattolo cycle
56 Stack traces
56 Tokenize a string with escaping
56 Two identical strings
56 XML/XPath
55 Archimedean spiral
55 Inverted syntax
55 Longest common substring
55 Loops/Increment loop index within loop body
55 Sort numbers lexicographically
55 Statistics/Basic
55 Synchronous concurrency
55 Validate International Securities Identification Number
54 Handle a signal O
54 Maximum triangle path sum
54 Nim game
54 Non-continuous subsequences
54 Password generator
54 Pig the dice game
54 Search a list of records
54 Seven-sided dice from five-sided dice
54 Shoelace formula for polygonal area
54 Strip block comments
54 Sum of first n cubes
54 Wireworld
54 XML/DOM serialization
53 Associative array/Merging
53 Dining philosophers
53 Find the intersection of two lines
53 First-class functions/Use numbers analogously O
53 Gaussian elimination
53 Heronian triangles
53 Move-to-front algorithm
53 Polynomial regression
53 Rate counter
53 Send email O O
53 Text processing/2
52 Chaos game
52 Colour bars/Display
52 Determinant and permanent
52 Determine if a string has all unique characters
52 Fractran
52 Hofstadter Figure-Figure sequences
52 Holidays related to Easter
52 Longest increasing subsequence
52 Make directory path
52 Naming conventions
52 Primality by Wilson's theorem
52 Remove vowels from a string
52 Water collected between towers
51 Bell numbers
51 Days between dates
51 Doubly-linked list/Element insertion
51 Doubly-linked list/Traversal
51 Egyptian division
51 Execute a Markov algorithm
51 Extensible prime generator
51 Farey sequence
51 Fusc sequence
51 GUI component interaction
51 Jaro similarity
51 Longest string challenge
51 Respond to an unknown method call O
51 Sum of divisors
51 Text processing/1
51 Zebra puzzle
50 Append a record to the end of a text file
50 Echo server
50 Kronecker product
50 Largest proper divisor of n
50 Metaprogramming O
50 Stable marriage problem
50 Taxicab numbers
49 Greyscale bars/Display
49 History variables O
49 Last letter-first letter
49 Tau number
49 Visualize a tree
48 Abbreviations, automatic
48 Active object
48 Bitmap/Flood fill
48 Determine if a string is squeezable
48 Determine if only one instance is running
48 Digital root/Multiplicative digital root
48 Element-wise operations
48 Elementary cellular automaton
48 Image noise
48 OpenGL
48 Polymorphic copy O
48 Polynomial long division
48 Recaman's sequence
48 Sparkline in unicode
48 Verify distribution uniformity/Naive
48 Words containing "the" substring
47 Average loop length
47 Bitmap/Read a PPM file
47 Doubly-linked list/Definition
47 Generate Chess960 starting position
47 Isqrt (integer square root) of X
47 Mertens function
47 Narcissist
47 Perfect totient numbers
47 Problem of Apollonius
47 Set consolidation
47 Text between
47 Ulam spiral (for primes)
46 Aliquot sequence classifications
46 Currency
46 Flipping bits game
46 Hilbert curve
46 Keyboard input/Flush the keyboard buffer
46 Loops/With multiple ranges
46 Parsing/Shunting-yard algorithm
46 Rosetta Code/Count examples
46 Send an unknown method call O
46 Sorting algorithms/Radix sort
46 Speech synthesis O
46 Spinning rod animation/Text
46 Start from a main routine O O O
46 Subtractive generator
46 Sum of the digits of n is substring of n
46 Sum to 100
46 Terminal control/Dimensions
45 Bulls and cows/Player
45 Carmichael 3 strong pseudoprimes
45 Chowla numbers
45 Deepcopy O
45 Fivenum
45 Musical scale
45 Secure temporary file
45 Sorting Algorithms/Circle Sort
45 The Name Game
45 Truth table
45 Twelve statements
45 UTF-8 encode and decode
45 Variable size/Set O O
44 ABC words
44 Atomic updates O
44 Bitmap/Midpoint circle algorithm
44 Brazilian numbers
44 GUI/Maximum window dimensions
44 Hickerson series of almost integers
44 MD5/Implementation
44 Percentage difference between images
44 Ranking methods
44 S-expressions
44 Sailors, coconuts and a monkey problem
44 Sort a list of object identifiers
44 Summarize and say sequence
43 Balanced ternary
43 Bioinformatics/base count
43 Casting out nines
43 Color of a screen pixel
43 Combinations and permutations
43 Coprimes
43 Cycle detection
43 Idiomatically determine all the lowercase and uppercase letters
43 Inverted index
43 Knapsack problem/Bounded
43 Numbers divisible by their individual digits, but not by the product of their digits.
43 Permutations by swapping
43 Permutations/Derangements
43 Read a file character by character/UTF8
43 Table creation/Postal addresses
43 Terminal control/Inverse video
43 Totient function
43 Voronoi diagram
42 21 game
42 Abbreviations, easy
42 Approximate equality
42 Base 16 numbers needing a to f
42 Calendar - for "REAL" programmers O O O O
42 Colour pinstripe/Display
42 Cramer's rule
42 Euler's identity
42 Humble numbers
42 Julia set
42 Largest number divisible by its digits
42 Loops/Wrong ranges
42 Magic squares of doubly even order
42 Parallel calculations
42 Pascal's triangle/Puzzle
42 Permutations with repetitions
42 Primorial numbers
42 Safe primes and unsafe primes
42 Substitution cipher
41 Convex hull
41 File extension is in extensions list
41 Find words which contains more than 3 e vowels
41 Four is magic
41 GUI enabling/disabling of controls
41 Long primes
41 MAC Vendor Lookup
41 Parametric polymorphism O O
41 Permutation test
41 Prime conspiracy
41 Ray-casting algorithm
41 Rosetta Code/Find bare lang tags
41 Scope/Function names and labels
41 Sequence: smallest number with exactly n divisors
41 Smallest square that begins with n
41 Sorting algorithms/Strand sort
41 Statistics/Normal distribution
41 Strange numbers
41 Terminal control/Hiding the cursor
41 Topswops
41 Variable-length quantity
40 Brace expansion
40 Create a file on magnetic tape O O
40 Cuban primes
40 Display a linear combination
40 Feigenbaum constant calculation
40 Find the intersection of a line with a plane
40 Input/Output for lines of text
40 Input/Output for pairs of numbers
40 Knuth's algorithm S
40 LU decomposition
40 Numbers which binary and ternary digit sum are prime
40 Palindrome dates
40 Pathological floating point problems
40 Penney's game
40 Pythagoras tree
40 Pythagorean quadruples
40 QR decomposition
40 Special Divisors
40 Test integerness
40 Vampire number
40 Yellowstone sequence
39 Bitwise IO
39 Check output device is a terminal
39 Cousin primes
39 Events
39 Factorions
39 Fibonacci word/fractal
39 Floyd-Warshall algorithm
39 Function prototype O O
39 Integer roots
39 Kahan summation
39 Lychrel numbers
39 Maze solving
39 Metered concurrency
39 Multiple regression
39 Order disjoint list items
39 Parsing/RPN to infix conversion
39 Sequence: smallest number greater than previous term with exactly n divisors
39 Sutherland-Hodgman polygon clipping
38 Abbreviations, simple
38 Break OO privacy O O
38 Cheryl's birthday
38 Church numerals
38 Constrained genericity O
38 Extra primes
38 Find palindromic numbers in both binary and ternary bases
38 Frobenius numbers
38 Halt and catch fire
38 Lah numbers
38 Metronome
38 Minesweeper game
38 Pinstripe/Display
38 Primes whose sum of digits is 25
38 Solve the no connection puzzle
38 Terminal control/Unicode output
38 Triplet of three numbers
37 Bitmap/Bézier curves/Cubic
37 Conjugate transpose
37 Determine if two triangles overlap
37 Find words which contains all the vowels
37 MD4
37 Multiline shebang
37 Mutex
37 Nice primes
37 Numerical integration/Gauss-Legendre Quadrature
37 Object serialization O
37 Ordered partitions
37 Pentagram
37 Product of divisors
37 RSA code
37 Square-free integers
37 Strong and weak primes
37 Subset sum problem
37 Unique characters
36 Apply a digital filter (direct form II transposed)
36 Arithmetic-geometric mean/Calculate Pi
36 Circular primes
36 Diversity prediction theorem
36 Egyptian fractions
36 Find prime numbers of the form n*n*n+2
36 Find words with alternating vowels and consonants
36 Gauss-Jordan matrix inversion
36 Minimum number of cells after, before, above and below NxN squares
36 Multi-dimensional array
36 Old Russian measure of length
36 Parametrized SQL statement O
36 RIPEMD-160
36 Sorting algorithms/Patience sort
35 Bacon cipher
35 Chaocipher
35 Continued fraction/Arithmetic/Construct from rational number
35 Decimal floating point number to binary
35 Dice game probabilities
35 Eban numbers
35 Entropy/Narcissist
35 Koch curve
35 Length of an arc between two angles
35 Longest common suffix
35 Mersenne primes
35 Partition an integer x into n primes
35 Pattern matching O
35 Reflection/List properties O
35 Sum of elements below main diagonal of matrix
35 Terminal control/Preserve screen
35 Textonyms
35 Zumkeller numbers
34 Bitmap/Histogram
34 Check input device is a terminal O O
34 Count how many vowels and consonants occur in a string
34 Create an object at a given address O O O O O O
34 Digit fifth powers
34 Find prime n such that reversed n is also prime
34 First power of 2 that has leading decimal digits of 12
34 Galton box animation
34 Modular arithmetic
34 Multiplicative order
34 Negative base numbers
34 Numbers with equal rises and falls
34 Numbers with prime digits whose sum is 13
34 Poker hand analyser
34 Set puzzle
34 Shift list elements to left by 3
34 Solve a Hidato puzzle
34 Sorting algorithms/Cycle sort
34 Straddling checkerboard
34 Strange plus numbers
34 Terminal control/Cursor movement
34 Topic variable O
34 Type detection
34 Use another language to call a function
34 Write to Windows event log O
34 Xiaolin Wu's line algorithm
34 Zhang-Suen thinning algorithm
33 Angles (geometric), normalization and conversion
33 Bin given limits
33 Bitcoin/address validation
33 Bitmap/Bézier curves/Quadratic
33 Burrows–Wheeler transform
33 Change e letters to i in words
33 Compiler/lexical analyzer
33 Executable library O
33 Faulhaber's triangle
33 Implicit type conversion
33 Long literals, with continuations
33 Mian-Chowla sequence
33 Minimum positive multiple in base 10 using only 0 and 1
33 Möbius function
33 Odd and square numbers
33 Parse command-line arguments
33 Pell's equation
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 Smarandache prime-digital sequence
33 Successive prime differences
33 URL parser
33 Unprimeable numbers
33 Word wheel
32 Alternade words
32 Chat server O
32 Chemical calculator
32 Death Star
32 Decision tables
32 Draw a rotating cube
32 Esthetic numbers
32 Execute SNUSP
32 FTP
32 Faulhaber's formula
32 Find first and last set bit of a long integer
32 Jacobi symbol
32 Keyboard macros O
32 Law of cosines - triples
32 Machine code O
32 Numeric error propagation
32 Parallel brute force
32 Peano curve
32 Polyspiral
32 Pragmatic directives
32 Primes with digits in nondecreasing order
32 Range consolidation
32 Rosetta Code/Fix code tags
32 Sexy primes
32 Strange unique prime triplets
32 Super-d numbers
32 Superellipse
32 Window creation/X11
32 Word break problem
31 Arena storage pool O
31 Chebyshev coefficients
31 Check Machin-like formulas
31 Checkpoint synchronization
31 Deconvolution/1D
31 Fairshare between two and more
31 Find words whose first and last three letters are equal
31 First class environments
31 HTTPS/Authenticated
31 Mayan numerals
31 Memory layout of a data structure O
31 Pierpont primes
31 State name puzzle
31 Stirling numbers of the first kind
31 Stirling numbers of the second kind
31 Stream merge
31 Sum and product puzzle
31 Twin primes
31 Update a configuration file
31 Verify distribution uniformity/Chi-squared test
31 Weird numbers
30 A* search algorithm
30 AVL tree
30 Calkin-Wilf sequence
30 Distinct power numbers
30 Fermat numbers
30 Find first missing positive
30 Generate random chess position
30 Go Fish
30 Increasing gaps between consecutive Niven numbers
30 Kronecker product based fractals
30 Magnanimous numbers
30 Nonoblock
30 Numbers in base-16 representation that cannot be written with decimal digits
30 Partition function P
30 Perlin noise
30 Sierpinski pentagon
30 Summarize primes
30 Sylvester's sequence
30 Table creation
29 Active Directory/Connect O
29 Common list elements
29 Common sorted list
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 Formal power series
29 Fraction reduction
29 Honeycombs
29 N-smooth numbers
29 Natural sorting
29 Plasma effect
29 Ramsey's theorem
29 Reflection/List methods O
29 Sorting algorithms/Cocktail sort with shifting bounds
29 Superpermutation minimisation
29 Teacup rim text
29 Thiele's interpolation formula
29 Video display modes O O
29 World Cup group stage
28 Bioinformatics/Sequence mutation
28 Birthday problem
28 Cipolla's algorithm
28 Color wheel
28 Cut a rectangle
28 De Bruijn sequences
28 Find if a point is within a triangle
28 Find largest left truncatable prime in a given base
28 Fixed length records
28 Hunt the Wumpus
28 Image convolution
28 Intersecting number wheels
28 Merge and aggregate datasets
28 Monads/Maybe monad
28 Motzkin numbers
28 Nautical bell
28 Palindromic gapful numbers
28 Paraffins
28 Safe addition
28 Same fringe
28 Shortest common supersequence
28 Solve a Holy Knight's tour
28 The ISAAC Cipher
28 Tonelli-Shanks algorithm
28 Welch's t-test
28 Wieferich primes
28 Words from neighbour ones
28 Yahoo! search interface
27 Abelian sandpile model
27 Almkvist-Giullera formula for pi
27 Audio alarm
27 Card shuffles
27 Day of the week of Christmas and New Year
27 Distributed programming
27 Function frequency
27 Idiomatically determine all the characters that can be used for symbols
27 Minimum numbers of three lists
27 Next highest int from digits
27 Numbers in base 10 that are palindromic in bases 2, 4, and 16
27 Numbers with same digit set in base 10 and base 16
27 Ramer-Douglas-Peucker line simplification
27 Random Latin squares
27 Self numbers
27 Sequence of primorial primes
27 Simulate input/Keyboard O
27 Snake and Ladder
27 Sort the letters of string in alphabetical order
27 UPC
26 10001th prime
26 Base58Check encoding
26 Changeable words
26 Coprime triplets
26 Doomsday rule
26 Elliptic curve arithmetic
26 Find squares n where n+1 is prime
26 Hough transform
26 K-means++ clustering
26 Kolakoski sequence
26 Linux CPU utilization
26 Lucky and even lucky numbers
26 Magic squares of singly even order
26 Make a backup file
26 Matrix chain multiplication
26 Maximum difference between adjacent elements of list
26 Odd words
26 Order by pair comparisons
26 Padovan sequence
26 Parse an IP Address
26 Permutations/Rank of a permutation
26 Piprimes
26 Pseudo-random numbers/PCG32
26 RCRPG
26 Sierpinski arrowhead curve
26 Sleeping Beauty problem
26 Total circles area
26 Unique characters in each string
25 Cistercian numerals
25 Compare length of two strings
25 Consecutive primes with ascending or descending differences
25 Deming's Funnel
25 Elementary cellular automaton/Random Number Generator
25 Largest five adjacent number
25 List rooted trees
25 Markov chain text generator
25 Mind boggling card trick
25 Neighbour primes
25 Percolation/Mean run density
25 Play recorded sounds
25 Playfair cipher
25 Pseudo-random numbers/Xorshift star
25 Reflection/Get source O
25 Reverse the gender of a string
25 Special neighbor primes
25 Sum of primes in odd positions is prime
25 Sunflower fractal
24 ASCII art diagram converter
24 Abelian sandpile model/Identity
24 Active Directory/Search for a user O
24 Addition chains
24 Assertions in design by contract
24 Bilinear interpolation
24 Commatizing numbers
24 Create an object/Native demonstration
24 Erdős-primes
24 Exponentiation with infix operators in (or operating on) the base
24 File size distribution
24 Find square difference
24 Find words which contain the most consonants
24 Generate random numbers without repeating a value
24 Harmonic series
24 Mastermind
24 Numeric separator syntax
24 Odd squarefree semiprimes
24 Orbital elements
24 Palindromic primes
24 Permuted multiples
24 Positive decimal integers with the digit 1 occurring exactly twice
24 Pseudo-random numbers/Middle-square method
24 Record sound O
24 SOAP
24 Sequence: nth number with exactly n divisors
24 Smallest power of 6 whose decimal expansion contains n
24 Sokoban
24 Solve a Hopido puzzle
24 Solve a Numbrix puzzle
24 Spelling of ordinal numbers
24 Ulam numbers
24 Untrusted environment
23 15 puzzle solver
23 Exactly three adjacent 3 in lists
23 Find duplicate files
23 Index finite lists of positive integers
23 Joystick position O
23 Levenshtein distance/Alignment
23 Main step of GOST 28147-89
23 Median filter
23 Monads/List monad
23 Nested templated data
23 Palindromic primes in base 16
23 Perceptron
23 Pig the dice game/Player
23 Polynomial synthetic division
23 Prime numbers which contain 123
23 Prime words
23 Rare numbers
23 Reverse the order of lines in a text file while preserving the contents of each line
23 Vogel's approximation method
22 Bitcoin/public point to address
22 Concatenate two primes is also prime
22 Data Encryption Standard
22 EKG sequence convergence
22 Eertree
22 Elementary cellular automaton/Infinite length
22 Kosaraju
22 Largest prime factor
22 Latin Squares in reduced form
22 Line circle intersection
22 Montgomery reduction
22 N-body problem
22 Names to numbers
22 Native shebang
22 Next special primes
22 Numbers whose count of divisors is prime
22 Prime triplets
22 Primes whose first and last number is 3
22 Print debugging statement
22 Pseudo-random numbers/Combined recursive generator MRG32k3a
22 Solve triangle solitare puzzle
22 Steady Squares
22 Sum data type
22 Vigenère cipher/Cryptanalysis
22 Wilson primes of order n
22 Zeckendorf arithmetic
21 Arithmetic coding/As a generalized change of radix
21 Find adjacent primes which differ by a square integer
21 Just in time processing on a character stream
21 K-d tree
21 Knuth's power tree
21 Metallic ratios
21 Padovan n-step number sequences
21 Pancake numbers
21 Practical numbers
21 Primes - allocate descendants to their ancestors
21 Primes which contain only one odd digit
21 Pseudo-random numbers/Splitmix64
21 Readline interface
21 Separate the house number from the street name
21 Sierpinski curve
21 Simulate input/Mouse O
21 Snake
21 Special factorials
21 Substring primes
21 Sum of square and cube digits of an integer are primes
21 The sieve of Sundaram
21 Transportation problem
21 Vibrating rectangles
21 Window management
20 Air mass
20 Canonicalize CIDR
20 Color quantization
20 Compiler/code generator
20 Cubic Special Primes
20 Cyclotomic polynomial
20 Draw pixel 2
20 Imaginary base numbers
20 Longest substrings without repeating characters
20 Monads/Writer monad
20 Most frequent k chars distance
20 Nonogram solver
20 P-value correction
20 Percolation/Mean cluster density
20 Percolation/Site percolation
20 Quadrat Special Primes
20 SQL-based authentication
20 Selective file copy
20 Special pythagorean triplet
20 Summation of primes
20 Terminal control/Positional read O
20 Word search
19 Append numbers at same position in strings
19 Biorhythms
19 Bitmap/Read an image through a pipe
19 Code segment unload O
19 Compare sorting algorithms' performance
19 Compiler/virtual machine interpreter
19 Cyclops numbers
19 Find URI in text
19 Getting the number of decimals
19 HTTPS/Client-authenticated
19 Jaro-Winkler distance
19 Juggler sequence
19 Largest difference between adjacent primes
19 Last list item
19 Matrix digital rain
19 Nimber arithmetic
19 Peaceful chess queen armies
19 Permutations with some identical elements
19 Print itself
19 Smallest multiple
19 Square root by hand
19 Tarjan
19 Word ladder
18 Banker's algorithm
18 Bitmap/PPM conversion through a pipe
18 Compiler/syntax analyzer
18 Free polyominoes enumeration
18 Largest product in a grid
18 Logistic curve fitting in epidemiology
18 Minimum primes
18 NYSIIS
18 Own digits power sum
18 Particle swarm optimization
18 Percolation/Bond percolation
18 Proof O O O
18 Ramanujan's constant
18 Rendezvous O O
18 Retrieve and search chat history
18 SHA-256 Merkle tree
18 Self-hosting compiler
18 Sierpinski square curve
18 Singly-linked list/Element removal
18 Smallest numbers
18 Suffix tree
18 Two bullet roulette
18 XML validation
17 Aspect oriented programming
17 Bioinformatics/Subsequence
17 Canny edge detector
17 Chernick's Carmichael numbers
17 Four is the number of letters in the ...
17 Geometric algebra
17 Largest palindrome product
17 Legendre prime counting function
17 Longest palindromic substrings
17 Minimal steps down to 1
17 Modified random distribution
17 Numerical integration/Adaptive Simpson's method
17 Prime numbers p which sum of prime numbers less or equal to p is prime
17 Safe mode
16 Collect and sort square numbers in ascending order from three lists
16 Compiler/AST interpreter
16 Fortunate numbers
16 OpenWebNet password
16 Run as a daemon or service
16 Safe and Sophie Germain primes
16 Sine wave
16 Topological sort/Extracted top item
16 Useless instructions
15 Continued fraction/Arithmetic/G(matrix ng, continued fraction n)
15 Distribution of 0 Digits in factorial series
15 Factorial base numbers indexing permutations of a collection
15 Functional coverage tree
15 Gradient descent
15 Interactive help
15 Multi-base primes
15 Non-transitive dice
15 Pandigital prime
15 Pisano period
15 Rodrigues’ rotation formula
15 Untouchable numbers
15 XXXX redacted
14 Audio frequency generator
14 Checksumcolor
14 Deconvolution/2D+
14 Determine sentence type
14 Generalised floating point addition
14 Geohash
14 Long stairs
14 Minkowski question-mark function
14 Penrose tiling
14 Pseudorandom number generator image
14 Sorting algorithms/Tree sort on a linked list
14 Text completion
14 Three word location
14 Tree from nesting levels
14 Unit testing
14 VList
13 Curve that touches three points
13 Display an outline as a nested table
13 Execute CopyPasta Language
13 Graph colouring
13 Greed
13 Hourglass puzzle
13 Launch rocket with countdown and acceleration in stdout
13 One-time pad
13 Overloaded operators
13 Pentomino tiling
13 Quoting constructs
13 Railway circuit
13 Simulated annealing
13 Time-based one-time password algorithm
13 Tropical algebra overloading
13 Using a speech engine to highlight words
12 Catmull–Clark subdivision surface
12 Code Golf: Code Golf
12 Combinations with repetitions/Square digit chain
12 Conjugate a Latin verb
12 Distinct Palindromes within decimal numbers
12 External sort
12 Faces from a mesh
12 Fibonacci matrix-exponentiation
12 First 9 Prime Fibonacci Number
12 French Republican calendar
12 Hex words
12 Morpion solitaire
12 Range modifications
12 Rosetta Code/Rank languages by number of users
12 Rosetta Code/Tasks without examples
12 Spoof game
12 Suffixation of decimal numbers
12 Tetris
12 Tree datastructures
12 Verhoeff algorithm
11 Bioinformatics/Global alignment
11 Brace expansion using ranges
11 Camel case and snake case
11 Colour pinstripe/Printer
11 Count the coins/0-1
11 Earliest difference between prime gaps
11 Euclid-Mullin sequence
11 Euler's constant 0.5772...
11 Home primes
11 Magic constant
11 Numerical and alphabetical suffixes
11 Pinstripe/Printer
11 Polynomial derivative
11 Powerful numbers
11 Resistance calculator
11 Square form factorization
11 Starting a web browser
11 War card game
10 16 puzzle game
10 ADFGVX cipher
10 Discrete Fourier transform
10 Elliptic Curve Digital Signature Algorithm
10 Find Chess960 starting position identifier
10 IPC via named pipe O
10 Jaccard index
10 Mayan calendar
10 OpenGL/Utah Teapot
10 Parse EBNF
10 Ramanujan primes
10 Resistance network calculator
10 Simple turtle graphics
10 Solve equations with substitution method
10 Sort an outline at every level
10 Sort primes from list to a list
10 Sum of two adjacent numbers are primes
10 Text to HTML
10 URL shortener
10 User defined pipe and redirection operators
9 Compiler/Verifying syntax
9 Continued fraction/Arithmetic/G(matrix ng, continued fraction n1, continued fraction n2)
9 Cullen and Woodall numbers
9 Doubly-linked list/Element removal
9 Fibonacci heap
9 Integer long division
9 Minimum multiple of m where digital sum equals m
9 Multidimensional Newton-Raphson method
9 Price list behind API
9 Robots
9 Round-robin tournament schedule
9 Set right-adjacent bits
9 Smallest enclosing circle problem
9 Terminal control/Restricted width positional input/No wrapping
9 Terminal control/Restricted width positional input/With wrapping
9 Wordiff
8 Addition-chain exponentiation
8 Audio overlap loop
8 Dating agency
8 Hexapawn
8 OpenGL pixel shader
8 P-Adic numbers, basic
8 Ramanujan primes/twins
8 Random sentence from book
8 Raster bars
8 Recursive descent parser generator
8 Rosetta Code/Run examples
8 Tamagotchi emulator
8 WiktionaryDumps to words
7 Black Box
7 Boids
7 Chess player
7 Composite numbers k with no single digit factors whose factors are all substrings of k
7 Horse racing
7 I'm a software engineer, get me out of here
7 Latin Squares in reduced form/Randomizing using Jacobson and Matthews’ Technique
7 Numbers which are not the sum of distinct squares
7 Peripheral drift illusion
7 Process SMIL directives in XML data
7 Remote agent/Agent logic
7 Remote agent/Simulation
7 Strassen's algorithm
7 Ultra useful primes
7 Waveform analysis/Doh ray me
6 B-spline
6 Compiler/Simple file inclusion pre processor
6 Create your own text control codes
6 P-Adic square roots
6 Particle fountain
6 Remote agent/Agent interface
6 Segmentation fault protection
6 Solve a Rubik's Cube
5 Divide a rectangle into a number of unequal triangles
5 Dominoes
5 Generalised floating point multiplication
5 Multiton
5 Number triplets game
5 OLE automation O O O O
5 Rosetta Code/List authors of task descriptions
5 Ruth-Aaron numbers
5 Smallest number k such that k+2^m is composite for all m less than k
5 Solving coin problems
5 Unicode polynomial equation
5 Using the Meetup.com API
5 Waveform analysis/Top and tail
5 Weather routing
4 15 puzzle game in 3D
4 Blackjack strategy
4 CLI-based maze-game
4 Erdős–Woods numbers
4 Ukkonen’s suffix tree construction
4 Vidir
3 Diophantine linear system solving
3 Elevator simulation
3 IRC gateway O
3 Sanitize user input
3 Uno (Card Game)
2 Repunit primes
2 Worthwhile task shaving