Rosetta Code/Count examples/Full list/Tier 4

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Revision as of 21:06, 7 May 2023 by Thundergnat (talk | contribs) (Update full list output)

Fourth 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
Fourth ten programming languages by number of task examples completed:
    ㉛ Rust          ㉜ Lua           ㉝ PicoLisp      ㉞ F_Sharp       ㉟ AutoHotkey   
    ㊱ Ring          ㊲ Delphi        ㊳ JavaScript    ㊴ XPL0          ㊵ Arturo       
As of 2023-05-07T21:04:46Z :: Tasks: 1214 :: Draft Tasks:405 :: Total Tasks: 1619 :: Total Examples: 91267
Count Task
564 Hello world/Text
370 99 bottles of beer
364 FizzBuzz
348 100 doors
302 Comments
295 Fibonacci sequence
293 Factorial
291 A+B
287 Empty program
251 Loops/Infinite
245 Reverse a string
240 Ackermann function
240 Arrays
238 Function definition
233 Loops/For
225 Conditional structures
225 Loops/While
215 Array concatenation
213 Greatest element of a list
212 Arithmetic/Integer
201 Even or odd
201 Repeat a string
200 Increment a numerical string
198 Greatest common divisor
197 Sieve of Eratosthenes
196 Averages/Arithmetic mean
192 Array length
192 Hello world/Graphical
190 Copy a string
190 String concatenation
188 Binary digits
187 Sum and product of an array
187 Towers of Hanoi
186 Boolean values
186 Integer comparison
185 Loops/Downward for
183 Hello world/Newline omission
182 Apply a callback to an array
182 Character codes
182 Integer sequence
180 Rot-13
179 String length
177 Palindrome detection
177 String case
177 Tokenize a string
176 Empty string
176 Loops/For with a specified step
175 Sum of a series
174 Loops/Foreach
173 Loops/Break
173 Quine
170 Dot product
169 Logical operations
167 Filter
167 Loops/Do-while
165 Sum of squares
164 Hailstone sequence
162 Generic swap
161 Associative array/Creation
160 Loops/N plus one half
160 Remove duplicate elements
158 Sorting algorithms/Quicksort
157 Leap year
157 Sort an integer array
155 Caesar cipher
155 Execute a system command
155 Luhn test of credit card numbers
154 Generate lower case ASCII alphabet
154 System time
153 Command-line arguments
152 Stack
151 Higher-order functions
151 Zero to the zero power
150 Determine if a string is numeric
150 User input/Text
149 Factors of an integer
149 Guess the number
149 Hello world/Standard error
148 Substring
147 Sorting algorithms/Bubble sort
146 ABC problem
146 Bitwise operations
146 Create a file
146 Loops/Continue
146 Read entire file
145 Check that file exists
145 Loop over multiple arrays simultaneously
145 Primality by trial division
144 Mutual recursion
143 Least common multiple
143 Roman numerals/Encode
143 Sleep
141 Balanced brackets
141 Count in octal
140 Ethiopian multiplication
139 File input/output
139 Happy numbers
139 Literals/String
139 Program termination
138 Day of the week
138 Variables
137 Date format
137 Mandelbrot set
136 Pascal's triangle
134 Compound data type
134 Literals/Integer
133 Count occurrences of a substring
133 Function composition
133 Include a file O
133 Knuth shuffle
132 Sorting algorithms/Insertion sort
130 Detect division by zero
130 Loops/Nested
130 N-queens problem
130 Null object
130 Real constants and functions
130 String matching
129 Matrix transposition
128 Averages/Root mean square
128 Pick random element
128 Read a file line by line
128 Return multiple values
127 Case-sensitivity of identifiers
127 File size
127 Guess the number/With feedback
126 Align columns
126 Associative array/Iteration
126 Babbage problem
126 Delete a file
126 Letter frequency
126 Strip a set of characters from a string
125 Anagrams
125 Look-and-say sequence
124 Averages/Median
124 Binary search
124 Conway's Game of Life
124 Matrix multiplication
124 Perfect numbers
123 Flatten a list
123 Hash from two arrays
123 Identity matrix
123 Input loop
123 Permutations
121 Environment variables
121 Haversine formula
120 Call a function
120 Classes
120 Roman numerals/Decode
120 String interpolation (included)
119 Assertions
119 Find limit of recursion
119 Sierpinski triangle
119 String append
119 Substring/Top and tail
118 Rename a file
117 Arithmetic/Complex
117 Harshad or Niven series
117 Temperature conversion
116 HTTP
116 Horner's rule for polynomial evaluation
116 Pangram checker
116 Variadic function
115 Arithmetic-geometric mean
115 Bulls and cows
115 Hostname
115 Infinity
115 Multiplication tables
114 Comma quibbling
114 Evaluate binomial coefficients
114 Levenshtein distance
114 N'th
114 Search a list
113 Anonymous recursion
113 Formatted numeric output
113 Reverse words in a string
113 Run-length encoding
113 Strip whitespace from a string/Top and tail
112 Accumulator factory
112 Averages/Pythagorean means
112 Program name
112 Sum multiples of 3 and 5
112 The Twelve Days of Christmas
111 Calculating the value of e
111 Catalan numbers
111 Ordered words
111 Zig-zag matrix
110 Middle three digits
110 Queue/Definition
110 Sorting algorithms/Merge sort
110 String prepend
110 Sum digits of an integer
109 Combinations
109 Create a two-dimensional array at runtime
109 Digital root
109 Exceptions
109 Sequence of non-squares
109 Trigonometric functions
108 Random numbers
108 Vector products
107 Arbitrary-precision integers (included) O
107 Shell one-liner O
105 Enumerations
105 Prime decomposition
105 Regular expressions
105 Short-circuit evaluation
105 Sorting algorithms/Selection sort
104 24 game
104 Amicable pairs
104 Power set
103 Evolutionary algorithm
103 Time a function
103 Walk a directory/Non-recursively
102 Abundant, deficient and perfect number classifications
102 Collections
102 Execute Brain****
102 Gray code
101 Averages/Mode
101 Hello world/Newbie
101 Map range
101 Sorting algorithms/Gnome sort
100 Create an HTML table
100 Interactive programming (repl) O O
100 Tree traversal
99 Hamming numbers
99 Hofstadter Q sequence
99 One-dimensional cellular automata
99 Range expansion
99 Sort using a custom comparator
99 Y combinator
98 Exponentiation operator
98 MD5
98 Nth root
98 Show ASCII table
98 Symmetric difference
97 First-class functions
97 Langton's ant
97 Random number generator (included)
97 Sorting algorithms/Cocktail sort
97 Sorting algorithms/Heapsort
97 String comparison
96 Address of a variable O
96 Entropy
96 Modular inverse
96 Monty Hall problem
96 Number reversal game
95 Catamorphism
95 Forward difference
95 Range extraction
95 Terminal control/Clear the screen
94 Inheritance/Single
94 JSON
94 Josephus problem
94 Number names
94 Sierpinski carpet
93 Averages/Simple moving average
93 CSV data manipulation
93 Menu
93 Sorting algorithms/Bogosort
92 Abstract type O
92 Compare a list of strings
92 Cumulative standard deviation
92 Five weekends
92 Floyd's triangle
92 Last Friday of each month
92 Repeat
92 Simple windowed application
92 Split a character string based on change of character
91 Greatest subsequential sum
91 Literals/Floating point
91 Non-decimal radices/Convert
91 Set
90 Hello world/Line printer
90 URL decoding
89 Anti-primes
89 Box the compass
89 CSV to HTML translation
89 Count in factors
89 Playing cards
89 Queue/Usage
89 Sort an array of composite structures
89 Window creation
88 Munchausen numbers
88 Order two numerical lists
88 Population count
88 SEDOLs
88 Strip comments from a string
88 Walk a directory/Recursively
87 Almost prime
87 Find the last Sunday of each month
87 Here document O
87 Operator precedence
87 Price fraction
87 Proper divisors
87 Top rank per group
86 Bitmap
86 Department numbers
86 Multifactorial
86 Read a specific line from a file
86 Singly-linked list/Traversal
86 URL encoding
86 Word wrap
85 Closures/Value capture
85 Extend your language
85 File modification time
85 Find common directory path
85 Jump anywhere O
85 Knapsack problem/0-1
85 Sorting algorithms/Shell sort
84 CRC-32
84 Count the coins
84 Find the missing permutation
84 Jensen's Device
84 Lucas-Lehmer test
84 Monte Carlo methods
84 Priority queue
84 Pythagorean triples
84 Terminal control/Ringing the terminal bell
84 Thue-Morse
83 15 puzzle game
83 Dragon curve
83 Dynamic variable names O
83 Introspection
83 Kaprekar numbers
83 Sockets
83 Spiral matrix
82 100 prisoners
82 Concurrent computing
82 Fibonacci n-step number sequences
82 Keyboard input/Obtain a Y or N response
82 Long multiplication
82 Man or boy test
82 Pernicious numbers
82 Pi
82 Show the epoch O
82 Sorting algorithms/Counting sort
82 Take notes on the command line
82 XML/Input
81 Angle difference between two bearings
81 Animation
81 Call a foreign-language function
81 Call an object method
81 Empty directory
81 Gamma function
81 Linear congruential generator
81 Magic squares of odd order
81 Old lady swallowed a fly
81 Sorting algorithms/Comb sort
81 Soundex
81 Special characters
81 Web scraping
80 Anagrams/Deranged anagrams
80 Equilibrium index
80 Quaternion type
80 Rock-paper-scissors
80 Semordnilap
80 Sequence of primes by trial division
80 Singly-linked list/Element definition
79 Additive primes
79 Convert seconds to compound duration
79 Currying
79 Date manipulation
79 Flow-control structures
79 Guess the number/With feedback (player)
79 Hello world/Web server
79 Non-decimal radices/Output
79 Phrase reversals
79 SHA-1
79 Sudoku
79 Unicode variable names
79 Write entire file
78 Averages/Mean angle
78 Benford's law
78 Calendar
78 Execute HQ9+
78 List comprehensions
78 Read a configuration file
78 Rep-string
78 Sort disjoint sublist
77 AKS test for primes
77 Enforced immutability
77 Unix/ls
77 Vigenère cipher
76 Chinese remainder theorem
76 Combinations with repetitions
76 Damm algorithm
76 Draw a sphere
76 Exponentiation order
76 Four bit adder
76 Fractal tree
76 Write float arrays to a text file
75 Attractive numbers
75 Bitmap/Bresenham's line algorithm
75 Euler method
75 Exceptions/Catch an exception thrown in a nested call
75 I before E except after C
75 Jewels and stones
75 Multiple distinct objects
75 Roots of unity
75 SHA-256
75 Sort three variables
75 Special variables
75 Stern-Brocot sequence
75 Van der Corput sequence
74 Catalan numbers/Pascal's triangle
74 General FizzBuzz
74 Largest int from concatenated ints
74 Nested function
74 Sorting algorithms/Stooge sort
74 Square but not cube
74 Stair-climbing puzzle
73 Constrained random points on a circle
73 ISBN13 check digit
73 Longest common subsequence
73 Maze generation
73 Parsing/RPN calculator algorithm
73 Polymorphism
73 Runtime evaluation
73 Van Eck sequence
72 Arithmetic/Rational
72 Barnsley fern
72 Fast Fourier transform
72 Fork O
72 IBAN
72 Modular exponentiation
72 Named parameters O
72 Numerical integration
72 Probabilistic choice
72 Sorting algorithms/Pancake sort
72 Strip control codes and extended characters from a string
72 Text processing/Max licenses in use
72 Trabb Pardo–Knuth algorithm
72 Variable size/Get O
72 Yin and yang
72 Zeckendorf number representation
71 Amb
71 Compile-time calculation O O
71 Continued fraction
71 Determine if a string is collapsible
71 Euler's sum of powers conjecture
71 Gapful numbers
71 Get system command output
71 Narcissistic decimal number
71 Self-describing numbers
71 Semiprime
71 Word frequency
70 4-rings or 4-squares puzzle
70 Closest-pair problem
70 Dutch national flag problem
70 Host introspection O
70 Isqrt (integer square root) of X
70 Memory allocation O
70 Morse code
70 One of n lines in a file
70 Remove lines from a file
70 Roots of a function
70 Singly-linked list/Element insertion
70 Sort stability
69 Abundant odd numbers
69 Binary strings
69 Circles of given radius through two points
69 Extract file extension
69 RPG attributes generator
69 Write language name in 3D ASCII
68 Best shuffle
68 Chinese zodiac
68 Cholesky decomposition
68 Documentation
68 Leonardo numbers
68 Non-decimal radices/Input
68 Sorting algorithms/Sleep sort
68 Subleq
68 Tau function
68 XML/Output
67 9 billion names of God the integer
67 Animate a pendulum
67 Base64 decode data
67 CUSIP
67 Emirp primes
67 Factors of a Mersenne number
67 Integer overflow
67 Magic 8-ball
67 McNuggets problem
67 Mouse position
67 Optional parameters
67 Plot coordinate pairs
67 Reduced row echelon form
67 Runge-Kutta method
67 Two identical strings
67 Two sum
67 Undefined values
66 Cartesian product of two or more lists
66 Globally replace text in several files
66 HTTPS
66 Hofstadter-Conway $10,000 sequence
66 Inheritance/Multiple O
66 Knight's tour
66 Terminal control/Display an extended character
66 Vector
65 Averages/Mean time of day
65 Bitmap/Write a PPM file
65 Determine if a string has all the same characters
65 Draw a clock
65 Draw a cuboid
65 Draw a pixel
65 Long year
65 Longest common prefix
65 Ludic numbers
65 Quickselect algorithm
65 Remove vowels from a string
65 Roots of a quadratic function
65 Smith numbers
65 Ternary logic
65 Test a function
65 Tic-tac-toe
64 Arithmetic evaluation
64 Base64 encode data
64 Cantor set
64 Copy stdin to stdout
64 DNS query
64 Generator/Exponential
64 JortSort
64 Knapsack problem/Continuous
64 Miller–Rabin primality test
64 Pascal matrix generation
64 Unicode strings
63 2048
63 24 game/Solve
63 Disarium numbers
63 Horizontal sundial calculations
63 Huffman coding
63 Knapsack problem/Unbounded
63 Maximum triangle path sum
62 Discordian date
62 Farey sequence
62 Kernighans large earthquake problem
62 Longest common substring
62 Mad Libs
62 Partial function application
62 Primality by Wilson's theorem
62 Sattolo cycle
62 Truncatable primes
61 Add a variable to a class instance at runtime O O O
61 Brownian tree
61 Define a primitive data type
61 Doubly-linked list/Element definition
61 FASTA format
61 Fusc sequence
61 Grayscale image
61 Left factorials
61 Matrix-exponentiation operator
61 Nim game
61 Random number generator (device)
61 Scope modifiers
61 Sorting algorithms/Bead sort
61 Topological sort
61 Truncate a file
61 User input/Graphical
60 Dinesman's multiple-dwelling problem
60 Fibonacci word
60 Hash join
60 Iterated digits squaring
60 Keyboard input/Keypress check
60 LZW compression
60 Largest proper divisor of n
60 Multisplit
60 Odd word problem
60 Pointers and references O
60 Stem-and-leaf plot
60 Tau number
60 Terminal control/Coloured text
60 Unbias a random generator
59 Bernoulli numbers
59 Call a function in a shared library
59 Convert decimal number to rational
59 Deal cards for FreeCell
59 Dijkstra's algorithm
59 Loops/With multiple ranges
59 Runtime evaluation/In an environment
59 Singleton
59 Sum of divisors
59 Sum of first n cubes
59 Tokenize a string with escaping
59 Universal Turing machine
59 Words containing "the" substring
58 Archimedean spiral
58 Associative array/Merging
58 Delegates
58 Find the intersection of two lines
58 Forest fire
58 Loops/Increment loop index within loop body
58 Modulinos
58 Perfect shuffle
58 Sorting algorithms/Permutation sort
58 Stack traces
57 Abbreviations, automatic
57 Chaos game
57 Determine if a string has all unique characters
57 Extreme floating point values
57 First-class functions/Use numbers analogously
57 Handle a signal
57 Holidays related to Easter
57 Inverted syntax O O O
57 Password generator
57 Rosetta Code/Rank languages by popularity
57 XML/XPath
56 Code Golf: Code Golf
56 Compare length of two strings
56 Days between dates
56 Greyscale bars/Display
56 Naming conventions
56 Non-continuous subsequences
56 Perfect totient numbers
56 Pig the dice game
56 Rate counter
56 Search a list of records
56 Seven-sided dice from five-sided dice
56 Shoelace formula for polygonal area
56 Sort numbers lexicographically
56 Validate International Securities Identification Number
55 Egyptian division
55 Heronian triangles
55 Longest increasing subsequence
55 Move-to-front algorithm
55 Recaman's sequence
55 Send email O
55 Strip block comments
55 Synchronous concurrency
55 Terminal control/Cursor positioning
55 XML/DOM serialization
54 Bell numbers
54 Doubly-linked list/Element insertion
54 Extensible prime generator
54 Halt and catch fire
54 Hofstadter Figure-Figure sequences
54 Jaro similarity
54 Kronecker product
54 Polynomial regression
54 Statistics/Basic
54 Strange plus numbers
54 Text processing/2
54 Water collected between towers
54 Wireworld
54 Zebra puzzle
53 Average loop length
53 Determine if a string is squeezable
53 Dining philosophers
53 Doubly-linked list/Traversal
53 Fractran
53 Gaussian elimination
53 Longest string challenge
53 Make directory path
53 Sierpinski triangle/Graphical
53 Smallest square that begins with n
53 Spinning rod animation/Text
53 The Name Game
53 Totient function
52 Bioinformatics/base count
52 Convex hull
52 Determinant and permanent
52 Digital root/Multiplicative digital root
52 Elementary cellular automaton
52 Execute a Markov algorithm
52 GUI component interaction
52 Generate Chess960 starting position
52 Mertens function
52 Metaprogramming O
52 Munching squares
52 Stable marriage problem
52 Text processing/1
51 Aliquot sequence classifications
51 Append a record to the end of a text file
51 Doubly-linked list/Definition
51 Musical scale
51 Numbers divisible by their individual digits, but not by the product of their digits.
51 Respond to an unknown method call O O
51 Sum of the digits of n is substring of n
51 Taxicab numbers
51 Text between
51 Ulam spiral (for primes)
50 21 game
50 ABC words
50 Bitmap/Flood fill
50 Chowla numbers
50 Colour bars/Display
50 Echo server
50 Floyd-Warshall algorithm
50 Hilbert curve
50 History variables
50 Image noise
50 Last letter-first letter
50 MAC vendor lookup
50 Odd and square numbers
50 Polymorphic copy
50 Polynomial long division
50 Send an unknown method call O
50 Sparkline in unicode
50 Visualize a tree
49 Abbreviations, easy
49 Approximate equality
49 Element-wise operations
49 Idiomatically determine all the lowercase and uppercase letters
49 OpenGL
49 Set consolidation
49 Sorting algorithms/Radix sort
49 Start from a main routine O O
49 UTF-8 encode and decode
49 Verify distribution uniformity/Naive
48 Active object
48 Bitmap/Midpoint circle algorithm
48 Bitmap/Read a PPM file
48 Casting out nines
48 Colour pinstripe/Display
48 Determine if only one instance is running
48 GUI/Maximum window dimensions
48 Narcissist
48 Problem of Apollonius
48 Sorting Algorithms/Circle Sort
48 Strange numbers
48 Substitution cipher
48 Twelve statements
48 Variable size/Set O
47 Color of a screen pixel
47 Continued fraction/Arithmetic/Construct from rational number
47 Currency
47 Deepcopy
47 Factorions
47 Feigenbaum constant calculation
47 Find words which contains more than 3 e vowels
47 Fivenum
47 Knapsack problem/Bounded
47 Matrix with two diagonals
47 Parsing/Shunting-yard algorithm
47 Permutations/Derangements
47 Speech synthesis
47 Sum to 100
47 Terminal control/Dimensions
47 Type detection
46 Abbreviations, simple
46 Brazilian numbers
46 Bulls and cows/Player
46 Compiler/lexical analyzer
46 Count how many vowels and consonants occur in a string
46 File extension is in extensions list
46 Find square difference
46 Flipping bits game
46 Humble numbers
46 Keyboard input/Flush the keyboard buffer
46 Loops/Wrong ranges
46 Nice primes
46 Palindrome dates
46 Pascal's triangle/Puzzle
46 Permutations by swapping
46 Rosetta Code/Count examples
46 Secure temporary file
46 Shift list elements to left by 3
46 Sort a list of object identifiers
46 Sorting algorithms/Patience sort
46 Special divisors
46 Subtractive generator
46 Sutherland-Hodgman polygon clipping
46 Truth table
45 Atomic updates O
45 Base 16 numbers needing a to f
45 Coprimes
45 Digit fifth powers
45 Display a linear combination
45 Extra primes
45 Input/Output for pairs of numbers
45 Lah numbers
45 MD5/Implementation
45 Primorial numbers
45 Product of divisors
45 Ranking methods
45 Read a file character by character/UTF8
45 S-expressions
45 Sailors, coconuts and a monkey problem
45 Terminal control/Hiding the cursor
45 Variable-length quantity
45 Yellowstone sequence
44 Balanced ternary
44 Brace expansion
44 Carmichael 3 strong pseudoprimes
44 Combinations and permutations
44 Cramer's rule
44 Cycle detection
44 Euler's identity
44 Find prime numbers of the form n*n*n+2
44 Hickerson series of almost integers
44 Input/Output for lines of text
44 Julia set
44 Largest number divisible by its digits
44 Long primes
44 Mersenne primes
44 Percentage difference between images
44 Pythagorean quadruples
44 Safe primes and unsafe primes
44 Sequence: smallest number with exactly n divisors
44 Summarize and say sequence
44 Terminal control/Inverse video
44 Voronoi diagram
43 Find prime n such that reversed n is also prime
43 Find the intersection of a line with a plane
43 Find words which contains all the vowels
43 Four is magic
43 Frobenius numbers
43 GUI enabling/disabling of controls
43 Inverted index
43 Kahan summation
43 Modular arithmetic
43 Permutations with repetitions
43 Prime conspiracy
43 Table creation/Postal addresses
43 Triplet of three numbers
43 Unique characters
42 10001th prime
42 Arithmetic-geometric mean/Calculate Pi
42 Ascending primes
42 Calendar - for "REAL" programmers
42 Cheryl's birthday
42 Fibonacci word/fractal
42 Find words whose first and last three letters are equal
42 Function prototype O O
42 Implicit type conversion
42 Integer roots
42 Knuth's algorithm S
42 Magic squares of doubly even order
42 Multiple regression
42 Parallel calculations O
42 Pathological floating point problems
42 Penney's game
42 Pseudo-random numbers/Middle-square method
42 Rosetta Code/Find bare lang tags
42 Scope/Function names and labels
42 Statistics/Normal distribution
42 Topswops
41 Bitwise IO
41 Cousin primes
41 Create a file on magnetic tape
41 Cuban primes
41 Fairshare between two and more
41 Find palindromic numbers in both binary and ternary bases
41 Koch curve
41 Maze solving
41 Metered concurrency
41 Numbers with prime digits whose sum is 13
41 Parametric polymorphism O
41 Permutation test
41 Primes whose sum of digits is 25
41 QR decomposition
41 Ray-casting algorithm
41 Sorting algorithms/Strand sort
41 Sudan function
41 Test integerness
41 Vampire number
41 Xiaolin Wu's line algorithm
40 Alternade words
40 Break OO privacy O
40 Church numerals
40 Dice game probabilities
40 Find words with alternating vowels and consonants
40 LU decomposition
40 Longest common suffix
40 Lychrel numbers
40 Minimum number of cells after, before, above and below NxN squares
40 Multi-dimensional array O
40 Numbers in base-16 representation that cannot be written with decimal digits
40 Numbers whose binary and ternary digit sums are prime
40 Old Russian measure of length
40 Parsing/RPN to infix conversion
40 Pinstripe/Display
40 Pythagoras tree
40 Sequence: smallest number greater than previous term with exactly n divisors
40 Solve the no connection puzzle
39 Apply a digital filter (direct form II transposed)
39 Bitmap/Bézier curves/Cubic
39 Check output device is a terminal
39 Constrained genericity O O
39 Diversity prediction theorem
39 Draw a rotating cube
39 Entropy/Narcissist
39 Events
39 Length of an arc between two angles
39 Machine code
39 Metronome
39 Minesweeper game
39 Mutex
39 Numerical integration/Gauss-Legendre Quadrature
39 Order disjoint list items
39 RSA code
39 Show the (decimal) value of a number of 1s appended with a 3, then squared
39 Sort the letters of string in alphabetical order
39 Square-free integers
39 Sum of elements below main diagonal of matrix
39 Terminal control/Unicode output
38 Algebraic data types
38 Change e letters to i in words
38 Circular primes
38 Conjugate transpose
38 Create an object at a given address O
38 Determine if two triangles overlap
38 Eban numbers
38 First power of 2 that has leading decimal digits of 12
38 Multiline shebang
38 Negative base numbers
38 Numbers with equal rises and falls
38 Object serialization
38 Pentagram
38 Smarandache prime-digital sequence
38 Strange unique prime triplets
38 Strong and weak primes
38 Subset sum problem
38 Successive prime differences
38 Word wheel
38 Zumkeller numbers
37 AVL tree
37 Chaocipher
37 Find first and last set bit of a long integer
37 First 9 prime Fibonacci number
37 Greedy algorithm for Egyptian fractions
37 MD4
37 Magnanimous numbers
37 Maximum difference between adjacent elements of list
37 Möbius function
37 Numbers with same digit set in base 10 and base 16
37 Ordered partitions
37 Pell's equation
37 Polyspiral
37 RIPEMD-160
37 Steady squares
37 Superellipse
37 Textonyms
36 Bacon cipher
36 Bitmap/Bézier curves/Quadratic
36 Decimal floating point number to binary
36 Esthetic numbers
36 Faulhaber's triangle
36 Find first missing positive
36 Find words which contain the most consonants
36 Galton box animation
36 Gauss-Jordan matrix inversion
36 Harmonic series
36 Motzkin numbers
36 Parse command-line arguments
36 Partition function P
36 Perlin noise
36 Poker hand analyser
36 Sexy primes
36 Terminal control/Cursor movement
36 Terminal control/Preserve screen
36 Twin primes
36 URL parser
35 Angles (geometric), normalization and conversion
35 Burrows–Wheeler transform
35 Calkin-Wilf sequence
35 Canonicalize CIDR
35 Color wheel
35 Death Star
35 FTP
35 Find if a point is within a triangle
35 Minimum numbers of three lists
35 Minimum positive multiple in base 10 using only 0 and 1
35 Parameterized SQL statement
35 Partition an integer x into n primes
35 Peano curve
35 Positive decimal integers with the digit 1 occurring exactly twice
35 Reflection/List properties O
35 Resistor mesh
35 Rosetta Code/Find unimplemented tasks
35 Set puzzle
35 Simple database
35 Solve a Hidato puzzle
35 Sorting algorithms/Cycle sort
35 Topic variable O O
35 Unprimeable numbers
35 Use another language to call a function
35 Weird numbers
35 Word break problem
34 Bitmap/Histogram
34 Chebyshev coefficients
34 Chemical calculator
34 Decision tables
34 Distinct power numbers
34 Executable library
34 Faulhaber's formula
34 Find squares n where n+1 is prime
34 Generate random numbers without repeating a value
34 Jacobi symbol
34 Largest prime factor
34 Law of cosines - triples
34 Long literals, with continuations
34 Mayan numerals
34 Memory layout of a data structure O
34 Mian-Chowla sequence
34 Minimum multiple of m where digital sum equals m
34 Multiplicative order
34 Neighbour primes
34 Numbers in base 10 that are palindromic in bases 2, 4, and 16
34 Parallel brute force
34 Pierpont primes
34 Primes with digits in nondecreasing order
34 Straddling checkerboard
34 Wieferich primes
34 Words from neighbour ones
34 Write to Windows event log
34 Zhang-Suen thinning algorithm
33 Abelian sandpile model
33 Append numbers at same position in strings
33 Bin given limits
33 Bitcoin/address validation
33 Check input device is a terminal
33 Checkpoint synchronization
33 Common list elements
33 Day of the week of Christmas and New Year
33 Doomsday rule
33 First perfect square in base n with n unique digits
33 Four sides of square
33 Increasing gaps between consecutive Niven numbers
33 Jacobsthal numbers
33 Mosaic matrix
33 Pragmatic directives
33 Random Latin squares
33 Range consolidation
33 Set of real numbers
33 Sum and product puzzle
33 Summarize primes
33 Super-d numbers
33 Unique characters in each string
33 Verify distribution uniformity/Chi-squared test
32 Arithmetic numbers
32 Chat server O
32 Common sorted list
32 Deconvolution/1D
32 Exactly three adjacent 3 in lists
32 Execute SNUSP
32 Find minimum number of coins that make a given value
32 Finite state machine
32 Generate random chess position
32 Go Fish
32 HTTPS/Authenticated
32 Hunt the Wumpus
32 Keyboard macros
32 Last list item
32 Monads/Maybe monad
32 Nonoblock
32 Numeric error propagation
32 Product of min and max prime factors
32 Ramsey's theorem
32 Rosetta Code/Fix code tags
32 State name puzzle
32 Stirling numbers of the first kind
32 Stirling numbers of the second kind
32 Video display modes
32 Window creation/X11 O
31 A* search algorithm
31 Arena storage pool
31 Bioinformatics/Sequence mutation
31 Biorhythms
31 Check Machin-like formulas
31 Compiler/virtual machine interpreter
31 Cullen and Woodall numbers
31 Erdős-primes
31 First class environments
31 Largest five adjacent number
31 N-smooth numbers
31 Plasma effect
31 Reverse the order of lines in a text file while preserving the contents of each line
31 Stream merge
31 Sylvester's sequence
31 Teacup rim text
31 The ISAAC cipher
31 Update a configuration file
30 Birthday problem
30 De Bruijn sequences
30 Descending primes
30 Fermat numbers
30 Formal power series
30 Honeycombs
30 Kronecker product based fractals
30 Natural sorting
30 Next highest int from digits
30 Odd words
30 Prime numbers which contain 123
30 Reflection/List methods O
30 Same fringe
30 Sierpinski pentagon
30 Sorting algorithms/Cocktail sort with shifting bounds
30 Sum of primes in odd positions is prime
30 Sum of square and cube digits of an integer are primes
30 Table creation
30 Tonelli-Shanks algorithm
29 Active Directory/Connect
29 Audio alarm
29 Changeable words
29 Cut a rectangle
29 Find adjacent primes which differ by a square integer
29 Find largest left truncatable prime in a given base
29 Fixed length records
29 Fraction reduction
29 Legendre prime counting function
29 Merge and aggregate datasets
29 Monads/List monad
29 Numbers which are the cube roots of the product of their proper divisors
29 Numeric separator syntax
29 Palindromic gapful numbers
29 Piprimes
29 Play recorded sounds
29 Pseudo-random numbers/PCG32
29 Safe addition
29 Sequence of primorial primes
29 Shortest common supersequence
29 Sleeping Beauty problem
29 Snake and ladder
29 Solve a Holy Knight's tour
29 Summation of primes
29 Sunflower fractal
29 Superpermutation minimisation
29 Thiele's interpolation formula
29 World Cup group stage
28 Almkvist-Giullera formula for pi
28 Card shuffles
28 Cipolla's algorithm
28 Cistercian numerals
28 Continued fraction/Arithmetic/G(matrix ng, continued fraction n)
28 Coprime triplets
28 Deceptive numbers
28 Deming's funnel
28 Distributed programming
28 Elliptic curve arithmetic
28 Exponentiation with infix operators in (or operating on) the base
28 Idiomatically determine all the characters that can be used for symbols
28 Image convolution
28 Intersecting number wheels
28 K-means++ clustering
28 Nautical bell
28 Numbers whose count of divisors is prime
28 Odd squarefree semiprimes
28 Order by pair comparisons
28 Padovan sequence
28 Paraffins
28 Playfair cipher
28 Sierpinski arrowhead curve
28 Smallest power of 6 whose decimal expansion contains n
28 Special neighbor primes
28 Spelling of ordinal numbers
28 Total circles area
28 UPC
28 Welch's t-test
28 Yahoo! search interface
27 Base58Check encoding
27 Consecutive primes with ascending or descending differences
27 Curzon numbers
27 Euler's constant 0.5772...
27 Function frequency
27 Getting the number of decimal places
27 Kolakoski sequence
27 Linux CPU utilization
27 Magic squares of singly even order
27 Make a backup file
27 Matrix chain multiplication
27 Mind boggling card trick
27 Palindromic primes
27 Parse an IP Address
27 Percolation/Mean run density
27 Permutations/Rank of a permutation
27 Permuted multiples
27 Prime triplets
27 Prime words
27 Quadrat special primes
27 RCRPG
27 Ramer-Douglas-Peucker line simplification
27 Selectively replace multiple instances of a character within a string
27 Self numbers
27 Simulate input/Keyboard
27 Smallest multiple
27 Snake
26 15 puzzle solver
26 Commatizing numbers
26 Concatenate two primes is also prime
26 Elementary cellular automaton/Random number generator
26 File size distribution
26 Hough transform
26 Kosaraju
26 List rooted trees
26 Longest substrings without repeating characters
26 Lucky and even lucky numbers
26 Markov chain text generator
26 Orbital elements
26 Palindromic primes in base 16
26 Rare numbers
26 Record sound
26 Reverse the gender of a string
26 Ulam numbers
25 ASCII art diagram converter
25 Abelian sandpile model/Identity
25 Assertions in design by contract
25 Compiler/code generator
25 Cubic special primes
25 EKG sequence convergence
25 Index finite lists of positive integers
25 Joystick position
25 Largest product in a grid
25 Mastermind
25 Next special primes
25 Print debugging statement
25 Print itself O
25 Pseudo-random numbers/Xorshift star
25 Reflection/Get source O
25 SOAP
25 Sine wave
25 Solve a Hopido puzzle
25 Solve a Numbrix puzzle
25 Sum data type
25 Sum of two adjacent numbers are primes
25 Zeckendorf arithmetic
24 Active Directory/Search for a user
24 Addition chains
24 Bilinear interpolation
24 Brilliant numbers
24 Compiler/syntax analyzer
24 Continued fraction/Arithmetic/G(matrix ng, continued fraction n1, continued fraction n2)
24 Create an object/Native demonstration O
24 Cyclops numbers
24 Find duplicate files
24 Levenshtein distance/Alignment
24 Magic constant
24 Main step of GOST 28147-89
24 N-body problem
24 Native shebang
24 Own digits power sum
24 Padovan n-step number sequences
24 Perceptron
24 Permutations with some identical elements
24 Pseudo-random numbers/Splitmix64
24 Sequence: nth number with exactly n divisors
24 Sokoban
24 Solve triangle solitare puzzle
24 The sieve of Sundaram
24 Untrusted environment
24 Vigenère cipher/Cryptanalysis
24 Wilson primes of order n
23 Collect and sort square numbers in ascending order from three lists
23 Colorful numbers
23 Determine sentence type
23 Factorial primes
23 Honaker primes
23 Knuth's power tree
23 Largest difference between adjacent primes
23 Latin Squares in reduced form
23 Line circle intersection
23 Median filter
23 Metallic ratios
23 Names to numbers
23 Nested templated data
23 Nonogram solver
23 Pig the dice game/Player
23 Polynomial synthetic division
23 Primes whose first and last number is 3
23 Riordan numbers
23 Sierpinski curve
23 Singly-linked list/Element removal
23 Soloway's recurring rainfall
23 Sort primes from list to a list
23 Special factorials
23 Substring primes
23 Useless instructions
23 Variable declaration reset
23 Vibrating rectangles
23 Vogel's approximation method
22 Air mass
22 Bitcoin/public point to address
22 Data Encryption Standard
22 Draw pixel 2
22 Eertree
22 Elementary cellular automaton/Infinite length
22 Goldbach's comet
22 Idoneal numbers
22 Juggler sequence
22 Klarner-Rado sequence
22 Matrix digital rain
22 Monads/Writer monad
22 Montgomery reduction
22 Peaceful chess queen armies
22 Practical numbers
22 Primes which contain only one odd digit
22 Pseudo-random numbers/Combined recursive generator MRG32k3a
22 Selective file copy
22 Simulate input/Mouse
22 Smallest numbers
22 Window management
21 Anadromes
21 Arithmetic coding/As a generalized change of radix
21 Aspect oriented programming
21 Compare sorting algorithms' performance
21 Cyclotomic polynomial
21 Giuga numbers
21 Imaginary base numbers
21 Jaro-Winkler distance
21 Just in time processing on a character stream
21 K-d tree
21 Largest palindrome product
21 Logistic curve fitting in epidemiology
21 Minimum primes
21 Nimber arithmetic
21 Ormiston pairs
21 Pancake numbers
21 Pandigital prime
21 Percolation/Site percolation
21 Periodic table
21 Primes - allocate descendants to their ancestors
21 Quoting constructs
21 Readline interface
21 Separate the house number from the street name
21 Special pythagorean triplet
21 Transportation problem
21 Two bullet roulette
21 Word ladder
21 Wordle comparison
20 Bitmap/Read an image through a pipe
20 Color quantization
20 Compiler/AST interpreter
20 De Polignac numbers
20 Double Twin Primes
20 HTTPS/Client-authenticated
20 Long stairs
20 Meissel–Mertens constant
20 Most frequent k chars distance
20 P-value correction
20 Percolation/Mean cluster density
20 SQL-based authentication
20 Safe and Sophie Germain primes
20 Self-hosting compiler
20 Sierpinski square curve
20 Sphenic numbers
20 Square root by hand
20 Terminal control/Positional read
20 Two's complement
20 Wagstaff primes
19 Bitmap/PPM conversion through a pipe
19 Camel case and snake case
19 Chernick's Carmichael numbers
19 Code segment unload
19 Conjugate a Latin verb
19 Erdős-Nicolas numbers
19 Euclid-Mullin sequence
19 Find URI in text
19 Fortunate numbers
19 Free polyominoes enumeration
19 Gradient descent
19 Modified random distribution
19 Prime numbers p for which the sum of primes less than or equal to p is prime
19 Prime triangle
19 Proof O
19 SHA-256 Merkle tree
19 Simulated annealing
19 Tarjan
19 VList
19 XML validation
18 Achilles numbers
18 Banker's algorithm
18 Distribution of 0 digits in factorial series
18 Duffinian numbers
18 Longest palindromic substrings
18 Minimal steps down to 1
18 NYSIIS
18 Non-transitive dice
18 Numerical integration/Adaptive Simpson's method
18 Particle swarm optimization
18 Penrose tiling
18 Percolation/Bond percolation
18 Pseudorandom number generator image
18 Ramanujan's constant
18 Rendezvous O
18 Retrieve and search chat history
18 Rhonda numbers
18 Ruth-Aaron numbers
18 Safe mode
18 Suffix tree
18 Three word location
18 Tree from nesting levels
18 Word search
17 Bioinformatics/Subsequence
17 Canny edge detector
17 Execute Computer/Zero
17 Four is the number of letters in the ...
17 Geohash
17 Geometric algebra
17 Hex words
17 Inconsummate numbers in base 10
17 O'Halloran numbers
17 Overloaded operators
17 Sorting algorithms/Tree sort on a linked list
17 Topological sort/Extracted top item
16 Binary coded decimal
16 CalmoSoft primes
16 Composite numbers k with no single digit factors whose factors are all substrings of k
16 Count the coins/0-1
16 Interactive help
16 OpenWebNet password
16 Pentomino tiling
16 Pisano period
16 Polynomial derivative
16 Railway circuit
16 Rodrigues’ rotation formula
16 Run as a daemon or service
16 Text completion
16 Tropical algebra overloading
16 Unit testing
16 Untouchable numbers
16 XXXX redacted
15 Arithmetic derivative
15 Calmo numbers
15 Curve that touches three points
15 Earliest difference between prime gaps
15 Factorial base numbers indexing permutations of a collection
15 Forbidden numbers
15 Functional coverage tree
15 Gotchas
15 Iterators
15 Jaccard index
15 Minkowski question-mark function
15 Multi-base primes
15 One-time pad
15 Ormiston triples
15 Repunit primes
15 Round-robin tournament schedule
15 Set right-adjacent bits
15 Tetris
14 Audio frequency generator
14 Checksumcolor
14 Colour pinstripe/Printer
14 Deconvolution/2D+
14 Display an outline as a nested table
14 Distance and Bearing
14 Equal prime and composite sums
14 Erdös-Selfridge categorization of primes
14 Even numbers which cannot be expressed as the sum of two twin primes
14 Find Chess960 starting position identifier
14 Generalised floating point addition
14 Greed
14 Hourglass puzzle
14 Isograms and heterograms
14 Launch rocket with countdown and acceleration in stdout
14 Pell numbers
14 Penta-power prime seeds
14 Powerful numbers
14 SEND + MORE = MONEY
14 Solve hanging lantern problem
14 Ultra useful primes
14 Using a speech engine to highlight words
14 Verhoeff algorithm
14 War card game
13 Anaprimes
13 Catmull–Clark subdivision surface
13 Execute CopyPasta Language
13 Extreme primes
13 Faces from a mesh
13 Fibonacci matrix-exponentiation
13 Gaussian primes
13 Graph colouring
13 Home primes
13 Magic numbers
13 Mayan calendar
13 N-grams
13 Quad-power prime seeds
13 Spoof game
13 Time-based one-time password algorithm
13 Triangular numbers
13 Wolstenholme numbers
13 Wordiff
12 16 puzzle game
12 ADFGVX cipher
12 Combinations with repetitions/Square digit chain
12 Distinct palindromes within decimal numbers
12 External sort
12 French Republican calendar
12 Iccanobif primes
12 Morpion solitaire
12 Numbers which are not the sum of distinct squares
12 Pairs with common factors
12 Pan base non-primes
12 Pinstripe/Printer
12 Primes: n*2^m+1
12 Ramanujan primes
12 Range modifications
12 Rosetta Code/Rank languages by number of users
12 Rosetta Code/Tasks without examples
12 Search in paragraph's text
12 Simple turtle graphics
12 Square form factorization
12 Starting a web browser
12 Suffixation of decimal numbers
12 Terminal control/Restricted width positional input/No wrapping
12 Tree datastructures
12 Upside-down numbers
11 ASCII control characters
11 Addition-chain exponentiation
11 Binomial transform
11 Bioinformatics/Global alignment
11 Boyer-Moore string search
11 Brace expansion using ranges
11 Countdown
11 Discrete Fourier transform
11 IPC via named pipe
11 Numerical and alphabetical suffixes
11 OpenGL/Utah teapot
11 Parse EBNF
11 Penholodigital squares
11 Resistance calculator
11 Sieve of Pritchard
11 Sort an outline at every level
11 Super-Poulet numbers
11 Terminal control/Restricted width positional input/With wrapping
11 URL shortener
10 Compiler/Verifying syntax
10 Elliptic Curve Digital Signature Algorithm
10 Integer long division
10 Knuth-Morris-Pratt string search
10 N-queens minimum and knights and bishops
10 Resistance network calculator
10 Robots
10 Solve equations with substitution method
10 Sub-unit squares
10 Text to HTML
10 User defined pipe and redirection operators
10 Zsigmondy numbers
9 B-spline
9 Babylonian spiral
9 Black box
9 Doubly-linked list/Element removal
9 Fermat pseudoprimes
9 Fibonacci heap
9 I'm a software engineer, get me out of here
9 Marching squares
9 Multidimensional Newton-Raphson method
9 OpenGL pixel shader
9 Price list behind API
9 Ramanujan primes/twins
9 Random sentence from book
9 Rosetta Code/Run examples
9 Singular value decomposition
9 Smallest enclosing circle problem
9 Smarandache-Wellin primes
9 Tamagotchi emulator
9 Transliterate English text using the Greek alphabet
9 Wasteful, equidigital and frugal numbers
9 Worthwhile task shaving
8 Audio overlap loop
8 Dating agency
8 Factor-perfect numbers
8 Hexapawn
8 Horse racing
8 Inner classes
8 P-Adic numbers, basic
8 Peripheral drift illusion
8 Raster bars
8 Recursive descent parser generator
8 Remote agent/Agent logic
8 Remote agent/Simulation
8 Segmentation fault protection
8 Singly-linked list/Reversal
8 Smallest number k such that k+2^m is composite for all m less than k
8 Strassen's algorithm
8 Waveform analysis/Doh ray me O
8 WiktionaryDumps to words
7 Apéry's constant
7 Bifid cipher
7 Boids
7 Boustrophedon transform
7 Chess player
7 Compiler/Simple file inclusion pre processor
7 Engel expansion
7 English cardinal anagrams
7 Latin Squares in reduced form/Randomizing using Jacobson and Matthews’ Technique
7 Least m such that n! + m is prime
7 Process SMIL directives in XML data
7 Remote agent/Agent interface
7 Solve a Rubik's cube
7 Sorensen–Dice coefficient
7 Statistics/Chi-squared distribution
6 Anagram generator
6 Autogram checker
6 Convert CSV records to TSV
6 Create an executable for a program in an interpreted language
6 Create your own text control codes
6 Cycles of a permutation
6 Divide a rectangle into a number of unequal triangles
6 Dominoes
6 OLE automation O O
6 P-Adic square roots
6 Particle fountain
6 Red black tree sort
6 Rosetta Code/List authors of task descriptions
6 Selection bias in clinical sciences
6 Use a REST API
6 Wave function collapse
5 CLI-based maze-game
5 Erdős–Woods numbers
5 Generalised floating point multiplication
5 Multiton
5 Number triplets game
5 Solving coin problems
5 Unicode polynomial equation
5 Vidir
5 Visitor pattern
5 Waveform analysis/Top and tail
5 Weather routing
4 15 puzzle game in 3D
4 Blackjack strategy
4 Compiler/Preprocessor
4 Cross compilation
4 Diophantine linear system solving
4 IRC gateway
4 Protecting Memory Secrets
4 Sanitize user input
4 Ukkonen’s suffix tree construction
4 Uno (card game)
4 WebGL rotating F
3 3d turtle graphics
3 Elevator simulation