Rosetta Code/Count examples/Full list/Tier 2

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Revision as of 20:15, 6 June 2021 by Thundergnat (talk | contribs) (Update full list output)

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 Java          ⑫ REXX          ⑬ Racket        ⑭ C++           ⑮ J            
    ⑯ Haskell       ⑰ Ruby          ⑱ Zkl           ⑲ Tcl           ⑳ D            
As of 2021-06-06T20:13:57Z :: Tasks: 1104 :: Draft Tasks:283 :: Total Tasks: 1387 :: Total Examples: 76880
Count Task
492 Hello world/Text
324 99 bottles of beer
317 100 doors
316 FizzBuzz
291 Fibonacci sequence
288 Factorial
276 Comments
268 A+B
261 Empty program
239 Function definition
229 Loops/Infinite
226 Reverse a string
225 Loops/While
224 Arrays
222 Ackermann function  
206 Loops/For
202 Conditional structures
200 Greatest common divisor
197 Arithmetic/Integer
197 Greatest element of a list
189 Array concatenation
187 Even or odd
185 Integer comparison
185 Repeat a string
184 Averages/Arithmetic mean
183 Increment a numerical string
178 Hello world/Graphical
173 Copy a string
173 Sieve of Eratosthenes
170 Boolean values
168 Binary digits
168 Loops/Downward for
168 String concatenation
167 Character codes
166 Apply a callback to an array
166 Towers of Hanoi
164 Array length
164 Hello world/Newline omission
164 Loops/Do-while
164 Loops/N plus one half
164 Palindrome detection
164 Sum and product of an array
163 Loops/For with a specified step
163 Loops/Foreach
163 String length
162 Integer sequence
162 Sum of a series
161 String case
161 Tokenize a string
160 Loops/Break
158 Rot-13
156 Dot product
155 Generic swap
155 Leap year
155 Sum of squares
154 Empty string
154 Hailstone sequence
154 Logical operations
153 Filter
151 Quine
150 Associative array/Creation
149 Sort an integer array
148 Sorting algorithms/Bubble sort
146 Execute a system command
146 Roman numerals/Encode
145 Factors of an integer
144 Caesar cipher
144 System time
143 Guess the number
143 Loop over multiple arrays simultaneously
143 Remove duplicate elements
142 Determine if a string is numeric
142 Higher-order functions
141 Sorting algorithms/Quicksort
141 User input/Text
140 File input/output
139 Luhn test of credit card numbers
137 Bitwise operations
137 Day of the week
137 Primality by trial division
136 Hello world/Standard error
135 Command-line arguments
135 Read entire file
134 Create a file
134 Happy numbers
134 Mutual recursion
134 Stack
134 Substring
134 Zero to the zero power
133 Loops/Continue
132 Sleep
131 Check that file exists
131 Generate lower case ASCII alphabet
131 Pascal's triangle
130 Least common multiple
129 ABC problem
129 Literals/String
128 Date format
128 Flatten a list
126 Balanced brackets
126 Variables
125 Ethiopian multiplication
125 Program termination
124 Binary search
124 Compound data type
123 Formatted numeric output
123 Function composition
123 Include a file  
123 Literals/Integer
123 Mandelbrot set
122 Detect division by zero
122 Roman numerals/Decode
121 Associative array/Iteration
121 Count occurrences of a substring
121 Loops/Nested
120 Averages/Root mean square
120 Knuth shuffle
120 N-queens problem
119 Count in octal
119 Null object
119 Read a file line by line
119 Sorting algorithms/Insertion sort
117 Multiplication tables
117 Search a list
116 Anagrams
116 Guess the number/With feedback
116 Hash from two arrays
116 Identity matrix
116 Matrix transposition
116 Pick random element
116 Real constants and functions
115 Case-sensitivity of identifiers
115 Delete a file
115 File size
115 Letter frequency
115 Matrix multiplication
114 Averages/Median
114 Babbage problem
114 Classes  
114 Find limit of recursion
114 Rename a file
114 String matching
113 Align columns
113 Environment variables
113 Input loop
112 Haversine formula
112 Pangram checker
112 Random numbers
111 HTTP
111 Hostname  
111 Perfect numbers
111 Return multiple values
110 Arithmetic/Complex
110 Look-and-say sequence
109 Assertions
109 Conway's Game of Life
108 Accumulator factory
108 Catalan numbers
108 Infinity
108 Temperature conversion
107 Sierpinski triangle
107 Strip a set of characters from a string
107 Variadic function
106 Arithmetic-geometric mean
106 Averages/Pythagorean means
106 Horner's rule for polynomial evaluation
106 Levenshtein distance
106 Permutations
106 Substring/Top and tail
105 Evaluate binomial coefficients
105 Prime decomposition
105 Program name
105 Run-length encoding
105 String append
104 Anonymous recursion
104 Reverse words in a string
104 Strip whitespace from a string/Top and tail
104 Zig-zag matrix
103 Bulls and cows
103 Comma quibbling
103 Regular expressions
103 String interpolation (included)
102 Exceptions
102 Nth root
102 Queue/Definition
102 Sorting algorithms/Merge sort
102 Trigonometric functions
101 Combinations
101 Ordered words
100 Middle three digits
100 The Twelve Days of Christmas
99 Call a function
99 Shell one-liner  
99 Short-circuit evaluation
99 Sorting algorithms/Selection sort
99 String prepend
99 Sum digits of an integer
98 24 game
98 Create a two-dimensional array at runtime
98 Power set
98 Sum multiples of 3 and 5
98 Vector products
97 Arbitrary-precision integers (included)
97 Harshad or Niven series
97 Range extraction
97 Sierpinski carpet
96 Interactive programming    
96 Range expansion
96 Y combinator
95 Digital root
95 Enumerations
95 N'th
95 Sorting algorithms/Gnome sort
94 Collections
94 Execute Brain****
94 Time a function
94 Walk a directory/Non-recursively
93 Evolutionary algorithm
93 First-class functions
93 Sequence of non-squares
93 Sorting algorithms/Cocktail sort
92 Averages/Mode
92 Create an HTML table
92 Exponentiation operator
92 Inheritance/Single  
92 MD5
92 One-dimensional cellular automata
91 Cumulative standard deviation
91 Dragon curve
91 Random number generator (included)
90 Abundant, deficient and perfect number classifications
90 Forward difference
90 Hello world/Newbie
90 JSON  
90 Sort using a custom comparator
90 Sorting algorithms/Bogosort
90 Symmetric difference
89 Averages/Simple moving average
89 Hamming numbers
89 Josephus problem
89 Monty Hall problem
89 String comparison
88 Entropy
88 Gray code
88 Langton's ant
88 Price fraction
87 Amicable pairs
87 Greatest subsequential sum
87 Hofstadter Q sequence
87 Number names
86 CSV data manipulation
86 Catamorphism
86 Five weekends
86 Menu
86 Number reversal game
86 Sorting algorithms/Heapsort
86 Tree traversal
85 Abstract type
85 CSV to HTML translation
85 Compare a list of strings
85 Map range
84 Almost prime
84 SEDOLs
83 Last Friday of each month
83 Non-decimal radices/Convert
83 Queue/Usage
83 Simple windowed application    
83 Sort an array of composite structures
83 Walk a directory/Recursively
83 Window creation    
82 Closures/Value capture
82 File modification time
82 Introspection
82 Set
82 Terminal control/Clear the screen  
82 URL decoding
81 Box the compass
81 Calculating the value of e
81 Count in factors
81 Monte Carlo methods
81 Top rank per group
80 Find the last Sunday of each month
80 Floyd's triangle
80 Hello world/Line printer  
80 Literals/Floating point  
80 Long multiplication
80 Roots of unity
80 Sorting algorithms/Shell sort
80 Terminal control/Ringing the terminal bell
80 Word wrap
79 Bitmap
79 Count the coins
79 Find common directory path
79 Jensen's Device
79 Playing cards
79 Show the epoch
79 Singly-linked list/Traversal
79 Spiral matrix
79 Split a character string based on change of character
79 Web scraping  
79 XML/Input
78 Address of a variable      
78 CRC-32
78 Concurrent computing  
78 Date manipulation
78 Multifactorial
78 Operator precedence
78 Order two numerical lists
78 Pythagorean triples  
78 Read a specific line from a file
78 Repeat
78 Sockets  
78 Sorting algorithms/Counting sort
77 Dynamic variable names    
77 Knapsack problem/0-1
77 Linear congruential generator
77 Lucas-Lehmer test
77 Proper divisors
77 Strip comments from a string
77 URL encoding
76 Averages/Mean angle
76 Call an object method    
76 Find the missing permutation
76 Here document  
76 Kaprekar numbers
76 Keyboard input/Obtain a Y or N response      
76 Munchausen numbers  
76 Soundex  
75 Man or boy test
75 Modular inverse
75 Non-decimal radices/Output
75 Phrase reversals
75 Population count
75 Show ASCII table
75 Sorting algorithms/Comb sort
75 Unicode variable names  
74 Anagrams/Deranged anagrams
74 Calendar
74 Equilibrium index
74 List comprehensions
74 Parsing/RPN calculator algorithm
74 Pi  
74 Read a configuration file
74 SHA-1  
74 Semordnilap
74 Write entire file
73 Fibonacci n-step number sequences
73 Gamma function  
73 Hello world/Web server
73 Multiple distinct objects
73 Sort disjoint sublist
73 Sudoku
72 Animation  
72 Empty directory
72 Exceptions/Catch an exception thrown in a nested call
72 Execute HQ9+
72 Guess the number/With feedback (player)
72 Rock-paper-scissors  
72 SHA-256  
72 Singly-linked list/Element definition
72 Special characters  
72 Take notes on the command line
72 Vigenère cipher
72 Zeckendorf number representation
71 AKS test for primes
71 Convert seconds to compound duration
71 Euler's sum of powers conjecture
71 Longest common subsequence
71 Polymorphism  
71 Rep-string
71 Stair-climbing puzzle
70 Bitmap/Bresenham's line algorithm
70 Call a foreign-language function
70 Currying
70 Enforced immutability
70 Four bit adder
70 Fractal tree  
70 Horizontal sundial calculations  
70 IBAN
70 Largest int from concatenated ints
70 Old lady swallowed a fly
70 Quaternion type
70 Sorting algorithms/Stooge sort
70 Trabb Pardo–Knuth algorithm
70 Write float arrays to a text file
69 15 puzzle game    
69 Catalan numbers/Pascal's triangle
69 Closest-pair problem
69 Combinations with repetitions
69 Constrained random points on a circle
69 Draw a sphere
69 Flow-control structures
69 Magic squares of odd order
69 Maze generation
69 Numerical integration
69 Self-describing numbers
69 Sorting algorithms/Pancake sort
68 Barnsley fern  
68 Euler method
68 Extend your language    
68 Jump anywhere
68 Named parameters    
68 Priority queue
68 Text processing/Max licenses in use
68 Thue-Morse
67 Amb    
67 Benford's law
67 Chinese remainder theorem
67 Fast Fourier transform
67 Fork
67 Morse code  
67 Nested function
67 Pernicious numbers
67 Roots of a function
67 Sequence of primes by trial division
67 Special variables  
67 Unix/ls
67 Van der Corput sequence
66 Anti-primes
66 Arithmetic/Rational
66 Department numbers
66 One of n lines in a file
66 Remove lines from a file
66 Runtime evaluation      
66 Sort stability
66 Strip control codes and extended characters from a string
66 Variable size/Get  
65 Documentation    
65 General FizzBuzz
65 HTTPS    
65 Hofstadter-Conway $10,000 sequence
65 Inheritance/Multiple  
65 Narcissistic decimal number
65 Optional parameters
65 Roots of a quadratic function
64 Angle difference between two bearings
64 Continued fraction
64 Factors of a Mersenne number
64 Jewels and stones
64 Reduced row echelon form
64 Word frequency
64 XML/Output
63 Damm algorithm  
63 Exponentiation order
63 Memory allocation
63 Non-decimal radices/Input
63 Semiprime
63 Singly-linked list/Element insertion
63 Stern-Brocot sequence
63 Tic-tac-toe  
63 Undefined values  
63 Write language name in 3D ASCII
63 Yin and yang
62 100 prisoners  
62 Animate a pendulum    
62 Arithmetic evaluation
62 Best shuffle
62 Binary strings
62 Cholesky decomposition
62 Circles of given radius through two points
62 Get system command output
62 Globally replace text in several files
62 Modular exponentiation
62 Mouse position            
62 Plot coordinate pairs  
62 Probabilistic choice
62 Runge-Kutta method
62 Sort three variables
61 Averages/Mean time of day
61 Sorting algorithms/Sleep sort  
61 User input/Graphical    
60 24 game/Solve
60 Bitmap/Write a PPM file
60 Draw a clock  
60 Generator/Exponential
60 Knapsack problem/Continuous
60 Miller–Rabin primality test  
60 Partial function application
60 Test a function  
60 Truncatable primes
60 Unicode strings  
59 9 billion names of God the integer
59 Brownian tree
59 CUSIP
59 Cartesian product of two or more lists
59 Dutch national flag problem
59 Emirp primes
59 Extract file extension
59 Host introspection    
59 Huffman coding
59 Knapsack problem/Unbounded  
59 Left factorials
59 Sorting algorithms/Bead sort
59 Subleq
58 2048  
58 4-rings or 4-squares puzzle
58 Abundant odd numbers  
58 Add a variable to a class instance at runtime          
58 Compile-time calculation    
58 Hash join
58 JortSort
58 Knight's tour
58 Ludic numbers
58 Odd word problem
58 Random number generator (device)
58 Two sum  
57 Deal cards for FreeCell
57 Delegates    
57 Draw a cuboid
57 I before E except after C
57 Integer overflow
57 LZW compression
57 Leonardo numbers  
57 Longest common prefix
57 Mad Libs
57 Matrix-exponentiation operator      
57 Multisplit
57 Scope modifiers    
57 Sorting algorithms/Permutation sort
57 Stem-and-leaf plot
57 Terminal control/Coloured text    
57 Terminal control/Display an extended character
57 Topological sort
57 Truncate a file  
57 Van Eck sequence
56 DNS query
56 Dinesman's multiple-dwelling problem
56 Discordian date
56 Doubly-linked list/Element definition
56 Extreme floating point values    
56 Fibonacci word
56 Forest fire  
56 Magic 8-ball
56 Rosetta Code/Rank languages by popularity
56 Sierpinski triangle/Graphical  
56 Singleton    
56 Square but not cube  
55 Base64 encode data
55 Define a primitive data type    
55 Determine if a string has all the same characters
55 Grayscale image  
55 Long year      
55 Modulinos  
55 Munching squares
55 Pascal matrix generation
55 Stack traces    
54 Attractive numbers
54 Determine if a string is collapsible  
54 Draw a pixel        
54 Handle a signal  
54 Pointers and references  
54 Quickselect algorithm
54 Runtime evaluation/In an environment      
54 Synchronous concurrency  
54 Terminal control/Cursor positioning      
54 Ternary logic  
54 Unbias a random generator
54 Universal Turing machine
54 Wireworld  
54 XML/XPath    
53 Base64 decode data      
53 Bernoulli numbers
53 Chinese zodiac  
53 Convert decimal number to rational  
53 Dining philosophers
53 FASTA format  
53 Iterated digits squaring
53 Keyboard input/Keypress check      
53 Loops/Increment loop index within loop body  
53 Maximum triangle path sum
53 Non-continuous subsequences
53 Perfect shuffle
53 Send email    
53 Statistics/Basic
53 Validate International Securities Identification Number
53 Vector
53 XML/DOM serialization    
52 Call a function in a shared library  
52 Copy stdin to stdout    
52 Dijkstra's algorithm
52 First-class functions/Use numbers analogously    
52 Heronian triangles
52 ISBN13 check digit  
52 Inverted syntax
52 Longest common substring  
52 Longest increasing subsequence
52 Polynomial regression
52 Rate counter
52 Seven-sided dice from five-sided dice
52 Smith numbers
52 Strip block comments
52 Text processing/2
52 Tokenize a string with escaping
51 Farey sequence
51 Gaussian elimination
51 Holidays related to Easter      
51 McNuggets problem      
51 Move-to-front algorithm
51 Pig the dice game
51 Respond to an unknown method call      
51 Sattolo cycle  
51 Shoelace formula for polygonal area  
50 Archimedean spiral  
50 Associative array/Merging  
50 Colour bars/Display    
50 Find the intersection of two lines  
50 Fractran
50 GUI component interaction      
50 Jaro similarity
50 Make directory path
50 Naming conventions      
50 Password generator    
50 RPG attributes generator    
50 Search a list of records  
50 Zebra puzzle
49 Cantor set  
49 Chaos game      
49 Determinant and permanent
49 Doubly-linked list/Traversal
49 Kernighans large earthquake problem
49 Last letter-first letter
49 Metaprogramming    
49 Sort numbers lexicographically  
49 Text processing/1  
48 Doubly-linked list/Element insertion
48 Execute a Markov algorithm
48 Extensible prime generator
48 Greyscale bars/Display      
48 Hofstadter Figure-Figure sequences
48 Longest string challenge  
48 Polymorphic copy    
48 Polynomial long division
48 Stable marriage problem
48 Visualize a tree
48 Water collected between towers
47 Append a record to the end of a text file
47 Bitmap/Flood fill
47 Determine if a string has all unique characters  
47 Echo server      
47 History variables  
47 Kronecker product  
47 Narcissist  
47 OpenGL      
47 Ulam spiral (for primes)
46 Active object    
46 Average loop length
46 Determine if only one instance is running    
46 Egyptian division  
46 Element-wise operations
46 Problem of Apollonius  
46 Set consolidation  
46 Sorting algorithms/Radix sort
46 Verify distribution uniformity/Naive
45 Bulls and cows/Player
45 Doubly-linked list/Definition
45 Image noise  
45 Parsing/Shunting-yard algorithm
45 Remove vowels from a string        
45 Rosetta Code/Count examples    
45 Send an unknown method call        
45 Sparkline in unicode
45 Taxicab numbers
44 Atomic updates    
44 Bitmap/Read a PPM file    
44 Carmichael 3 strong pseudoprimes
44 Elementary cellular automaton  
44 GUI/Maximum window dimensions          
44 Gapful numbers  
44 Generate Chess960 starting position
44 Nim game        
44 Secure temporary file    
44 Spinning rod animation/Text        
44 Subtractive generator
44 Sum to 100
44 Text between
44 Truth table  
43 Currency    
43 Determine if a string is squeezable  
43 Flipping bits game  
43 Fusc sequence
43 Hickerson series of almost integers
43 Keyboard input/Flush the keyboard buffer        
43 Knapsack problem/Bounded
43 MD5/Implementation      
43 Percentage difference between images  
43 S-expressions  
43 Table creation/Postal addresses      
43 Twelve statements
43 UTF-8 encode and decode    
43 Voronoi diagram  
42 Aliquot sequence classifications
42 Balanced ternary  
42 Bitmap/Midpoint circle algorithm  
42 Calendar - for "REAL" programmers      
42 Days between dates    
42 Deepcopy        
42 Digital root/Multiplicative digital root
42 Fivenum  
42 Hilbert curve    
42 Permutations by swapping
42 Permutations/Derangements  
42 Sort a list of object identifiers  
42 Sorting Algorithms/Circle Sort  
42 Speech synthesis          
42 Start from a main routine        
42 Summarize and say sequence
42 Terminal control/Dimensions        
42 The Name Game    
41 Bell numbers    
41 Combinations and permutations  
41 Inverted index  
41 Musical scale          
41 Parallel calculations    
41 Pascal's triangle/Puzzle
41 Permutation test
41 Primorial numbers  
41 Sailors, coconuts and a monkey problem
41 Sorting algorithms/Strand sort
41 Topswops
41 Two identical strings            
41 Variable size/Set    
40 21 game      
40 Casting out nines
40 Chowla numbers  
40 Color of a screen pixel          
40 Cramer's rule
40 Euler's identity  
40 GUI enabling/disabling of controls        
40 Julia set    
40 Magic squares of doubly even order    
40 Parametric polymorphism      
40 Prime conspiracy  
40 Recaman's sequence    
40 Scope/Function names and labels      
40 Statistics/Normal distribution  
40 Variable-length quantity
39 Abbreviations, automatic  
39 Brace expansion
39 Brazilian numbers    
39 Colour pinstripe/Display          
39 Create a file on magnetic tape    
39 Cycle detection  
39 Feigenbaum constant calculation  
39 Kahan summation  
39 Knuth's algorithm S
39 Long primes    
39 MAC Vendor Lookup  
39 Multiple regression  
39 Order disjoint list items
39 Parsing/RPN to infix conversion
39 Permutations with repetitions  
39 Ray-casting algorithm  
39 Sum of divisors        
39 Tau number      
39 Totient function  
38 Bioinformatics/base count  
38 Break OO privacy      
38 Constrained genericity    
38 Convex hull
38 Cuban primes  
38 Display a linear combination
38 Floyd-Warshall algorithm
38 Idiomatically determine all the lowercase and uppercase letters      
38 LU decomposition
38 Lychrel numbers
38 Metered concurrency      
38 Minesweeper game    
38 Pathological floating point problems        
38 Pythagorean quadruples  
38 QR decomposition    
38 Ranking methods
38 Read a file character by character/UTF8    
38 Rosetta Code/Find bare lang tags          
38 Substitution cipher  
38 Sutherland-Hodgman polygon clipping  
38 Terminal control/Hiding the cursor      
38 Terminal control/Inverse video        
38 Vampire number
37 Abbreviations, easy  
37 Approximate equality  
37 Fibonacci word/fractal  
37 File extension is in extensions list
37 Find palindromic numbers in both binary and ternary bases  
37 Find the intersection of a line with a plane  
37 Function prototype      
37 Input/Output for lines of text  
37 Input/Output for pairs of numbers
37 Isqrt (integer square root) of X          
37 Loops/Wrong ranges      
37 MD4      
37 Maze solving  
37 Mertens function      
37 Metronome      
37 Object serialization  
37 Penney's game
37 Primality by Wilson's theorem      
37 Solve the no connection puzzle
37 Test integerness
36 Abbreviations, simple
36 Bitwise IO    
36 Egyptian fractions
36 Events          
36 Humble numbers
36 Largest number divisible by its digits    
36 Loops/With multiple ranges          
36 Numerical integration/Gauss-Legendre Quadrature  
36 Ordered partitions  
36 Pentagram      
36 Pinstripe/Display          
36 RIPEMD-160      
36 RSA code    
36 Safe primes and unsafe primes    
36 Square-free integers
36 Terminal control/Unicode output          
35 Arithmetic-geometric mean/Calculate Pi  
35 Bitmap/Bézier curves/Cubic        
35 Check output device is a terminal  
35 Entropy/Narcissist
35 Four is magic      
35 Multiline shebang        
35 Parametrized SQL statement        
35 Tau function        
35 Words containing "the" substring              
35 Yellowstone sequence
34 Conjugate transpose    
34 Determine if two triangles overlap      
34 Factorions    
34 Integer roots
34 Multi-dimensional array      
34 Mutex    
34 Old Russian measure of length    
34 Palindrome dates        
34 Pattern matching        
34 Pythagoras tree      
34 Set puzzle
34 Subset sum problem
34 Topic variable        
33 Bitcoin/address validation      
33 Cheryl's birthday  
33 Church numerals          
33 Continued fraction/Arithmetic/Construct from rational number
33 Decimal floating point number to binary  
33 Executable library      
33 Galton box animation  
33 Lah numbers  
33 Multiplicative order
33 Negative base numbers    
33 Parse command-line arguments      
33 Partition an integer x into n primes  
33 Poker hand analyser  
33 Resistor mesh  
33 Sequence: smallest number with exactly n divisors    
33 Solve a Hidato puzzle  
33 Sorting algorithms/Patience sort
33 Straddling checkerboard
33 Terminal control/Cursor movement            
33 Textonyms
33 Type detection      
33 Zumkeller numbers    
32 Bitmap/Bézier curves/Quadratic      
32 Check input device is a terminal      
32 Eban numbers    
32 Execute SNUSP    
32 Implicit type conversion    
32 Reflection/List properties      
32 Rosetta Code/Find unimplemented tasks        
32 Set of real numbers
32 Sorting algorithms/Cycle sort    
32 Strong and weak primes    
32 Use another language to call a function  
32 Write to Windows event log    
32 Zhang-Suen thinning algorithm  
31 Apply a digital filter (direct form II transposed)      
31 Arena storage pool        
31 Bacon cipher  
31 Bitmap/Histogram    
31 Chaocipher        
31 Check Machin-like formulas      
31 Checkpoint synchronization  
31 Compiler/lexical analyzer            
31 Dice game probabilities
31 Draw a rotating cube            
31 Extra primes        
31 Faulhaber's formula    
31 Faulhaber's triangle  
31 First class environments    
31 First power of 2 that has leading decimal digits of 12    
31 Gauss-Jordan matrix inversion      
31 Keyboard macros          
31 Largest proper divisor of n              
31 Length of an arc between two angles      
31 Mersenne primes        
31 Modular arithmetic    
31 Numeric error propagation  
31 Parallel brute force        
31 Perfect totient numbers    
31 Simple database    
31 URL parser        
31 Weird numbers  
31 Xiaolin Wu's line algorithm  
30 AVL tree          
30 Chat server      
30 Decision tables    
30 Deconvolution/1D    
30 Diversity prediction theorem      
30 FTP    
30 HTTPS/Authenticated          
30 Jacobi symbol      
30 Koch curve        
30 Mian-Chowla sequence        
30 Pell's equation    
30 Pragmatic directives          
30 Rosetta Code/Fix code tags    
30 Sequence: smallest number greater than previous term with exactly n divisors      
30 Sexy primes        
30 State name puzzle
30 Stream merge  
30 Terminal control/Preserve screen          
30 Update a configuration file    
30 Verify distribution uniformity/Chi-squared test    
30 Window creation/X11            
30 Word break problem    
30 Word wheel            
29 ABC words          
29 Burrows–Wheeler transform    
29 Coprimes            
29 Death Star        
29 Find first and last set bit of a long integer    
29 Formal power series      
29 Longest common suffix        
29 Memory layout of a data structure        
29 Numbers divisible by their individual digits, but not by the product of their digits.              
29 Product of divisors        
29 Smarandache prime-digital sequence      
29 Sum and product puzzle    
29 Sum of the digits of n is substring of n            
29 Super-d numbers    
29 Superellipse        
29 Table creation          
29 World Cup group stage  
28 Active Directory/Connect        
28 Chebyshev coefficients    
28 Chemical calculator      
28 Find largest left truncatable prime in a given base      
28 Honeycombs        
28 Law of cosines - triples      
28 Machine code              
28 Natural sorting      
28 Peano curve        
28 Perlin noise      
28 Polyspiral        
28 Primes which sum of digits is 25          
28 Ramsey's theorem      
28 Reflection/List methods        
28 Same fringe    
28 Successive prime differences    
28 The ISAAC Cipher      
28 Thiele's interpolation formula    
28 Tonelli-Shanks algorithm      
28 Unprimeable numbers    
27 Angles (geometric), normalization and conversion      
27 Birthday problem  
27 Card shuffles  
27 Create an object at a given address            
27 Cut a rectangle
27 Fairshare between two and more    
27 Finite state machine    
27 First perfect square in base n with n unique digits    
27 Go Fish    
27 Monads/Maybe monad      
27 Nautical bell  
27 Nice primes            
27 Nonoblock  
27 Numbers with equal rises and falls            
27 Palindromic gapful numbers      
27 Paraffins  
27 Range consolidation      
27 Safe addition    
27 Shift list elements to left by 3          
27 Sierpinski pentagon      
27 Solve a Holy Knight's tour  
27 Stirling numbers of the first kind  
27 Stirling numbers of the second kind  
27 Strange numbers          
26 A* search algorithm      
26 Bin given limits      
26 Color wheel          
26 Cousin primes                
26 Distributed programming          
26 Fermat numbers    
26 Fraction reduction  
26 Image convolution        
26 Kronecker product based fractals        
26 Magic squares of singly even order      
26 Minimum positive multiple in base 10 using only 0 and 1    
26 Möbius function        
26 N-smooth numbers    
26 Numbers with prime digits whose sum is 13        
26 Parse an IP Address    
26 Plasma effect          
26 Ramer-Douglas-Peucker line simplification      
26 Sequence of primorial primes      
26 Sorting algorithms/Cocktail sort with shifting bounds              
26 Strange plus numbers          
26 Teacup rim text        
25 Abelian sandpile model            
25 Alternade words            
25 Audio alarm        
25 Cipolla's algorithm          
25 Circular primes        
25 Elliptic curve arithmetic  
25 Find words with alternating vowels and consonants            
25 Fixed length records          
25 Function frequency            
25 Generate random chess position      
25 Hough transform    
25 Hunt the Wumpus          
25 Idiomatically determine all the characters that can be used for symbols        
25 Intersecting number wheels        
25 Linux CPU utilization    
25 List rooted trees  
25 Mayan numerals          
25 Next highest int from digits      
25 Pierpont primes        
25 Play recorded sounds              
25 RCRPG      
25 Random Latin squares      
25 Strange unique prime triplets              
25 Sum of first n cubes              
25 Total circles area  
25 Welch's t-test        
25 Yahoo! search interface        
24 Base58Check encoding      
24 De Bruijn sequences    
24 Elementary cellular automaton/Random Number Generator    
24 Find words which contains more than 3 e vowels              
24 K-means++ clustering        
24 Long literals, with continuations            
24 Make a backup file          
24 Mind boggling card trick          
24 Percolation/Mean run density      
24 Permutations/Rank of a permutation  
24 Playfair cipher    
24 Pseudo-random numbers/PCG32          
24 Shortest common supersequence  
24 Simulate input/Keyboard            
24 Superpermutation minimisation      
24 Video display modes                  
23 Active Directory/Search for a user        
23 Bioinformatics/Sequence mutation        
23 Common sorted list            
23 Create an object/Native demonstration    
23 Deming's Funnel    
23 Kolakoski sequence      
23 Lucky and even lucky numbers  
23 Main step of GOST 28147-89        
23 Markov chain text generator        
23 Monads/List monad        
23 Numbers which binary and ternary digit sum are prime              
23 Pseudo-random numbers/Xorshift star          
23 Record sound              
23 Reverse the gender of a string        
23 SOAP                
23 Solve a Hopido puzzle    
23 Spelling of ordinal numbers            
22 ASCII art diagram converter      
22 Addition chains        
22 Additive primes                
22 Assertions in design by contract    
22 Change e letters to i in words                
22 Commatizing numbers        
22 Data Encryption Standard            
22 Esthetic numbers          
22 Exponentiation with infix operators in (or operating on) the base            
22 Find duplicate files    
22 Increasing gaps between consecutive Niven numbers        
22 Kosaraju          
22 Levenshtein distance/Alignment      
22 Magnanimous numbers          
22 Mastermind              
22 Matrix chain multiplication            
22 Nested templated data        
22 Numeric separator syntax          
22 Padovan sequence          
22 Partition function P              
22 Pig the dice game/Player  
22 Self numbers            
22 Snake and Ladder      
22 Sokoban      
22 Solve a Numbrix puzzle    
22 UPC      
22 Vigenère cipher/Cryptanalysis      
22 Vogel's approximation method  
21 Bitcoin/public point to address        
21 Eertree      
21 Find prime numbers of the form n*n*n+2                
21 Joystick position                
21 K-d tree    
21 Median filter        
21 Native shebang          
21 Orbital elements          
21 Reflection/Get source        
21 Show the (decimal) value of a number of 1s appended with a 3, then squared                
21 Sum data type              
21 Sunflower fractal              
21 Window management              
20 15 puzzle solver                
20 Arithmetic coding/As a generalized change of radix          
20 Bilinear interpolation        
20 Changeable words              
20 Cistercian numerals        
20 Doomsday rule            
20 Elementary cellular automaton/Infinite length    
20 File size distribution        
20 Frobenius numbers            
20 Index finite lists of positive integers    
20 Merge and aggregate datasets                
20 Montgomery reduction        
20 N-body problem          
20 Odd words              
20 P-value correction          
20 Pancake numbers          
20 Polynomial synthetic division      
20 Rare numbers          
20 Sierpinski arrowhead curve            
20 Triplet of three numbers                
20 Ulam numbers            
19 Abelian sandpile model/Identity            
19 Code segment unload            
19 Color quantization          
19 Common list elements                
19 Compiler/code generator                
19 Draw pixel 2                  
19 Find words which first and last three letters are equals                
19 Just in time processing on a character stream      
19 Knuth's power tree        
19 Latin Squares in reduced form        
19 Line circle intersection      
19 Metallic ratios            
19 Monads/Writer monad              
19 Names to numbers      
19 Order by pair comparisons            
19 Perceptron            
19 Percolation/Site percolation        
19 Primes - allocate descendants to their ancestors          
19 Print debugging statement        
19 Readline interface        
19 SQL-based authentication            
19 Selective file copy            
19 Simulate input/Mouse              
19 Smallest square that begins with n              
19 Transportation problem        
19 Twin primes              
19 Untrusted environment        
19 Word search        
19 Zeckendorf arithmetic          
18 Base-16 representation                
18 Biorhythms            
18 Calkin-Wilf sequence            
18 Canonicalize CIDR          
18 Compiler/virtual machine interpreter                  
18 EKG sequence convergence          
18 Find URI in text            
18 Find if a point is within a triangle          
18 Find words which contains all the vowels                
18 Imaginary base numbers            
18 Most frequent k chars distance        
18 NYSIIS      
18 Nimber arithmetic              
18 Nonogram solver          
18 Percolation/Mean cluster density          
18 Separate the house number from the street name          
18 Sequence: nth number with exactly n divisors        
18 Solve triangle solitare puzzle        
17 Bitmap/Read an image through a pipe            
17 Chernick's Carmichael numbers              
17 Erdős-primes              
17 Find first missing positive                
17 Find prime n for that reversed n is also prime                
17 HTTPS/Client-authenticated            
17 Matrix digital rain              
17 Neighbour primes                  
17 Next special primes                
17 Padovan n-step number sequences                
17 Particle swarm optimization        
17 Percolation/Bond percolation        
17 Piprimes                
17 Prime words              
17 Proof            
17 Ramanujan's constant          
17 Retrieve and search chat history            
17 Self-hosting compiler                
17 Suffix tree          
17 Summarize primes                
17 Tarjan            
17 Terminal control/Positional read                
16 Aspect oriented programming              
16 Bitmap/PPM conversion through a pipe            
16 Compiler/syntax analyzer                  
16 Cyclotomic polynomial              
16 Free polyominoes enumeration        
16 Geometric algebra            
16 Getting the number of decimals            
16 Peaceful chess queen armies            
16 Prime triplets                  
16 Print itself                  
16 Pseudo-random numbers/Combined recursive generator MRG32k3a              
16 Pseudo-random numbers/Splitmix64                  
16 Singly-linked list/Element removal                  
16 Sleeping Beauty problem                
16 Snake              
16 Vibrating rectangles                
15 Banker's algorithm                
15 Compare sorting algorithms' performance            
15 Compiler/AST interpreter                
15 Coprime triplets                
15 Find words which contains most consonants                
15 Four is the number of letters in the ...            
15 Functional coverage tree              
15 Logistic curve fitting in epidemiology            
15 Numerical integration/Adaptive Simpson's method            
15 Odd squarefree semiprimes                
15 OpenWebNet password                
15 Practical numbers              
15 Primes with digits in nondecreasing order                  
15 Rendezvous            
15 Smallest power of 6 whose decimal expansion contains n              
15 Square root by hand              
15 Words from neighbour ones              
15 XML validation                  
14 Consecutive Primes With Ascending Or Descending Differences                
14 Continued fraction/Arithmetic/G(matrix ng, continued fraction n)        
14 Deconvolution/2D+              
14 Factorial base numbers indexing permutations of a collection                
14 Generalised floating point addition        
14 Gradient descent              
14 Jaro-Winkler distance                  
14 Palindromic primes                
14 Permutations with some identical elements              
14 SHA-256 Merkle tree                
14 Sierpinski curve              
14 Special factorials                
14 Topological sort/Extracted top item          
13 Checksumcolor                  
13 Pisano period            
13 Quadrat Special Primes                  
13 Simulated annealing            
13 Sine wave              
13 Substring primes                
13 Sylvester's sequence              
13 Unique characters                
13 Unique characters in each string                  
13 Wieferich primes              
12 Almkvist-Giullera formula for pi                  
12 Audio frequency generator                  
12 Canny edge detector              
12 Cubic Special Primes                  
12 Execute CopyPasta Language              
12 French Republican calendar                    
12 Greed              
12 Interactive help                
12 Launch rocket with countdown and acceleration in stdout              
12 Longest palindromic substrings                
12 Minimal steps down to 1                
12 Modified random distribution                  
12 Railway circuit              
12 Run as a daemon or service                
12 Safe mode                
12 Smallest numbers                  
12 Sorting algorithms/Tree sort on a linked list            
12 Suffixation of decimal numbers                
12 Tetris                  
12 Tree from nesting levels                
12 Two bullet roulette                
12 Untouchable numbers              
12 VList            
12 XXXX redacted                  
11 Air mass                  
11 Bioinformatics/Subsequence                  
11 Catmull–Clark subdivision surface              
11 Combinations with repetitions/Square digit chain              
11 Geohash                    
11 Harmonic series              
11 Minkowski question-mark function                  
11 One-time pad              
11 Pentomino tiling              
11 Resistance calculator                  
11 Sierpinski square curve              
11 Spoof game                
11 Text completion              
11 Tree datastructures              
11 Unit testing              
11 Using a speech engine to highlight words              
10 Colour pinstripe/Printer                
10 Curve that touches three points                
10 Decimal - Hexadecimal numbers                  
10 Display an outline as a nested table                  
10 External sort              
10 Faces from a mesh                
10 Graph colouring                
10 Non-transitive dice                    
10 Numerical and alphabetical suffixes                
10 Penrose tiling                
10 Pinstripe/Printer                
10 Powerful numbers              
10 Rosetta Code/Rank languages by number of users              
10 Starting a web browser                
10 Three word location                    
10 Time-based one-time password algorithm              
9 Continued fraction/Arithmetic/G(matrix ng, continued fraction n1, continued fraction n2)                
9 Count the coins/0-1                    
9 Elliptic Curve Digital Signature Algorithm                    
9 Fibonacci heap                  
9 Fibonacci matrix-exponentiation                
9 Hourglass puzzle                  
9 IPC via named pipe            
9 Longest substrings without repeating characters                
9 Morpion solitaire            
9 Parse EBNF              
9 Pseudorandom number generator image                  
9 Quoting constructs                
9 Range modifications                  
9 Resistance network calculator                  
9 Rosetta Code/Tasks without examples              
9 Sort an outline at every level                  
9 Special Divisors                  
9 Square Form Factorization                  
9 Text to HTML                
9 User defined pipe and redirection operators              
9 War card game                    
8 16 puzzle game                  
8 Bioinformatics/global alignment                    
8 Brace expansion using ranges                    
8 Compiler/Verifying syntax                    
8 Distinct Palindromes Within Decimal Numbers                  
8 Doubly-linked list/Element removal                    
8 Multidimensional Newton-Raphson method                  
8 OpenGL/Utah Teapot                  
8 Robots                
8 Word ladder                
7 Addition-chain exponentiation                
7 Home primes                    
7 I'm a software engineer, get me out of here                    
7 Mayan calendar                  
7 P-Adic numbers, basic                    
7 Price list behind API                    
7 Random sentence from book                    
7 Recursive descent parser generator                
7 Tamagotchi emulator                    
7 URL shortener                    
6 Audio overlap loop                  
6 Discrete Fourier transform                  
6 OpenGL pixel shader                
6 Remote agent/Agent logic                  
6 Remote agent/Simulation                  
6 Rosetta Code/Run examples                  
6 Smallest enclosing circle problem                    
6 Terminal control/Restricted width positional input/No wrapping                    
6 Terminal control/Restricted width positional input/With wrapping                    
6 Waveform analysis/Doh ray me                    
5 Black Box                  
5 Boids                  
5 Chess player                    
5 Hexapawn                    
5 Latin Squares in reduced form/Randomizing using Jacobson and Matthews’ Technique                    
5 P-Adic square roots                    
5 Process SMIL directives in XML data                  
5 Raster bars                    
5 Remote agent/Agent interface                  
5 Solve a Rubik's Cube                    
5 Strassen's algorithm                    
5 WiktionaryDumps to words                  
4 Generalised floating point multiplication                    
4 OLE automation                    
4 Solving coin problems                    
4 Unicode polynomial equation                    
4 Using the Meetup.com API                  
4 Weather routing                    
3 Blackjack strategy                    
3 Rosetta Code/List authors of task descriptions                    
3 Ukkonen’s suffix tree construction                    
3 Vidir                    
3 Waveform analysis/Top and tail                    
2 15 puzzle game in 3D                    
2 CLI-based maze-game                    
2 Compiler/Simple file inclusion pre processor                    
2 IRC gateway