Rosetta Code/Count examples/Full list/Tier 2

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Revision as of 20:50, 21 March 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 REXX          ⑫ Wren          ⑬ J             ⑭ Zkl           ⑮ Ruby         
    ⑯ C++           ⑰ Haskell       ⑱ Nim           ⑲ D             ⑳ Tcl          
As of 2021-03-21T20:21:27Z :: Tasks: 1099 :: Draft Tasks:244 :: Total Tasks: 1343 :: Total Examples: 74315
Count Task
482 Hello world/Text
321 99 bottles of beer
315 100 doors
312 FizzBuzz
286 Factorial
285 Fibonacci sequence
274 Comments
265 A+B
259 Empty program
238 Function definition
229 Loops/Infinite
225 Loops/While
223 Arrays
223 Reverse a string
220 Ackermann function  
206 Loops/For
200 Conditional structures
197 Greatest common divisor
197 Greatest element of a list
196 Arithmetic/Integer
187 Array concatenation
186 Repeat a string
185 Even or odd
185 Integer comparison
183 Averages/Arithmetic mean
181 Increment a numerical string
177 Hello world/Graphical
173 Copy a string
169 Boolean values
168 Loops/Downward for
168 Sieve of Eratosthenes
166 String concatenation
165 Apply a callback to an array
165 Character codes
164 Loops/Do-while
164 Loops/N plus one half
163 Hello world/Newline omission
163 Loops/For with a specified step
162 Array length
162 Loops/Foreach
162 String length
162 Sum and product of an array
161 Binary digits
160 Loops/Break
160 Palindrome detection
159 Integer sequence
159 Towers of Hanoi
158 Sum of a series
157 String case
155 Generic swap
155 Leap year
155 Rot-13
155 Tokenize a string
154 Dot product
154 Empty string
153 Logical operations
153 Sum of squares
152 Hailstone sequence
150 Filter
149 Associative array/Creation
148 Quine
147 Sort an integer array
147 Sorting algorithms/Bubble sort
145 Execute a system command
144 Caesar cipher
144 Factors of an integer
143 Guess the number
143 Roman numerals/Encode
142 Higher-order functions
142 Loop over multiple arrays simultaneously
142 System time
141 Remove duplicate elements
141 Sorting algorithms/Quicksort
140 Determine if a string is numeric
140 User input/Text
139 File input/output
137 Bitwise operations
137 Day of the week
136 Hello world/Standard error
136 Primality by trial division
135 Command-line arguments
135 Luhn test of credit card numbers
135 Read entire file
134 Create a file
133 Loops/Continue
133 Stack
132 Mutual recursion
131 Sleep
131 Substring
130 Generate lower case ASCII alphabet
130 Happy numbers
129 Least common multiple
129 Literals/String
129 Pascal's triangle
128 Check that file exists
128 Date format
128 Flatten a list
128 Zero to the zero power
127 ABC problem
124 Binary search
124 Compound data type
124 Program termination
123 Balanced brackets
123 Literals/Integer
122 Detect division by zero
122 Ethiopian multiplication
122 Function composition
122 Include a file  
122 Variables
121 Formatted numeric output
121 Loops/Nested
120 Knuth shuffle
120 N-queens problem
119 Associative array/Iteration
119 Averages/Root mean square
118 Mandelbrot set  
118 Null object
118 Read a file line by line
117 Count occurrences of a substring
117 Roman numerals/Decode
117 Search a list
117 Sorting algorithms/Insertion sort
116 Anagrams
116 Count in octal
116 Hash from two arrays
116 Multiplication tables
116 Real constants and functions
115 Case-sensitivity of identifiers
115 Delete a file
115 File size
115 Guess the number/With feedback
115 Identity matrix
114 Classes  
113 Align columns
113 Babbage problem
113 Environment variables
113 Input loop
113 Matrix multiplication
113 Matrix transposition
112 Averages/Median
112 Find limit of recursion
112 Pick random element
112 Random numbers
112 Rename a file
112 String matching
111 Hostname  
111 Letter frequency
111 Return multiple values
110 HTTP  
110 Pangram checker
110 Perfect numbers
109 Arithmetic/Complex
109 Haversine formula
108 Accumulator factory
108 Assertions
108 Conway's Game of Life
107 Catalan numbers
107 Infinity
107 Temperature conversion
106 Permutations
105 Averages/Pythagorean means
105 Horner's rule for polynomial evaluation
105 Levenshtein distance
105 Program name
105 Run-length encoding
105 Substring/Top and tail
105 Variadic function
104 Anonymous recursion
104 Arithmetic-geometric mean
104 Reverse words in a string
104 Strip a set of characters from a string
103 Evaluate binomial coefficients
103 Prime decomposition
103 Regular expressions
103 String append
102 Exceptions
102 Look-and-say sequence
102 Nth root
102 Sierpinski triangle
102 Strip whitespace from a string/Top and tail
102 Zig-zag matrix
101 Combinations
101 Queue/Definition
101 Sorting algorithms/Merge sort
101 String interpolation (included)
101 Trigonometric functions
100 Comma quibbling
100 Ordered words
99 Bulls and cows
99 Shell one-liner    
99 Short-circuit evaluation
99 Sorting algorithms/Selection sort
98 Middle three digits
97 24 game  
97 Call a function
97 Create a two-dimensional array at runtime
97 String prepend
97 Sum multiples of 3 and 5
96 Arbitrary-precision integers (included)
96 Interactive programming    
96 Power set
96 Range expansion
96 Range extraction
96 Y combinator
95 Sorting algorithms/Gnome sort
95 Sum digits of an integer
94 Collections
94 Enumerations
93 Digital root
93 Evolutionary algorithm
93 First-class functions
93 Time a function
93 Vector products
93 Walk a directory/Non-recursively  
92 Averages/Mode
92 Execute Brain****
92 Exponentiation operator
92 Inheritance/Single  
92 MD5
92 N'th
92 Sequence of non-squares
92 Sierpinski carpet
92 Sorting algorithms/Cocktail sort
92 The Twelve Days of Christmas
91 Create an HTML table
91 One-dimensional cellular automata
90 Cumulative standard deviation
90 JSON  
90 Random number generator (included)
90 Sort using a custom comparator
89 Averages/Simple moving average
89 Dragon curve
89 Forward difference
89 Sorting algorithms/Bogosort
88 Entropy
88 Hello world/Newbie
88 Langton's ant
88 Monty Hall problem
88 String comparison
88 Symmetric difference
87 Gray code
87 Greatest subsequential sum
87 Hamming numbers
87 Josephus problem
86 CSV data manipulation
86 Five weekends
86 Harshad or Niven series
86 Menu
86 Price fraction
85 Abstract type
85 Abundant, deficient and perfect number classifications
85 Compare a list of strings
85 Number names
85 Tree traversal
84 CSV to HTML translation
84 Map range
84 Sorting algorithms/Heapsort
83 Catamorphism
83 Last Friday of each month
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 Hofstadter Q sequence
82 Non-decimal radices/Convert
82 SEDOLs
82 Set
81 Count in factors
81 Monte Carlo methods
81 Number reversal game
81 Terminal control/Clear the screen  
80 Amicable pairs
80 Box the compass
80 Calculating the value of e
80 Introspection
80 Literals/Floating point  
80 URL decoding
79 Count the coins
79 Hello world/Line printer    
79 Long multiplication
79 Roots of unity
79 Singly-linked list/Traversal
79 Sorting algorithms/Shell sort
79 Spiral matrix
79 Terminal control/Ringing the terminal bell
79 Web scraping    
78 Bitmap
78 Concurrent computing  
78 Date manipulation
78 Find common directory path
78 Find the last Sunday of each month
78 Order two numerical lists
78 Playing cards
78 Read a specific line from a file
78 Show the epoch
78 Top rank per group
78 XML/Input
77 Address of a variable      
77 CRC-32
77 Floyd's triangle
77 Jensen's Device
77 Knapsack problem/0-1
77 Linear congruential generator
77 Multifactorial
77 Operator precedence
77 Proper divisors
77 Sockets    
77 Sorting algorithms/Counting sort
77 Word wrap
76 Call an object method    
76 Find the missing permutation
76 Here document
76 Keyboard input/Obtain a Y or N response    
76 Pythagorean triples  
76 Strip comments from a string
76 URL encoding
75 Almost prime
75 Dynamic variable names    
75 Kaprekar numbers
75 Lucas-Lehmer test
75 Man or boy test
75 Modular inverse
75 Munchausen numbers  
75 Repeat  
75 Split a character string based on change of character
74 Anagrams/Deranged anagrams
74 Averages/Mean angle
74 Calendar
74 List comprehensions
74 Non-decimal radices/Output
74 Parsing/RPN calculator algorithm
74 Phrase reversals
74 Read a configuration file
74 SHA-1  
74 Semordnilap
74 Sorting algorithms/Comb sort
74 Soundex    
73 Equilibrium index
73 Fibonacci n-step number sequences
73 Gamma function  
73 Hello world/Web server  
73 Population count
73 Unicode variable names  
72 Animation    
72 Empty directory
72 Exceptions/Catch an exception thrown in a nested call
72 Execute HQ9+
72 Multiple distinct objects
72 Pi  
72 SHA-256  
72 Singly-linked list/Element definition
72 Special characters  
72 Sudoku
72 Write entire file
71 AKS test for primes
71 Convert seconds to compound duration
71 Longest common subsequence
71 Show ASCII table
71 Take notes on the command line  
70 Bitmap/Bresenham's line algorithm
70 Call a foreign-language function
70 Currying
70 Enforced immutability
70 Euler's sum of powers conjecture
70 Largest int from concatenated ints
70 Polymorphism  
70 Rock-paper-scissors      
70 Sort disjoint sublist
70 Vigenère cipher
70 Zeckendorf number representation
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 Four bit adder
69 Guess the number/With feedback (player)
69 IBAN
69 Quaternion type  
69 Self-describing numbers
69 Sorting algorithms/Stooge sort
69 Stair-climbing puzzle
69 Write float arrays to a text file
68 15 puzzle game      
68 Euler method
68 Extend your language    
68 Horizontal sundial calculations  
68 Jump anywhere
68 Maze generation  
68 Numerical integration
68 Old lady swallowed a fly
68 Priority queue
68 Trabb Pardo–Knuth algorithm
67 Benford's law
67 Fork  
67 Fractal tree    
67 Magic squares of odd order
67 Nested function
67 Sorting algorithms/Pancake sort
67 Text processing/Max licenses in use
66 Arithmetic/Rational
66 Chinese remainder theorem
66 Fast Fourier transform
66 Named parameters    
66 One of n lines in a file
66 Pernicious numbers
66 Runtime evaluation      
66 Sort stability
66 Special variables    
65 Amb    
65 Documentation    
65 General FizzBuzz
65 HTTPS      
65 Morse code    
65 Narcissistic decimal number
65 Optional parameters
65 Remove lines from a file  
65 Roots of a function
65 Strip control codes and extended characters from a string
65 Unix/ls
65 Variable size/Get
64 Barnsley fern      
64 Continued fraction
64 Hofstadter-Conway $10,000 sequence
64 Inheritance/Multiple    
64 Sequence of primes by trial division
64 XML/Output
63 Anti-primes
63 Memory allocation
63 Reduced row echelon form
63 Roots of a quadratic function  
63 Singly-linked list/Element insertion
63 Write language name in 3D ASCII
62 Animate a pendulum      
62 Cholesky decomposition
62 Circles of given radius through two points
62 Exponentiation order
62 Factors of a Mersenne number
62 Globally replace text in several files  
62 Mouse position            
62 Non-decimal radices/Input
62 Probabilistic choice
62 Rep-string
62 Runge-Kutta method
62 Semiprime
62 Thue-Morse  
62 Undefined values    
61 Angle difference between two bearings
61 Averages/Mean time of day
61 Department numbers
61 Get system command output
61 Modular exponentiation
61 Plot coordinate pairs    
61 Sorting algorithms/Sleep sort  
61 Van der Corput sequence  
60 Arithmetic evaluation  
60 Best shuffle
60 Binary strings
60 Knapsack problem/Continuous
60 Partial function application
60 Test a function  
60 Tic-tac-toe    
59 24 game/Solve  
59 9 billion names of God the integer
59 Draw a clock    
59 Dutch national flag problem
59 Emirp primes
59 Generator/Exponential
59 Host introspection      
59 Huffman coding
59 Jewels and stones
59 Knapsack problem/Unbounded  
59 Sort three variables  
59 Unicode strings  
59 Word frequency  
58 Bitmap/Write a PPM file  
58 Brownian tree  
58 Compile-time calculation  
58 Damm algorithm  
58 Hash join
58 Knight's tour
58 Miller–Rabin primality test  
58 Odd word problem
58 Truncatable primes
58 User input/Graphical        
58 Yin and yang    
57 2048    
57 4-rings or 4-squares puzzle
57 Add a variable to a class instance at runtime        
57 Deal cards for FreeCell
57 Delegates    
57 Draw a cuboid
57 I before E except after C
57 Integer overflow
57 JortSort
57 Left factorials
57 Leonardo numbers  
57 Matrix-exponentiation operator    
57 Random number generator (device)  
57 Scope modifiers    
57 Sorting algorithms/Bead sort
57 Sorting algorithms/Permutation sort
57 Two sum  
56 Cartesian product of two or more lists
56 DNS query  
56 Dinesman's multiple-dwelling problem
56 Discordian date
56 Doubly-linked list/Element definition
56 Extract file extension  
56 Fibonacci word
56 LZW compression
56 Longest common prefix  
56 Ludic numbers
56 Mad Libs
56 Multisplit
56 Rosetta Code/Rank languages by popularity  
56 Singleton    
56 Stem-and-leaf plot  
56 Stern-Brocot sequence  
56 Terminal control/Coloured text  
56 Terminal control/Display an extended character
56 Truncate a file  
55 100 prisoners  
55 Base64 encode data
55 Define a primitive data type    
55 Extreme floating point values    
55 Forest fire    
55 Grayscale image    
55 Long year    
55 Modulinos    
55 Munching squares
55 Stack traces    
55 Topological sort  
54 CUSIP
54 Draw a pixel        
54 Quickselect algorithm
54 Runtime evaluation/In an environment        
54 Sierpinski triangle/Graphical    
54 Subleq  
54 Synchronous concurrency  
54 Terminal control/Cursor positioning    
54 XML/XPath      
53 Abundant odd numbers  
53 Bernoulli numbers
53 Convert decimal number to rational  
53 Handle a signal  
53 Maximum triangle path sum
53 Non-continuous subsequences
53 Pointers and references  
53 Send email      
53 Ternary logic  
53 Unbias a random generator
53 XML/DOM serialization      
52 First-class functions/Use numbers analogously  
52 Inverted syntax
52 Iterated digits squaring
52 Keyboard input/Keypress check      
52 Longest increasing subsequence
52 Loops/Increment loop index within loop body  
52 Statistics/Basic
52 Text processing/2
51 Call a function in a shared library    
51 Determine if a string has all the same characters
51 Dining philosophers  
51 FASTA format  
51 Farey sequence
51 Gaussian elimination  
51 Longest common substring  
51 Magic 8-ball  
51 Move-to-front algorithm
51 Polynomial regression
51 Seven-sided dice from five-sided dice  
51 Smith numbers
51 Strip block comments
51 Wireworld    
50 Archimedean spiral  
50 Attractive numbers
50 Base64 decode data    
50 Chinese zodiac  
50 Colour bars/Display    
50 Determine if a string is collapsible
50 Dijkstra's algorithm  
50 GUI component interaction        
50 Heronian triangles
50 Holidays related to Easter      
50 Make directory path  
50 Perfect shuffle
50 Pig the dice game
50 Respond to an unknown method call      
50 Sattolo cycle  
50 Universal Turing machine  
50 Validate International Securities Identification Number  
50 Vector  
49 Find the intersection of two lines  
49 Fractran  
49 Last letter-first letter
49 Pascal matrix generation
49 Rate counter  
49 Shoelace formula for polygonal area  
49 Text processing/1  
48 Chaos game        
48 Copy stdin to stdout      
48 Determinant and permanent
48 Doubly-linked list/Element insertion
48 Doubly-linked list/Traversal
48 Extensible prime generator
48 Greyscale bars/Display        
48 Jaro distance
48 Kernighans large earthquake problem
48 Metaprogramming  
48 Naming conventions    
48 Polymorphic copy    
48 RPG attributes generator    
48 Search a list of records    
48 Square but not cube  
48 Tokenize a string with escaping
48 Zebra puzzle    
47 Append a record to the end of a text file
47 Echo server        
47 Execute a Markov algorithm  
47 History variables  
47 ISBN13 check digit  
47 Kronecker product  
47 Longest string challenge    
47 Password generator      
47 Polynomial long division  
47 Stable marriage problem  
46 Average loop length
46 Bitmap/Flood fill  
46 Determine if only one instance is running      
46 Egyptian division  
46 Narcissist  
46 Set consolidation  
46 Sort numbers lexicographically      
46 Water collected between towers
45 Active object      
45 Associative array/Merging    
45 Determine if a string has all unique characters
45 Hofstadter Figure-Figure sequences
45 Image noise  
45 McNuggets problem      
45 OpenGL        
45 Parsing/Shunting-yard algorithm
45 Send an unknown method call          
45 Sorting algorithms/Radix sort
45 Verify distribution uniformity/Naive  
45 Visualize a tree
44 Bulls and cows/Player
44 Carmichael 3 strong pseudoprimes
44 Doubly-linked list/Definition
44 Element-wise operations
44 Elementary cellular automaton  
44 GUI/Maximum window dimensions          
44 Generate Chess960 starting position
44 Rosetta Code/Count examples      
44 Sparkline in unicode
44 Ulam spiral (for primes)  
43 Atomic updates      
43 Bitmap/Read a PPM file    
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 Spinning rod animation/Text          
43 Subtractive generator
42 Aliquot sequence classifications
42 Calendar - for "REAL" programmers    
42 Cantor set  
42 Currency    
42 Digital root/Multiplicative digital root
42 Nim game        
42 Permutations/Derangements  
42 Secure temporary file          
42 Sum to 100
42 Terminal control/Dimensions        
42 Truth table    
42 Twelve statements  
42 Van Eck sequence
42 Voronoi diagram  
41 Balanced ternary  
41 Bitmap/Midpoint circle algorithm    
41 Combinations and permutations  
41 Deepcopy        
41 Fusc sequence
41 Gapful numbers
41 Hilbert curve    
41 Parallel calculations      
41 Pascal's triangle/Puzzle
41 Problem of Apollonius  
41 Remove vowels from a string        
41 S-expressions    
41 Sorting Algorithms/Circle Sort  
41 Sorting algorithms/Strand sort
41 Speech synthesis            
41 Start from a main routine      
41 Table creation/Postal addresses      
41 Taxicab numbers  
41 Text between  
41 Variable size/Set  
40 Casting out nines
40 Color of a screen pixel          
40 Euler's identity  
40 Flipping bits game    
40 GUI enabling/disabling of controls          
40 Inverted index    
40 Primorial numbers  
40 Summarize and say sequence  
40 Variable-length quantity
39 Abbreviations, automatic
39 Brace expansion
39 Colour pinstripe/Display          
39 Cramer's rule
39 Create a file on magnetic tape    
39 Fivenum  
39 Julia set      
39 Knuth's algorithm S
39 Magic squares of doubly even order  
39 Musical scale            
39 Order disjoint list items
39 Parametric polymorphism      
39 Parsing/RPN to infix conversion
39 Permutation test
39 Permutations by swapping
39 Permutations with repetitions    
39 Prime conspiracy  
39 The Name Game    
39 Topswops
39 UTF-8 encode and decode      
38 Brazilian numbers  
38 Break OO privacy    
38 Constrained genericity    
38 Cuban primes  
38 Days between dates    
38 Feigenbaum constant calculation  
38 Kahan summation    
38 LU decomposition
38 MAC Vendor Lookup  
38 Metered concurrency      
38 Pythagorean quadruples  
38 Recaman's sequence    
38 Sailors, coconuts and a monkey problem  
38 Scope/Function names and labels      
38 Sort a list of object identifiers    
38 Statistics/Normal distribution    
37 Abbreviations, easy  
37 Bell numbers  
37 Chowla numbers  
37 File extension is in extensions list
37 Find palindromic numbers in both binary and ternary bases  
37 Function prototype    
37 Input/Output for lines of text    
37 Input/Output for pairs of numbers  
37 Long primes    
37 Loops/Wrong ranges      
37 Lychrel numbers
37 MD4      
37 Metronome      
37 Object serialization  
37 Pathological floating point problems        
37 QR decomposition        
37 Ray-casting algorithm      
37 Read a file character by character/UTF8      
37 Terminal control/Hiding the cursor    
37 Terminal control/Inverse video      
37 Vampire number  
36 21 game          
36 Abbreviations, simple
36 Bitwise IO  
36 Convex hull
36 Determine if a string is squeezable
36 Egyptian fractions
36 Events        
36 Fibonacci word/fractal    
36 Find the intersection of a line with a plane  
36 Floyd-Warshall algorithm  
36 Humble numbers
36 Idiomatically determine all the lowercase and uppercase letters      
36 Largest number divisible by its digits  
36 Loops/With multiple ranges        
36 Maze solving    
36 Minesweeper game      
36 Numerical integration/Gauss-Legendre Quadrature  
36 Penney's game
36 Pinstripe/Display          
36 RIPEMD-160      
36 Ranking methods    
36 Solve the no connection puzzle  
36 Substitution cipher    
36 Terminal control/Unicode output          
35 Approximate equality  
35 Arithmetic-geometric mean/Calculate Pi  
35 Bitmap/Bézier curves/Cubic      
35 Check output device is a terminal  
35 Display a linear combination  
35 Isqrt (integer square root) of X        
35 Multiline shebang          
35 Multiple regression      
35 Ordered partitions
35 Pentagram      
35 Square-free integers  
35 Sutherland-Hodgman polygon clipping      
35 Test integerness  
34 Conjugate transpose  
34 Entropy/Narcissist
34 Parametrized SQL statement          
34 Pattern matching      
34 RSA code      
34 Totient function  
33 Cheryl's birthday  
33 Continued fraction/Arithmetic/Construct from rational number
33 Executable library      
33 Factorions    
33 Integer roots  
33 Mertens function    
33 Mutex      
33 Negative base numbers    
33 Old Russian measure of length    
33 Parse command-line arguments    
33 Partition an integer x into n primes  
33 Poker hand analyser  
33 Primality by Wilson's theorem    
33 Rosetta Code/Find bare lang tags            
33 Solve a Hidato puzzle  
33 Subset sum problem  
33 Topic variable        
32 Bitcoin/address validation        
32 Bitmap/Bézier curves/Quadratic    
32 Check input device is a terminal    
32 Church numerals          
32 Decimal floating point number to binary    
32 Determine if two triangles overlap        
32 Eban numbers  
32 Execute SNUSP    
32 Four is magic      
32 Galton box animation    
32 Lah numbers
32 Multi-dimensional array      
32 Multiplicative order
32 Pythagoras tree          
32 Resistor mesh    
32 Safe primes and unsafe primes    
32 Set puzzle  
32 Sorting algorithms/Patience sort
32 Straddling checkerboard  
32 Type detection        
31 Apply a digital filter (direct form II transposed)        
31 Bioinformatics/base count        
31 Bitmap/Histogram      
31 Cycle detection    
31 Faulhaber's formula    
31 Faulhaber's triangle  
31 First class environments  
31 Keyboard macros            
31 Numeric error propagation  
31 Palindrome dates      
31 Perfect totient numbers    
31 Reflection/List properties      
31 Rosetta Code/Find unimplemented tasks        
31 Set of real numbers  
31 Terminal control/Cursor movement            
31 Textonyms  
31 URL parser          
31 Use another language to call a function    
31 Write to Windows event log        
30 Chaocipher      
30 Check Machin-like formulas        
30 Checkpoint synchronization    
30 Deconvolution/1D    
30 Dice game probabilities
30 Draw a rotating cube              
30 FTP      
30 HTTPS/Authenticated          
30 Implicit type conversion        
30 Koch curve      
30 Mersenne primes        
30 Mian-Chowla sequence      
30 Modular arithmetic    
30 Parallel brute force          
30 Pragmatic directives        
30 Sequence: smallest number with exactly n divisors  
30 Simple database        
30 Terminal control/Preserve screen          
30 Window creation/X11              
30 Xiaolin Wu's line algorithm      
30 Zhang-Suen thinning algorithm    
29 Arena storage pool        
29 Bacon cipher    
29 Chat server        
29 Death Star          
29 Decision tables      
29 Diversity prediction theorem      
29 Gauss-Jordan matrix inversion      
29 Jacobi symbol    
29 Memory layout of a data structure      
29 Rosetta Code/Fix code tags        
29 Sequence: smallest number greater than previous term with exactly n divisors    
29 Stream merge    
29 Update a configuration file      
29 Word break problem      
28 AVL tree          
28 Chemical calculator      
28 Compiler/lexical analyzer              
28 Extra primes          
28 Find first and last set bit of a long integer      
28 Find largest left truncatable prime in a given base      
28 First power of 2 that has leading decimal digits of 12    
28 Formal power series        
28 Honeycombs          
28 Peano curve        
28 Perlin noise      
28 Polyspiral          
28 Ramsey's theorem        
28 Smarandache prime-digital sequence      
28 Sorting algorithms/Cycle sort    
28 State name puzzle  
28 Strong and weak primes    
28 Sum and product puzzle      
28 Super-d numbers    
28 Verify distribution uniformity/Chi-squared test      
27 Active Directory/Connect            
27 Angles (geometric), normalization and conversion      
27 Burrows–Wheeler transform  
27 Chebyshev coefficients      
27 Create an object at a given address            
27 Cut a rectangle
27 Go Fish      
27 Law of cosines - triples    
27 Machine code              
27 Natural sorting      
27 Nautical bell    
27 Palindromic gapful numbers    
27 Paraffins  
27 Reflection/List methods        
27 Safe addition    
27 Sexy primes        
27 Superellipse          
27 The ISAAC Cipher        
27 Thiele's interpolation formula    
27 Weird numbers    
27 World Cup group stage    
27 Yellowstone sequence  
26 Birthday problem    
26 Card shuffles    
26 Distributed programming          
26 Fairshare between two and more  
26 First perfect square in base n with n unique digits    
26 Image convolution          
26 Kronecker product based fractals      
26 N-smooth numbers  
26 Nonoblock  
26 Numbers with prime digits whose sum is 13        
26 Ramer-Douglas-Peucker line simplification      
26 Range consolidation        
26 Same fringe        
26 Solve a Holy Knight's tour    
26 Table creation            
26 Zumkeller numbers        
25 A* search algorithm          
25 Abelian sandpile model          
25 Color wheel          
25 Elliptic curve arithmetic  
25 Fermat numbers    
25 Fraction reduction    
25 Generate random chess position    
25 Idiomatically determine all the characters that can be used for symbols        
25 Intersecting number wheels      
25 Length of an arc between two angles        
25 Magic squares of singly even order    
25 Minimum positive multiple in base 10 using only 0 and 1    
25 Möbius function        
25 Parse an IP Address    
25 Pell's equation    
25 Pierpont primes      
25 Plasma effect            
25 Play recorded sounds            
25 RCRPG        
25 Sequence of primorial primes        
25 Stirling numbers of the first kind  
25 Stirling numbers of the second kind  
25 Successive prime differences    
25 Tau number            
25 Tonelli-Shanks algorithm        
25 Welch's t-test          
25 Yahoo! search interface            
24 Audio alarm            
24 Cipolla's algorithm            
24 Circular primes      
24 Function frequency              
24 Hough transform      
24 K-means++ clustering          
24 List rooted trees  
24 Mind boggling card trick      
24 Monads/Maybe monad      
24 Percolation/Mean run density    
24 Permutations/Rank of a permutation  
24 Sierpinski pentagon          
24 Simulate input/Keyboard              
24 Tau function            
24 Unprimeable numbers      
23 Base58Check encoding        
23 Create an object/Native demonstration    
23 Deming's Funnel    
23 Elementary cellular automaton/Random Number Generator  
23 Finite state machine          
23 Fixed length records          
23 Hunt the Wumpus              
23 Kolakoski sequence    
23 Linux CPU utilization        
23 Longest common suffix            
23 Lucky and even lucky numbers
23 Main step of GOST 28147-89      
23 Make a backup file              
23 Markov chain text generator          
23 Mayan numerals        
23 Next highest int from digits    
23 Numbers with equal rises and falls              
23 Playfair cipher  
23 Record sound              
23 Reverse the gender of a string          
23 SOAP                
23 Strange plus numbers            
23 Sum of divisors          
23 Superpermutation minimisation      
23 Teacup rim text        
23 Total circles area  
23 Video display modes                  
23 Words containing "the" substring                
22 Active Directory/Search for a user          
22 Alternade words              
22 Commatizing numbers        
22 Find duplicate files      
22 Find words with alternating vowels and consonants          
22 Increasing gaps between consecutive Niven numbers      
22 Magnanimous numbers          
22 Matrix chain multiplication            
22 Pig the dice game/Player    
22 Pseudo-random numbers/PCG32          
22 Shortest common supersequence      
22 Snake and Ladder          
22 Solve a Hopido puzzle      
22 Sorting algorithms/Cocktail sort with shifting bounds            
22 Spelling of ordinal numbers            
21 ASCII art diagram converter        
21 Data Encryption Standard            
21 De Bruijn sequences      
21 Esthetic numbers          
21 Joystick position                
21 Kosaraju          
21 Long literals, with continuations          
21 Mastermind            
21 Median filter        
21 Monads/List monad        
21 Native shebang          
21 Numeric separator syntax            
21 Orbital elements          
21 Random Latin squares          
21 Reflection/Get source        
21 Sokoban        
21 Solve a Numbrix puzzle      
21 Window management                
21 Word wheel          
20 Addition chains            
20 Assertions in design by contract        
20 Bioinformatics/Sequence mutation        
20 Bitcoin/public point to address        
20 Cistercian numerals      
20 Eertree        
20 Find words which contains more than 3 e vowels              
20 Index finite lists of positive integers    
20 Levenshtein distance/Alignment        
20 Padovan sequence        
20 Pseudo-random numbers/Xorshift star          
20 Strange unique prime triplets              
20 Sum data type            
20 UPC      
20 Vigenère cipher/Cryptanalysis        
20 Vogel's approximation method    
19 Abelian sandpile model/Identity        
19 Bilinear interpolation            
19 Code segment unload              
19 Color quantization          
19 Elementary cellular automaton/Infinite length  
19 K-d tree      
19 Knuth's power tree        
19 Line circle intersection      
19 Montgomery reduction          
19 N-body problem            
19 Names to numbers      
19 P-value correction        
19 Pancake numbers        
19 Perceptron                
19 Percolation/Site percolation      
19 Primes - allocate descendants to their ancestors          
19 Print debugging statement          
19 Readline interface          
19 Selective file copy              
19 Self numbers                
19 Shift list elements to left by 3            
19 Sierpinski arrowhead curve          
19 Simulate input/Mouse                  
19 Sunflower fractal              
19 Untrusted environment        
18 15 puzzle solver                
18 ABC words              
18 Arithmetic coding/As a generalized change of radix            
18 Bin given limits            
18 Canonicalize CIDR        
18 Compiler/code generator                
18 Draw pixel 2                  
18 EKG sequence convergence        
18 File size distribution          
18 Find URI in text              
18 Imaginary base numbers          
18 Metallic ratios          
18 Monads/Writer monad          
18 Nimber arithmetic            
18 Odd words              
18 Product of divisors            
18 SQL-based authentication                
18 Solve triangle solitare puzzle          
18 Transportation problem            
18 Twin primes              
18 Ulam numbers            
17 Biorhythms        
17 Bitmap/Read an image through a pipe            
17 Change e letters to i in words              
17 Compiler/virtual machine interpreter                
17 Exponentiation with infix operators in (or operating on) the base            
17 Find if a point is within a triangle          
17 Just in time processing on a character stream          
17 Matrix digital rain              
17 Most frequent k chars distance          
17 NYSIIS        
17 Nested templated data            
17 Nonogram solver            
17 Percolation/Bond percolation      
17 Percolation/Mean cluster density        
17 Polynomial synthetic division            
17 Prime words            
17 Proof            
17 Separate the house number from the street name          
17 Strange numbers              
17 Zeckendorf arithmetic              
16 Aspect oriented programming                
16 Bitmap/PPM conversion through a pipe            
16 Calkin-Wilf sequence          
16 Changeable words              
16 Chernick's Carmichael numbers            
16 Free polyominoes enumeration            
16 HTTPS/Client-authenticated              
16 Latin Squares in reduced form          
16 Particle swarm optimization            
16 Partition function P            
16 Peaceful chess queen armies          
16 Pseudo-random numbers/Splitmix64                
16 Rare numbers          
16 Retrieve and search chat history              
16 Self-hosting compiler              
16 Snake                
16 Tarjan            
16 Terminal control/Positional read                  
16 Vibrating rectangles                  
16 Word search            
15 Compiler/syntax analyzer                  
15 Cyclotomic polynomial              
15 Find words which contains all the vowels              
15 Four is the number of letters in the ...          
15 Functional coverage tree            
15 Geometric algebra              
15 Getting the number of decimals              
15 Merge and aggregate datasets            
15 Nice primes            
15 Numerical integration/Adaptive Simpson's method            
15 OpenWebNet password              
15 Rendezvous              
15 Sequence: nth number with exactly n divisors            
15 Singly-linked list/Element removal                  
15 Square root by hand              
15 Suffix tree              
15 Words from neighbour ones              
14 Compare sorting algorithms' performance          
14 Compiler/AST interpreter                
14 Find words which first and last three letters are equals              
14 Generalised floating point addition          
14 Gradient descent              
14 Jaro-Winkler distance                
14 Logistic curve fitting in epidemiology            
14 Padovan n-step number sequences              
14 Permutations with some identical elements            
14 Ramanujan's constant            
14 Topological sort/Extracted top item            
14 XML validation                    
13 Banker's algorithm                
13 Deconvolution/2D+            
13 Factorial base numbers indexing permutations of a collection              
13 Find words which contains most consonants              
13 Pisano period            
13 SHA-256 Merkle tree                
13 Sine wave                
12 Additive primes              
12 Canny edge detector            
12 Common sorted list                
12 Continued fraction/Arithmetic/G(matrix ng, continued fraction n)          
12 Find prime numbers of the form n*n*n+2                
12 Greed                
12 Interactive help                
12 Longest palindromic substrings              
12 Minimal steps down to 1              
12 Print itself                
12 Safe mode              
12 Sierpinski curve                
12 Simulated annealing            
12 Sorting algorithms/Tree sort on a linked list              
12 Tetris                    
12 Two bullet roulette              
12 VList            
12 XXXX redacted                
11 Almkvist-Giullera formula for pi                
11 Audio frequency generator                  
11 Checksumcolor                  
11 Common list elements                
11 Find first missing positive                
11 Geohash                  
11 Launch rocket with countdown and acceleration in stdout              
11 Minkowski question-mark function              
11 One-time pad                
11 Pentomino tiling                  
11 Pseudo-random numbers/Combined recursive generator MRG32k3a                  
11 Railway circuit                  
11 Resistance calculator              
11 Run as a daemon or service                  
11 Sierpinski square curve                
11 Text completion              
11 Tree from nesting levels              
11 Unit testing              
11 Untouchable numbers            
11 Using a speech engine to highlight words              
10 Catmull–Clark subdivision surface            
10 Colour pinstripe/Printer                
10 Combinations with repetitions/Square digit chain            
10 Execute CopyPasta Language                
10 External sort              
10 Faces from a mesh            
10 Modified random distribution              
10 Non-transitive dice                
10 Penrose tiling                    
10 Pinstripe/Printer                
10 Powerful numbers              
10 Spoof game                
10 Three word location                  
10 Time-based one-time password algorithm                
9 Cousin primes                
9 Curve that touches three points              
9 Display an outline as a nested table                
9 Fibonacci matrix-exponentiation                  
9 French Republican calendar                    
9 Graph colouring                
9 Hourglass puzzle                
9 IPC via named pipe              
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 Starting a web browser                  
9 Suffixation of decimal numbers                
9 Text to HTML                
9 Tree datastructures              
9 User defined pipe and redirection operators                
9 War card game                
8 Count the coins/0-1                  
8 Elliptic Curve Digital Signature Algorithm                  
8 Find prime n for that reversed n is also prime              
8 Multidimensional Newton-Raphson method                
8 Numerical and alphabetical suffixes                
8 Primes which sum of digits is 25                
8 Rosetta Code/Rank languages by number of users                
8 Sort an outline at every level                
7 16 puzzle game                  
7 Brace expansion using ranges                  
7 Compiler/Verifying syntax                    
7 Erdős-primes              
7 Fibonacci heap                  
7 Mayan calendar                
7 OpenGL/Utah Teapot                  
7 P-Adic numbers, basic                
7 Recursive descent parser generator                
7 Robots                  
7 Smallest square that begins with n                
7 Special factorials                
7 Square Form Factorization                
7 URL shortener                    
6 Bioinformatics/Subsequence                
6 Bioinformatics/global alignment                  
6 Continued fraction/Arithmetic/G(matrix ng, continued fraction n1, continued fraction n2)                
6 Doubly-linked list/Element removal                  
6 I'm a software engineer, get me out of here                    
6 OpenGL pixel shader                  
6 Price list behind API                  
6 Random sentence from book                  
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                    
5 Addition-chain exponentiation                  
5 Audio overlap loop                  
5 Black Box                  
5 Boids                    
5 Chess player                    
5 Hexapawn                    
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 Tamagotchi emulator                    
5 Waveform analysis/Doh ray me                    
4 Generalised floating point multiplication                    
4 Latin Squares in reduced form/Randomizing using Jacobson and Matthews’ Technique                    
4 OLE automation                    
4 Unicode polynomial equation                  
4 Using the Meetup.com API                    
4 Weather routing                  
4 WiktionaryDumps to words                    
3 Rosetta Code/List authors of task descriptions                    
3 Solving coin problems                    
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 IRC gateway                  
1 Blackjack strategy