Rosetta Code/Count examples/Full list/Tier 2

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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 Zkl           ⑬ J             ⑭ Ruby          ⑮ Haskell      
    ⑯ C++           ⑰ D             ⑱ Tcl           ⑲ Scala         ⑳ C_sharp      
As of 2020-12-31T16:48:06Z :: Tasks: 1082 :: Draft Tasks:225 :: Total Tasks: 1307 :: Total Examples: 71988
Count Task
477 Hello world/Text
316 99 bottles of beer
310 100 doors
308 FizzBuzz
282 Factorial
281 Fibonacci sequence
271 Comments
260 A+B
255 Empty program
236 Function definition
226 Loops/Infinite
222 Loops/While
222 Reverse a string
221 Arrays
216 Ackermann function  
205 Loops/For
200 Conditional structures
196 Greatest common divisor
194 Arithmetic/Integer
194 Greatest element of a list
185 Array concatenation
185 Repeat a string
184 Integer comparison
183 Even or odd
182 Averages/Arithmetic mean
181 Increment a numerical string
176 Hello world/Graphical
171 Copy a string
168 Boolean values
167 Loops/Downward for
164 Character codes
163 String concatenation
162 Apply a callback to an array
162 Loops/Do-while
162 Loops/N plus one half
162 Sieve of Eratosthenes
161 Array length
161 Hello world/Newline omission
161 Loops/For with a specified step
161 Loops/Foreach
161 Sum and product of an array
160 String length
158 Binary digits
157 Integer sequence
157 Loops/Break
156 Towers of Hanoi
155 String case
155 Sum of a series
153 Generic swap
153 Palindrome detection
153 Tokenize a string
152 Dot product
152 Leap year
152 Logical operations
151 Empty string
151 Hailstone sequence
151 Rot-13
151 Sum of squares
148 Associative array/Creation
148 Filter
145 Execute a system command
145 Quine
145 Sort an integer array
145 Sorting algorithms/Bubble sort
143 Factors of an integer
142 Guess the number
140 Caesar cipher
140 Higher-order functions
140 Remove duplicate elements
139 Determine if a string is numeric
139 File input/output
139 Roman numerals/Encode
139 User input/Text
138 System time
136 Day of the week
136 Hello world/Standard error
136 Loop over multiple arrays simultaneously
136 Sorting algorithms/Quicksort
135 Bitwise operations
135 Command-line arguments
134 Primality by trial division
133 Luhn test of credit card numbers
133 Read entire file
132 Create a file
131 Loops/Continue
131 Stack
131 Substring
130 Sleep
128 Check that file exists
128 Generate lower case ASCII alphabet
128 Literals/String
128 Mutual recursion
127 Date format
127 Happy numbers
126 Pascal's triangle
125 Flatten a list
125 Least common multiple
125 Zero to the zero power
123 Binary search
122 ABC problem
122 Balanced brackets
122 Literals/Integer
121 Include a file  
121 Loops/Nested
121 Program termination
120 Compound data type
120 Detect division by zero
120 Ethiopian multiplication
120 Variables
119 Associative array/Iteration
119 Formatted numeric output
119 Function composition
119 Knuth shuffle
118 Null object
117 Averages/Root mean square
117 Read a file line by line
116 Anagrams
116 File size
116 Hash from two arrays
116 N-queens problem
116 Search a list
115 Classes  
115 Mandelbrot set
114 Count in octal
114 Delete a file
114 Sorting algorithms/Insertion sort
113 Case-sensitivity of identifiers
113 Guess the number/With feedback
113 Matrix multiplication
113 Matrix transposition
113 Multiplication tables
113 Real constants and functions
112 Babbage problem
112 Count occurrences of a substring
112 Environment variables
112 Identity matrix
112 Input loop
112 Roman numerals/Decode
112 String matching
111 Averages/Median
111 Hostname  
111 Random numbers
110 Align columns
109 Arithmetic/Complex
109 Find limit of recursion
109 HTTP
109 Haversine formula
109 Perfect numbers
109 Pick random element
109 Rename a file
108 Accumulator factory
108 Letter frequency
108 Return multiple values
107 Conway's Game of Life
107 Infinity
106 Catalan numbers
106 Pangram checker
105 Assertions
105 Horner's rule for polynomial evaluation
105 Temperature conversion
104 Arithmetic-geometric mean
104 Averages/Pythagorean means
104 Levenshtein distance
104 Program name
104 Variadic function
103 Anonymous recursion
103 Evaluate binomial coefficients
103 Permutations
103 Run-length encoding
103 Strip a set of characters from a string
103 Substring/Top and tail
102 Exceptions
102 Prime decomposition
102 Regular expressions
101 String append
100 Combinations
100 Look-and-say sequence
100 Queue/Definition
100 String interpolation (included)
100 Trigonometric functions
100 Zig-zag matrix
99 Comma quibbling
99 Nth root
99 Reverse words in a string
99 Strip whitespace from a string/Top and tail
98 Short-circuit evaluation
98 Sorting algorithms/Merge sort
97 24 game
97 Bulls and cows
97 Sorting algorithms/Selection sort
96 Ordered words
96 Shell one-liner  
96 Sum multiples of 3 and 5
96 Y combinator
95 Arbitrary-precision integers (included)
95 Call a function
95 Create a two-dimensional array at runtime
95 Interactive programming    
95 Sierpinski triangle
94 Collections
94 Enumerations
94 Middle three digits
94 Power set
94 Range extraction
93 Inheritance/Single  
93 Range expansion
93 String prepend
93 Vector products
92 Create an HTML table
92 Evolutionary algorithm
92 Execute Brain****
92 Exponentiation operator
92 First-class functions
92 Sorting algorithms/Gnome sort
92 Time a function
91 Averages/Mode
91 Sequence of non-squares
91 Sorting algorithms/Cocktail sort
91 Sum digits of an integer
90 Digital root
90 MD5
90 Sierpinski carpet
90 The Twelve Days of Christmas
90 Walk a directory/Non-recursively
89 Averages/Simple moving average
89 Cumulative standard deviation
89 Random number generator (included)
88 Dragon curve
88 JSON  
88 Langton's ant
88 One-dimensional cellular automata
88 Sort using a custom comparator
87 Entropy
87 Forward difference
87 N'th
87 String comparison  
87 Symmetric difference
86 Hamming numbers
86 Josephus problem
86 Monty Hall problem
86 Sorting algorithms/Bogosort
85 CSV data manipulation
85 Five weekends
85 Gray code
85 Harshad or Niven series
85 Number names
84 Abstract type
84 CSV to HTML translation
84 Greatest subsequential sum
84 Price fraction
84 Window creation    
83 Compare a list of strings
83 Hello world/Newbie
83 Sort an array of composite structures
83 Tree traversal
82 Abundant, deficient and perfect number classifications
82 Closures/Value capture
82 File modification time
82 Last Friday of each month
82 Map range
82 Menu
82 Simple windowed application    
81 Sorting algorithms/Heapsort
80 Box the compass
80 Introspection
80 Literals/Floating point  
80 Non-decimal radices/Convert
80 Queue/Usage
80 SEDOLs
79 Amicable pairs
79 Catamorphism
79 Number reversal game
79 Singly-linked list/Traversal
79 URL decoding
79 Walk a directory/Recursively
79 Web scraping  
78 Count in factors
78 Count the coins
78 Hello world/Line printer  
78 Monte Carlo methods
78 Set
78 Spiral matrix
78 Terminal control/Clear the screen  
78 XML/Input
77 Address of a variable      
77 Bitmap
77 CRC-32
77 Calculating the value of e
77 Concurrent computing  
77 Find common directory path
77 Floyd's triangle
77 Knapsack problem/0-1
77 Long multiplication
77 Playing cards
77 Read a specific line from a file
77 Roots of unity
77 Show the epoch
77 Sockets  
77 Sorting algorithms/Shell sort
77 Terminal control/Ringing the terminal bell
76 Call an object method    
76 Date manipulation
76 Hofstadter Q sequence
76 Linear congruential generator
76 Order two numerical lists
76 Top rank per group
75 Dynamic variable names      
75 Jensen's Device
75 Kaprekar numbers
75 Keyboard input/Obtain a Y or N response    
75 Lucas-Lehmer test
75 Man or boy test
75 Multifactorial
75 Pythagorean triples  
75 Sorting algorithms/Counting sort
75 Strip comments from a string
75 URL encoding
75 Word wrap
74 Almost prime
74 Averages/Mean angle
74 Find the last Sunday of each month
74 Here document
74 List comprehensions
74 Proper divisors
73 Fibonacci n-step number sequences
73 Hello world/Web server
73 Modular inverse
73 Non-decimal radices/Output
73 Operator precedence  
73 Sorting algorithms/Comb sort
73 Soundex  
73 Unicode variable names  
72 Anagrams/Deranged anagrams
72 Calendar
72 Find the missing permutation
72 Semordnilap
72 Singly-linked list/Element definition
71 AKS test for primes
71 Animation  
71 Empty directory
71 Equilibrium index
71 Exceptions/Catch an exception thrown in a nested call
71 Gamma function  
71 Longest common subsequence
71 Multiple distinct objects
71 Repeat
71 SHA-1  
71 SHA-256  
71 Special characters    
71 Sudoku
71 Take notes on the command line
71 Write entire file
70 Bitmap/Bresenham's line algorithm
70 Execute HQ9+
70 Parsing/RPN calculator algorithm
70 Phrase reversals
70 Pi  
70 Polymorphism  
70 Read a configuration file  
70 Rock-paper-scissors  
70 Split a character string based on change of character
69 Call a foreign-language function  
69 Convert seconds to compound duration
69 Draw a sphere
69 Enforced immutability
69 Euler's sum of powers conjecture
69 Flow-control structures
69 Four bit adder
69 IBAN
69 Quaternion type
69 Sort disjoint sublist
69 Write float arrays to a text file
68 15 puzzle game    
68 Constrained random points on a circle
68 Guess the number/With feedback (player)
68 Horizontal sundial calculations  
68 Numerical integration
68 Population count
68 Self-describing numbers  
68 Stair-climbing puzzle
68 Trabb Pardo–Knuth algorithm  
68 Vigenère cipher
67 Catalan numbers/Pascal's triangle
67 Closest-pair problem
67 Combinations with repetitions
67 Currying
67 Fork
67 Fractal tree    
67 Largest int from concatenated ints
67 Munchausen numbers  
67 Show ASCII table
67 Sorting algorithms/Stooge sort
67 Text processing/Max licenses in use
67 Zeckendorf number representation
66 Arithmetic/Rational
66 Benford's law  
66 Chinese remainder theorem
66 Extend your language    
66 Jump anywhere  
66 Maze generation
65 Amb  
65 Euler method
65 Magic squares of odd order  
65 Named parameters    
65 Optional parameters  
65 Priority queue
65 Sort stability
65 Special variables    
65 Unix/ls
64 Continued fraction
64 Documentation    
64 Hofstadter-Conway $10,000 sequence
64 Inheritance/Multiple  
64 Morse code  
64 One of n lines in a file
64 Runtime evaluation          
64 Variable size/Get
64 XML/Output
63 Barnsley fern    
63 Fast Fourier transform
63 General FizzBuzz
63 Memory allocation
63 Nested function
63 Remove lines from a file
63 Roots of a function
63 Singly-linked list/Element insertion
63 Strip control codes and extended characters from a string
62 Cholesky decomposition
62 Factors of a Mersenne number
62 HTTPS    
62 Narcissistic decimal number
62 Pernicious numbers
62 Roots of a quadratic function
62 Sorting algorithms/Pancake sort  
62 Undefined values  
62 Write language name in 3D ASCII
61 Animate a pendulum    
61 Exponentiation order  
61 Get system command output
61 Non-decimal radices/Input
61 Probabilistic choice
61 Rep-string  
61 Sorting algorithms/Sleep sort  
61 Thue-Morse
60 Arithmetic evaluation  
60 Binary strings  
60 Circles of given radius through two points
60 Globally replace text in several files
60 Knapsack problem/Continuous
60 Modular exponentiation
60 Old lady swallowed a fly
60 Plot coordinate pairs    
60 Reduced row echelon form  
60 Runge-Kutta method
60 Semiprime
60 Sequence of primes by trial division
60 Van der Corput sequence
59 24 game/Solve
59 9 billion names of God the integer
59 Angle difference between two bearings
59 Anti-primes
59 Averages/Mean time of day
59 Best shuffle
59 Department numbers
59 Draw a clock  
59 Host introspection    
59 Knapsack problem/Unbounded  
59 Mouse position            
59 Test a function  
59 Unicode strings  
59 User input/Graphical      
59 Word frequency  
58 Brownian tree
58 Dutch national flag problem
58 Emirp primes
58 Huffman coding
58 Partial function application
58 Tic-tac-toe  
58 Truncatable primes
58 Yin and yang
57 Bitmap/Write a PPM file
57 Compile-time calculation  
57 Delegates    
57 Generator/Exponential
57 Hash join
57 Knight's tour
57 Left factorials
57 Miller–Rabin primality test  
57 Sorting algorithms/Bead sort    
56 2048  
56 4-rings or 4-squares puzzle
56 Add a variable to a class instance at runtime      
56 Deal cards for FreeCell
56 Doubly-linked list/Element definition  
56 Draw a cuboid
56 Fibonacci word
56 Integer overflow
56 Jewels and stones
56 JortSort
56 Leonardo numbers  
56 Matrix-exponentiation operator    
56 Odd word problem  
56 Random number generator (device)
56 Rosetta Code/Rank languages by popularity
56 Scope modifiers    
56 Singleton    
56 Sort three variables  
56 Stem-and-leaf plot
56 Terminal control/Coloured text  
56 Two sum  
55 DNS query
55 Define a primitive data type    
55 Dinesman's multiple-dwelling problem
55 Discordian date
55 Extract file extension
55 Extreme floating point values      
55 Forest fire  
55 I before E except after C
55 LZW compression
55 Mad Libs
55 Sorting algorithms/Permutation sort  
55 Stack traces    
55 Terminal control/Display an extended character
54 CUSIP
54 Cartesian product of two or more lists
54 Grayscale image  
54 Multisplit
54 Munching squares
54 Runtime evaluation/In an environment        
54 Sierpinski triangle/Graphical      
54 Synchronous concurrency  
54 Topological sort  
54 XML/XPath    
53 Base64 encode data
53 Damm algorithm  
53 Longest common prefix
53 Pointers and references  
53 Send email    
53 Stern-Brocot sequence
53 Subleq
53 Terminal control/Cursor positioning    
53 XML/DOM serialization    
52 100 prisoners  
52 Abundant odd numbers  
52 Bernoulli numbers
52 Draw a pixel          
52 First-class functions/Use numbers analogously  
52 Handle a signal  
52 Inverted syntax  
52 Ludic numbers
52 Maximum triangle path sum
52 Statistics/Basic
52 Ternary logic  
52 Text processing/2
52 Truncate a file  
52 Unbias a random generator
51 Convert decimal number to rational  
51 Iterated digits squaring
51 Keyboard input/Keypress check      
51 Long year    
51 Modulinos    
51 Quickselect algorithm
51 Wireworld    
50 Chinese zodiac  
50 Colour bars/Display      
50 Dining philosophers  
50 GUI component interaction      
50 Heronian triangles
50 Longest increasing subsequence
50 Loops/Increment loop index within loop body  
50 Non-continuous subsequences
50 Respond to an unknown method call    
50 Universal Turing machine
50 Validate International Securities Identification Number
49 Archimedean spiral  
49 Attractive numbers
49 Call a function in a shared library  
49 Dijkstra's algorithm
49 FASTA format  
49 Farey sequence
49 Find the intersection of two lines  
49 Fractran  
49 Gaussian elimination  
49 Seven-sided dice from five-sided dice
49 Smith numbers
49 Strip block comments
49 Text processing/1    
48 Base64 decode data      
48 Doubly-linked list/Element insertion  
48 Doubly-linked list/Traversal
48 Last letter-first letter
48 Polymorphic copy    
48 Shoelace formula for polygonal area  
48 Tokenize a string with escaping
47 Append a record to the end of a text file
47 Chaos game      
47 Echo server      
47 Extensible prime generator    
47 Jaro distance  
47 Longest common substring  
47 Make directory path
47 Metaprogramming  
47 Move-to-front algorithm
47 Polynomial regression
47 Rate counter  
47 Vector
47 Zebra puzzle
46 Average loop length  
46 Bitmap/Flood fill
46 Determinant and permanent  
46 Determine if a string has all the same characters
46 Determine if only one instance is running    
46 Egyptian division  
46 Greyscale bars/Display      
46 Holidays related to Easter      
46 Longest string challenge    
46 Naming conventions    
46 Pascal matrix generation
46 Sattolo cycle  
46 Search a list of records  
46 Stable marriage problem
45 Execute a Markov algorithm  
45 History variables  
45 Hofstadter Figure-Figure sequences
45 Image noise  
45 Magic 8-ball      
45 OpenGL      
45 Password generator    
45 Perfect shuffle
45 Pig the dice game
45 Send an unknown method call        
45 Set consolidation  
44 Active object    
44 Carmichael 3 strong pseudoprimes    
44 Copy stdin to stdout          
44 Doubly-linked list/Definition  
44 Element-wise operations  
44 GUI/Maximum window dimensions          
44 Kronecker product  
44 Narcissist  
44 Polynomial long division  
44 Rosetta Code/Count examples    
44 Sort numbers lexicographically    
44 Sparkline in unicode  
43 Atomic updates    
43 Bitmap/Read a PPM file  
43 Determine if a string has all unique characters  
43 Determine if a string is collapsible
43 Elementary cellular automaton  
43 Knapsack problem/Bounded  
43 Parsing/Shunting-yard algorithm  
43 Sorting algorithms/Radix sort
43 Ulam spiral (for primes)  
43 Verify distribution uniformity/Naive  
43 Visualize a tree    
42 Aliquot sequence classifications  
42 Associative array/Merging      
42 Bulls and cows/Player
42 Cantor set  
42 Digital root/Multiplicative digital root
42 Generate Chess960 starting position  
42 Keyboard input/Flush the keyboard buffer        
42 McNuggets problem        
42 Percentage difference between images    
42 RPG attributes generator    
42 Subtractive generator  
42 Van Eck sequence  
42 Voronoi diagram    
41 Bitmap/Midpoint circle algorithm  
41 Calendar - for "REAL" programmers        
41 Combinations and permutations      
41 Fusc sequence  
41 Hickerson series of almost integers  
41 Hilbert curve    
41 Kernighans large earthquake problem
41 MD5/Implementation      
41 Nim game          
41 Pascal's triangle/Puzzle
41 Speech synthesis        
41 Spinning rod animation/Text          
41 Start from a main routine        
41 Sum to 100
41 Table creation/Postal addresses        
41 Terminal control/Dimensions      
41 Text between
41 Twelve statements
41 Variable size/Set    
40 Balanced ternary  
40 Color of a screen pixel          
40 Currency    
40 Deepcopy            
40 GUI enabling/disabling of controls        
40 Gapful numbers    
40 Problem of Apollonius  
40 Secure temporary file      
40 Sorting algorithms/Strand sort    
40 Variable-length quantity
40 Water collected between towers
39 Brace expansion
39 Casting out nines  
39 Cramer's rule  
39 Inverted index  
39 Parametric polymorphism      
39 Permutations/Derangements  
39 S-expressions    
39 Summarize and say sequence  
39 Taxicab numbers  
39 Topswops  
39 UTF-8 encode and decode      
38 Abbreviations, automatic
38 Break OO privacy    
38 Colour pinstripe/Display            
38 Constrained genericity    
38 Euler's identity  
38 Fivenum  
38 Julia set    
38 Knuth's algorithm S  
38 Musical scale          
38 Parallel calculations      
38 Prime conspiracy  
38 Primorial numbers    
38 Scope/Function names and labels      
38 Sorting Algorithms/Circle Sort    
38 The Name Game  
37 Chowla numbers    
37 Create a file on magnetic tape      
37 Find palindromic numbers in both binary and ternary bases  
37 Flipping bits game    
37 ISBN13 check digit      
37 Kahan summation  
37 Magic squares of doubly even order  
37 Order disjoint list items  
37 Parsing/RPN to infix conversion  
37 Permutations by swapping  
37 Pythagorean quadruples  
37 QR decomposition    
37 Ray-casting algorithm    
37 Sailors, coconuts and a monkey problem
37 Sort a list of object identifiers    
37 Statistics/Normal distribution    
37 Vampire number
36 21 game          
36 Abbreviations, easy    
36 Bell numbers    
36 Cuban primes  
36 Days between dates    
36 Events          
36 Feigenbaum constant calculation  
36 Fibonacci word/fractal    
36 File extension is in extensions list  
36 Function prototype      
36 Input/Output for lines of text    
36 Input/Output for pairs of numbers
36 LU decomposition    
36 Lychrel numbers  
36 MAC Vendor Lookup  
36 Metered concurrency      
36 Numerical integration/Gauss-Legendre Quadrature    
36 Object serialization    
36 Pathological floating point problems          
36 Permutation test
36 Read a file character by character/UTF8      
36 Square but not cube  
36 Terminal control/Hiding the cursor    
36 Terminal control/Inverse video        
35 Abbreviations, simple  
35 Approximate equality  
35 Bitmap/Bézier curves/Cubic          
35 Bitwise IO    
35 Brazilian numbers    
35 Find the intersection of a line with a plane  
35 Floyd-Warshall algorithm  
35 Largest number divisible by its digits  
35 MD4      
35 Minesweeper game      
35 Multiline shebang        
35 Permutations with repetitions    
35 Pinstripe/Display          
35 Solve the no connection puzzle  
35 Substitution cipher  
35 Terminal control/Unicode output          
35 Test integerness  
35 Truth table      
34 Arithmetic-geometric mean/Calculate Pi  
34 Conjugate transpose    
34 Convex hull
34 Display a linear combination  
34 Egyptian fractions
34 Entropy/Narcissist    
34 Long primes      
34 Loops/Wrong ranges        
34 Maze solving      
34 Ordered partitions  
34 Penney's game  
34 Sutherland-Hodgman polygon clipping  
33 Check output device is a terminal
33 Continued fraction/Arithmetic/Construct from rational number  
33 Determine if a string is squeezable    
33 Executable library        
33 Humble numbers    
33 Integer roots
33 Loops/With multiple ranges          
33 Parametrized SQL statement        
33 Parse command-line arguments      
33 Pentagram        
33 RIPEMD-160      
33 Ranking methods
33 Recaman's sequence  
33 Remove vowels from a string            
33 Rosetta Code/Find bare lang tags          
33 Square-free integers  
33 Topic variable        
33 Totient function  
32 Bitcoin/address validation      
32 Bitmap/Bézier curves/Quadratic        
32 Cheryl's birthday  
32 Execute SNUSP        
32 Factorions      
32 Idiomatically determine all the lowercase and uppercase letters        
32 Metronome        
32 Mutex        
32 Pythagoras tree        
32 Sorting algorithms/Patience sort  
32 Subset sum problem
32 Type detection      
32 URL parser        
31 Apply a digital filter (direct form II transposed)      
31 Bitmap/Histogram      
31 Cycle detection    
31 Decimal floating point number to binary    
31 Determine if two triangles overlap      
31 Eban numbers  
31 First class environments      
31 Galton box animation      
31 Multi-dimensional array      
31 Multiple regression        
31 Multiplicative order  
31 Negative base numbers    
31 Numeric error propagation    
31 Pattern matching      
31 RSA code    
31 Resistor mesh    
31 Rosetta Code/Find unimplemented tasks      
31 Set puzzle  
31 Straddling checkerboard
31 Terminal control/Cursor movement          
31 Textonyms    
31 Write to Windows event log    
30 Check Machin-like formulas          
30 Check input device is a terminal      
30 Faulhaber's formula    
30 Faulhaber's triangle  
30 Implicit type conversion      
30 Keyboard macros            
30 Koch curve          
30 Mersenne primes      
30 Partition an integer x into n primes  
30 Poker hand analyser  
30 Reflection/List properties    
30 Simple database    
30 Solve a Hidato puzzle    
30 Use another language to call a function    
30 Xiaolin Wu's line algorithm    
29 Arena storage pool        
29 Chaocipher        
29 Chat server        
29 Checkpoint synchronization    
29 Death Star            
29 Dice game probabilities    
29 Draw a rotating cube            
29 FTP        
29 Memory layout of a data structure        
29 Old Russian measure of length      
29 Palindrome dates        
29 Parallel brute force        
29 Perfect totient numbers      
29 Pragmatic directives          
29 Terminal control/Preserve screen            
29 Window creation/X11              
29 Zhang-Suen thinning algorithm      
28 AVL tree        
28 Bacon cipher  
28 Bioinformatics/base count            
28 Church numerals            
28 Compiler/lexical analyzer            
28 Deconvolution/1D      
28 Diversity prediction theorem      
28 HTTPS/Authenticated        
28 Jacobi symbol      
28 Mian-Chowla sequence          
28 Modular arithmetic    
28 Safe primes and unsafe primes    
28 Sequence: smallest number greater than previous term with exactly n divisors        
28 Sequence: smallest number with exactly n divisors      
28 Set of real numbers  
28 Stream merge  
28 Word break problem      
27 Active Directory/Connect        
27 Burrows–Wheeler transform  
27 Chebyshev coefficients    
27 Chemical calculator        
27 Decision tables      
27 Find first and last set bit of a long integer        
27 Find largest left truncatable prime in a given base      
27 Formal power series          
27 Four is magic            
27 Honeycombs        
27 Lah numbers    
27 Paraffins    
27 Peano curve            
27 Polyspiral        
27 Primality by Wilson's theorem          
27 Ramsey's theorem          
27 Rosetta Code/Fix code tags      
27 Safe addition    
27 Sorting algorithms/Cycle sort      
27 State name puzzle  
27 Sum and product puzzle    
27 Superellipse          
27 Update a configuration file        
27 Verify distribution uniformity/Chi-squared test      
27 Weird numbers    
27 Yellowstone sequence    
26 Angles (geometric), normalization and conversion        
26 Cut a rectangle    
26 Distributed programming          
26 Fairshare between two and more      
26 First power of 2 that has leading decimal digits of 12      
26 Go Fish        
26 Law of cosines - triples      
26 Natural sorting      
26 Nautical bell      
26 Palindromic gapful numbers        
26 Reflection/List methods      
26 Same fringe      
26 Smarandache prime-digital sequence        
26 Strong and weak primes  
26 Table creation          
26 Thiele's interpolation formula        
25 Birthday problem      
25 Card shuffles  
25 Color wheel              
25 Create an object at a given address            
25 First perfect square in base n with n unique digits      
25 Fraction reduction    
25 Image convolution            
25 Kronecker product based fractals          
25 Length of an arc between two angles          
25 N-smooth numbers    
25 RCRPG          
25 Sequence of primorial primes          
25 Sexy primes        
25 Super-d numbers    
25 The ISAAC Cipher        
24 Abelian sandpile model              
24 Audio alarm            
24 Elliptic curve arithmetic      
24 Fermat numbers      
24 Gauss-Jordan matrix inversion        
24 Isqrt (integer square root) of X              
24 K-means++ clustering            
24 Machine code              
24 Pell's equation      
24 Perlin noise          
24 Plasma effect            
24 Play recorded sounds              
24 Ramer-Douglas-Peucker line simplification        
24 Range consolidation        
24 Sierpinski pentagon        
24 Simulate input/Keyboard              
24 Solve a Holy Knight's tour    
24 Stirling numbers of the second kind      
24 Successive prime differences  
24 Unprimeable numbers        
24 Welch's t-test          
24 World Cup group stage  
24 Yahoo! search interface          
23 A* search algorithm            
23 Circular primes        
23 Deming's Funnel        
23 Fixed length records            
23 Function frequency              
23 Generate random chess position      
23 Hough transform      
23 Idiomatically determine all the characters that can be used for symbols          
23 Magic squares of singly even order        
23 Main step of GOST 28147-89          
23 Make a backup file            
23 Markov chain text generator          
23 Minimum positive multiple in base 10 using only 0 and 1      
23 Monads/Maybe monad          
23 Möbius function            
23 Numbers with prime digits whose sum is 13            
23 Record sound              
23 SOAP                
23 Stirling numbers of the first kind      
23 Superpermutation minimisation        
23 Teacup rim text          
23 Video display modes                
23 Zumkeller numbers        
22 Base58Check encoding      
22 Cipolla's algorithm          
22 Create an object/Native demonstration        
22 Elementary cellular automaton/Random Number Generator      
22 Find duplicate files        
22 Intersecting number wheels        
22 Linux CPU utilization        
22 Lucky and even lucky numbers    
22 Mind boggling card trick          
22 Nonoblock    
22 Parse an IP Address      
22 Percolation/Mean run density        
22 Permutations/Rank of a permutation    
22 Pierpont primes        
22 Reverse the gender of a string          
22 Spelling of ordinal numbers              
22 Tonelli-Shanks algorithm          
22 Total circles area      
21 Active Directory/Search for a user        
21 Alternade words                
21 Commatizing numbers        
21 De Bruijn sequences        
21 Hunt the Wumpus            
21 Joystick position                
21 Kolakoski sequence      
21 Magnanimous numbers              
21 Matrix chain multiplication              
21 Numbers with equal rises and falls                
21 Orbital elements        
21 Pig the dice game/Player      
21 Playfair cipher      
21 Reflection/Get source          
21 Sorting algorithms/Cocktail sort with shifting bounds                
21 Window management                  
20 Addition chains        
20 Data Encryption Standard          
20 Eertree        
20 List rooted trees          
20 Longest common suffix              
20 Mastermind              
20 Median filter          
20 Native shebang            
20 Next highest int from digits        
20 Numeric separator syntax            
20 Random Latin squares        
20 Shortest common supersequence        
20 Snake and Ladder        
20 Sokoban        
20 Solve a Hopido puzzle      
20 Solve a Numbrix puzzle      
19 Assertions in design by contract      
19 Bilinear interpolation        
19 Bioinformatics/Sequence mutation            
19 Color quantization            
19 Esthetic numbers            
19 Finite state machine            
19 Index finite lists of positive integers      
19 Kosaraju            
19 Monads/List monad            
19 Montgomery reduction          
19 N-body problem          
19 Names to numbers        
19 Perceptron              
19 Print debugging statement            
19 Readline interface          
19 Simulate input/Mouse                
19 Sunflower fractal                
19 UPC          
19 Untrusted environment        
19 Vogel's approximation method      
18 Arithmetic coding/As a generalized change of radix        
18 Bitcoin/public point to address          
18 Code segment unload              
18 Compiler/code generator                
18 Draw pixel 2                  
18 EKG sequence convergence            
18 Elementary cellular automaton/Infinite length      
18 Find URI in text              
18 K-d tree      
18 Knuth's power tree            
18 Monads/Writer monad              
18 SQL-based authentication              
18 Selective file copy                
18 Sierpinski arrowhead curve            
18 Solve triangle solitare puzzle            
18 Sum data type              
18 Transportation problem          
18 Twin primes                
18 Vigenère cipher/Cryptanalysis          
17 15 puzzle solver                
17 ABC words                
17 Abelian sandpile model/Identity            
17 Canonicalize CIDR            
17 Compiler/syntax analyzer                  
17 Compiler/virtual machine interpreter                
17 File size distribution            
17 Imaginary base numbers            
17 Increasing gaps between consecutive Niven numbers          
17 Just in time processing on a character stream        
17 Levenshtein distance/Alignment          
17 Mertens function            
17 Metallic ratios              
17 P-value correction          
17 Percolation/Site percolation          
17 Primes - allocate descendants to their ancestors              
17 Proof              
17 Separate the house number from the street name          
17 Zeckendorf arithmetic          
16 ASCII art diagram converter            
16 Aspect oriented programming              
16 Bitmap/Read an image through a pipe              
16 Changeable words                
16 Chernick's Carmichael numbers                
16 Free polyominoes enumeration        
16 HTTPS/Client-authenticated          
16 Line circle intersection        
16 Matrix digital rain                
16 Most frequent k chars distance            
16 NYSIIS          
16 Nested templated data            
16 Odd words                
16 Particle swarm optimization          
16 Polynomial synthetic division        
16 Self-hosting compiler            
16 Terminal control/Positional read                  
16 Word search          
16 Word wheel              
15 Bitmap/PPM conversion through a pipe              
15 Geometric algebra            
15 Mayan numerals              
15 Nonogram solver            
15 Numerical integration/Adaptive Simpson's method              
15 Percolation/Bond percolation          
15 Percolation/Mean cluster density            
15 Prime words                
15 Rendezvous              
15 Retrieve and search chat history            
15 Self numbers                  
15 Singly-linked list/Element removal                  
15 Snake                
15 Suffix tree            
15 Tau function                
15 Words containing "the" substring                  
14 Biorhythms              
14 Compare sorting algorithms' performance            
14 Compiler/AST interpreter                
14 Cyclotomic polynomial              
14 Extra primes                
14 Functional coverage tree                
14 Generalised floating point addition            
14 Gradient descent              
14 Jaro-Winkler distance                  
14 Latin Squares in reduced form            
14 Logistic curve fitting in epidemiology              
14 Peaceful chess queen armies            
14 Permutations with some identical elements              
14 Rare numbers          
14 Square root by hand                
14 Tarjan            
14 Vibrating rectangles                  
14 XML validation                
13 Cistercian numerals                
13 Deconvolution/2D+              
13 Find if a point is within a triangle                
13 Four is the number of letters in the ...              
13 Long literals, with continuations              
13 Nimber arithmetic                  
13 Pisano period              
13 Pseudo-random numbers/PCG32                
13 Ramanujan's constant              
13 Sequence: nth number with exactly n divisors              
13 Sine wave              
13 Topological sort/Extracted top item              
12 Banker's algorithm                  
12 Calkin-Wilf sequence                
12 Canny edge detector              
12 Continued fraction/Arithmetic/G(matrix ng, continued fraction n)          
12 Factorial base numbers indexing permutations of a collection                
12 Getting the number of decimals                  
12 Interactive help                  
12 Longest palindromic substrings                
12 OpenWebNet password                  
12 Print itself                  
12 Product of divisors              
12 Pseudo-random numbers/Splitmix64                  
12 Safe mode              
12 Sierpinski curve                
12 Simulated annealing              
12 Tau number                
12 Ulam numbers                
11 Audio frequency generator                  
11 Exponentiation with infix operators in (or operating on) the base                  
11 Geohash                    
11 Greed                
11 Merge and aggregate datasets                  
11 Minimal steps down to 1                
11 Pancake numbers                
11 Partition function P                
11 Pentomino tiling                
11 Pseudo-random numbers/Xorshift star                  
11 Run as a daemon or service                  
11 Sierpinski square curve                
11 Sorting algorithms/Tree sort on a linked list                
11 Sum of divisors              
11 Tetris                    
11 Text completion                
11 VList            
11 XXXX redacted                  
10 Almkvist-Giullera formula for pi                  
10 Catmull–Clark subdivision surface              
10 Checksumcolor                  
10 Colour pinstripe/Printer                  
10 Execute CopyPasta Language                
10 External sort              
10 Faces from a mesh                
10 Launch rocket with countdown and acceleration in stdout                
10 One-time pad                  
10 Penrose tiling                  
10 Powerful numbers                
10 Railway circuit                  
10 Resistance calculator                  
10 SHA-256 Merkle tree                  
10 Spoof game                
10 Time-based one-time password algorithm              
10 Unit testing              
10 Using a speech engine to highlight words              
9 Combinations with repetitions/Square digit chain              
9 Curve that touches three points                
9 Display an outline as a nested table                  
9 Fibonacci matrix-exponentiation                
9 French Republican calendar                    
9 IPC via named pipe              
9 Morpion solitaire                
9 Non-transitive dice                    
9 Parse EBNF              
9 Pinstripe/Printer                  
9 Quoting constructs                
9 Rosetta Code/Tasks without examples                
9 Starting a web browser                
9 Suffixation of decimal numbers                
9 Text to HTML                  
9 Three word location                    
8 Hourglass puzzle                  
8 Minkowski question-mark function                  
8 Numerical and alphabetical suffixes                
8 Range modifications                  
8 Resistance network calculator                  
8 Rosetta Code/Rank languages by number of users                
8 Sort an outline at every level                  
8 Tree datastructures                
8 User defined pipe and redirection operators                
7 16 puzzle game                  
7 Brace expansion using ranges                    
7 Compiler/Verifying syntax                    
7 Elliptic Curve Digital Signature Algorithm                    
7 Fibonacci heap                  
7 Graph colouring                  
7 Mayan calendar                  
7 Multidimensional Newton-Raphson method                
7 Pseudo-random numbers/Combined recursive generator MRG32k3a                    
7 Pseudorandom number generator image                    
7 Robots                  
7 Two bullet roulette                    
7 URL shortener                    
6 Continued fraction/Arithmetic/G(matrix ng, continued fraction n1, continued fraction n2)                
6 Doubly-linked list/Element removal                    
6 OpenGL pixel shader                  
6 OpenGL/Utah Teapot                  
6 Recursive descent parser generator                
6 Rosetta Code/Run examples                  
6 Smallest enclosing circle problem                    
5 Addition-chain exponentiation                  
5 Audio overlap loop                  
5 Black Box                  
5 Boids                    
5 Chess player                    
5 Hexapawn                    
5 I'm a software engineer, get me out of here                    
5 Price list behind API                    
5 Process SMIL directives in XML data                  
5 Raster bars                    
5 Remote agent/Agent interface                  
5 Remote agent/Agent logic                  
5 Remote agent/Simulation                  
5 Solve a Rubik's Cube                    
5 Terminal control/Restricted width positional input/No wrapping                    
5 Terminal control/Restricted width positional input/With wrapping                    
5 War card game                    
5 Waveform analysis/Doh ray me                    
4 Generalised floating point multiplication                    
4 OLE automation                    
4 Strassen's algorithm                    
4 Tamagotchi emulator                    
4 Unicode polynomial equation                    
4 Using the Meetup.com API                    
4 Weather routing                    
3 Latin Squares in reduced form/Randomizing using Jacobson and Matthews’ Technique                    
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                    
3 WiktionaryDumps to words                    
2 15 puzzle game in 3D                    
2 CLI-based maze-game                    
2 IRC gateway                  
1 Blackjack strategy