Rosetta Code/Count examples/Full list/Tier 4

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Fourth tier of languages sorted by number of examples completed.

See Rosetta_Code/Rank_languages_by_popularity/Full_list for a full language/task completion table.

Top tier Second tier Third tier Fourth tier
Fourth ten programming languages by number of task examples completed:
    ㉛ JavaScript    ㉜ FreeBASIC     ㉝ AutoHotkey    ㉞ Ring          ㉟ Clojure      
    ㊱ F_Sharp       ㊲ ALGOL_68      ㊳ Unicon        ㊴ Fortran       ㊵ OCaml        
As of 2020-12-31T16:44:40Z :: 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