Rosetta Code/Count examples/Full list

From Rosetta Code

Full output for the Rosetta Code/Count examples#Perl_6 task. Updated periodically.

This is something of a experiment. The top 10 languages have their completed task entries marked with a circled digit in the table so you can sort on the language to see which tasks have been done. Hold down control and click on several columns to do secondary, tertiary, etc. sorts. Ideally it would be nice to be able to generate the table for any language but it is fairly intensive to generate. Once a week is ok, on demand would be unsustainable.

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

Top ten programming languages by number of task examples completed:
① Go
② Perl 6
③ Python
④ Kotlin
⑤ Julia
⑥ Phix
⑦ Perl
⑧ Racket
⑨ C
⑩ J
As of 2019-06-16T21:04:56Z :: Tasks: 938 :: Draft Tasks:230 :: Total Tasks: 1168 :: Total Examples: 62161
Count Task
425 Hello world/Text
292 99 Bottles of Beer
285 100 doors
281 FizzBuzz
258 Fibonacci sequence
254 Comments
249 Factorial
236 A+B
227 Empty program
220 Function definition
207 Loops/Infinite
203 Ackermann function
203 Loops/While
200 Arrays
198 Reverse a string
191 Loops/For
185 Conditional structures
181 Arithmetic/Integer
181 Greatest element of a list
175 Greatest common divisor
174 Averages/Arithmetic mean
172 Array concatenation
172 Integer comparison
168 Boolean values
168 Repeat a string
165 Increment a numerical string
165 Loops/Downward for
162 Hello world/Graphical
160 Copy a string
160 Loops/For with a specified step
159 Even or odd
154 Apply a callback to an array
153 Loops/Foreach
152 Sum and product of an array
151 String length
150 Loops/Do-while
149 Character codes
148 Hello world/Newline omission
148 String concatenation
148 Towers of Hanoi
146 Binary digits
146 Loops/Break
146 Loops/N plus one half
146 Sum of a series
145 Integer sequence
145 Sieve of Eratosthenes
144 Palindrome detection
144 String case
143 Generic swap
142 Sum of squares
141 Dot product
141 Hailstone sequence
141 Leap year
141 Logical operations
141 Tokenize a string
140 Filter
140 Rot-13
138 Array length
137 Associative array/Creation
137 Execute a system command
137 Sort an integer array
134 Empty string
132 Determine if a string is numeric
131 Higher-order functions
130 Caesar cipher
130 File input/output
130 Remove duplicate elements
130 Sorting algorithms/Bubble sort
130 User input/Text
128 Command-line arguments
128 Quine
128 Read entire file
127 Factors of an integer
127 Guess the number
126 Bitwise operations
126 Create a file
126 Hello world/Standard error
126 Roman numerals/Encode
126 System time
124 Primality by trial division
123 Day of the week
121 Check that file exists
121 Luhn test of credit card numbers
121 Pascal's triangle
121 Sorting algorithms/Quicksort
120 Literals/String
120 Mutual recursion
120 Substring
119 Loops/Continue
119 Sleep
118 Least common multiple
118 Literals/Integer
117 Happy numbers
117 Loop over multiple arrays simultaneously
117 Stack
114 Balanced brackets
114 Detect division by zero
114 Flatten a list
114 Include a file    
113 Binary search
113 Date format
113 Program termination
113 Variables
112 Associative array/Iteration
112 Compound data type
112 Knuth shuffle
111 File size
111 Read a file line by line
111 Real constants and functions
110 Averages/Root mean square
110 Function composition
110 Loops/Nested
110 Null object
110 Search a list
109 Formatted numeric output
109 Generate lower case ASCII alphabet
108 ABC Problem
108 Ethiopian multiplication
108 Hostname    
108 N-queens problem
107 Averages/Median
107 Case-sensitivity of identifiers
107 Classes  
107 Delete a file
107 Input loop
107 Mandelbrot set
107 Multiplication tables
107 Rename a file
106 Count in octal
106 Matrix multiplication
106 Matrix transposition
105 Environment variables
105 Guess the number/With feedback
105 Hash from two arrays
105 Return multiple values
104 HTTP
104 Identity matrix
104 Random numbers
104 Sorting algorithms/Insertion sort
103 Accumulator factory
103 Arithmetic/Complex
103 Pick random element
102 Anagrams  
102 Averages/Pythagorean means
102 Find limit of recursion
102 Pangram checker
102 Roman numerals/Decode
102 String matching  
102 Zero to the zero power
101 Assertions
101 Count occurrences of a substring
101 Create a two-dimensional array at runtime
101 Haversine formula
101 Perfect numbers
100 Align columns
100 Horner's rule for polynomial evaluation
98 Catalan numbers
98 Program name
97 Babbage problem
97 Combinations
97 Evaluate binomial coefficients
97 Regular expressions
97 Temperature conversion
97 Zig-zag matrix
96 Arithmetic-geometric mean
96 Conway's Game of Life
96 Infinity
96 Run-length encoding
96 Strip a set of characters from a string
96 Strip whitespace from a string/Top and tail
96 Substring/Top and tail
95 Exceptions
95 Trigonometric functions
95 Variadic function
94 Anonymous recursion  
94 Letter frequency
94 String interpolation (included)
93 24 game
93 Prime decomposition
93 Short-circuit evaluation
92 Sorting algorithms/Selection sort
91 Collections
91 Comma quibbling
91 Levenshtein distance
91 Power set
91 Shell one-liner  
91 Sorting algorithms/Merge sort
90 Nth root
90 Permutations
90 Reverse words in a string
89 Enumerations
89 First-class functions
89 Middle three digits
89 Ordered words
89 Queue/Definition
89 Range extraction
89 Sierpinski triangle
88 Look-and-say sequence
88 One-dimensional cellular automata
88 Sequence of non-squares
87 Averages/Mode
87 Bulls and cows
87 Exponentiation operator
87 Random number generator (included)
87 Range expansion
87 String append
86 Arbitrary-precision integers (included)
86 Call a function
86 Interactive programming    
86 Walk a directory/Non-recursively
86 Y combinator
85 Create an HTML table
85 Inheritance/Single  
85 MD5
85 Sort using a custom comparator
85 Sorting algorithms/Gnome sort
85 String prepend
85 Sum multiples of 3 and 5
84 Cumulative standard deviation
84 Evolutionary algorithm
84 Five weekends
83 Forward difference
83 Monty Hall problem
83 Time a function
83 Vector products
82 Averages/Simple moving average
82 Digital root
82 Langton's ant
82 Symmetric difference
81 Entropy
81 File modification time
81 Greatest subsequential sum
81 Hamming numbers
81 Harshad or Niven series
81 N'th
81 Sierpinski carpet
81 Sum digits of an integer
81 Window creation
80 Dragon curve
80 Sorting algorithms/Cocktail sort
79 Abstract type  
78 CSV data manipulation
78 Execute Brain****
78 Menu
78 Price fraction
78 Sorting algorithms/Bogosort
77 Hello world/Line printer
77 JSON
77 Literals/Floating point
77 Map range
77 Monte Carlo methods
77 Queue/Usage
77 Simple windowed application
77 Tree traversal
77 Web scraping
76 CSV to HTML translation
76 Catamorphism
76 Introspection  
76 Non-decimal radices/Convert
76 SEDOLs
76 Set
76 The Twelve Days of Christmas
75 Abundant, deficient and perfect number classifications
75 Box the compass
75 Closures/Value capture
75 Count in factors
75 Floyd's triangle
75 Gray code
75 Last Friday of each month
75 Sort an array of composite structures
75 Walk a directory/Recursively
74 Amicable pairs
74 Josephus problem
74 Number reversal game
74 Show the epoch
74 Sorting algorithms/Heapsort
74 Spiral matrix
73 Bitmap
73 Read a specific line from a file
73 String comparison
73 Top rank per group
73 URL decoding
73 XML/Input  
72 Knapsack problem/0-1
72 Singly-linked list/Traversal
72 Sorting algorithms/Shell sort
72 Terminal control/Ringing the terminal bell
71 Concurrent computing
71 Dynamic variable names  
71 Find common directory path
71 Man or boy test
71 Playing cards
71 Terminal control/Clear the screen
70 Address of a variable    
70 Almost prime
70 Date manipulation
70 Linear congruential generator
70 Order two numerical lists
70 Roots of unity
70 Sockets  
70 Soundex
70 Special characters
70 Strip comments from a string
70 URL encoding
69 Call an object method    
69 Fibonacci n-step number sequences
69 Find the missing permutation
69 Jensen's Device
69 Kaprekar numbers
69 Keyboard input/Obtain a Y or N response  
69 List comprehensions
69 Long multiplication
69 Lucas-Lehmer test
69 Number names    
69 Pythagorean triples
69 Take notes on the command line
68 Averages/Mean angle
68 Bitmap/Bresenham's line algorithm
68 Compare a list of strings
68 Count the coins
68 Hello world/Newbie
68 Here document
68 Non-decimal radices/Output
68 Pi
67 CRC-32
67 Equilibrium index
67 Find the last Sunday of each month
67 Flow-control structures
67 Hello world/Web server  
67 Multifactorial
67 Multiple distinct objects
67 Parsing/RPN calculator algorithm
67 Polymorphism
67 Proper divisors
67 Singly-linked list/Element definition
67 Sorting algorithms/Comb sort
67 Sorting algorithms/Counting sort
67 Unicode variable names
67 Word wrap
66 Convert seconds to compound duration
66 Empty directory
66 Hofstadter Q sequence
66 Longest common subsequence
66 Sorting algorithms/Stooge sort
66 Stair-climbing puzzle
66 Sudoku
66 Trabb Pardo–Knuth algorithm
66 Vigenère cipher
66 Write float arrays to a text file
65 Anagrams/Deranged anagrams
65 Exceptions/Catch an exception thrown in a nested call
65 Gamma function
65 Modular inverse
65 Semordnilap
64 Calendar
64 Enforced immutability
64 IBAN
64 Named parameters
64 Read a configuration file
64 Sort disjoint sublist
63 Catalan numbers/Pascal's triangle
63 Guess the number/With feedback (player)
63 Largest int from concatenated ints
63 Numerical integration
63 Operator precedence
63 Rock-paper-scissors
62 AKS test for primes
62 Animation  
62 Call a foreign-language function  
62 Closest-pair problem
62 Euler method
62 Fork
62 Four bit adder
62 HTTPS
62 Horizontal sundial calculations
62 Quaternion type
62 Runtime evaluation    
62 Self-describing numbers
62 Sort stability
62 Text processing/Max licenses in use  
62 Zeckendorf number representation
61 Arithmetic/Rational
61 Benford's law
61 Combinations with repetitions
61 Constrained random points on a circle
61 Currying
61 Draw a sphere
61 Magic squares of odd order
61 One of n lines in a file
61 Phrase reversals
61 Special variables
61 Strip control codes and extended characters from a string
61 Van der Corput sequence
60 Execute HQ9+
60 Hofstadter-Conway $10,000 sequence
60 Inheritance/Multiple    
60 Maze generation
60 Probabilistic choice
60 Roots of a quadratic function
60 SHA-1
60 Split a character string based on change of character
60 Variable size/Get
60 Yin and yang
59 Amb
59 Euler's sum of powers conjecture
59 Fractal tree
59 Host introspection
59 Jump anywhere
59 Optional parameters
59 Priority queue
59 Remove lines from a file
59 Repeat
59 SHA-256
59 Singly-linked list/Element insertion
59 Undefined values
59 Write entire file
58 Extend your language  
58 Memory allocation
58 Munchausen numbers
58 Pernicious numbers
58 Roots of a function
58 Runge-Kutta method
58 XML/Output
57 Calculating the value of e
57 Continued fraction
57 Documentation  
57 Fast Fourier transform
57 Miller–Rabin primality test
57 Narcissistic decimal number
57 Reduced row echelon form
57 Sorting algorithms/Pancake sort
57 Write language name in 3D ASCII
56 24 game/Solve
56 Animate a pendulum
56 Chinese remainder theorem
56 Cholesky decomposition
56 Globally replace text in several files
56 Knapsack problem/Unbounded
56 Morse code
56 Non-decimal radices/Input
56 Old lady swallowed a fly
56 Partial function application
56 Sorting algorithms/Sleep sort  
55 Circles of given radius through two points
55 Factors of a Mersenne number
55 Huffman coding
55 LZW compression
55 Stem-and-leaf plot
55 Test a function  
55 Unix/ls
54 Add a variable to a class instance at runtime      
54 Averages/Mean time of day
54 Binary strings  
54 Brownian tree
54 Draw a clock
54 Generator/Exponential
54 Knapsack problem/Continuous
54 Nested function
54 Odd word problem
54 Plot coordinate pairs
54 Population count
54 Sequence of primes by trial division
54 Sorting algorithms/Bead sort
53 Arithmetic evaluation
53 Best shuffle
53 Deal cards for FreeCell
53 Extreme floating point values
53 Forest fire  
53 Mouse position  
53 Rep-string
53 Semiprime
53 Singleton  
53 Stack traces
53 Tic-tac-toe
53 XML/XPath    
52 15 Puzzle Game
52 Delegates
52 Dinesman's multiple-dwelling problem
52 Fibonacci word
52 Hash join  
52 Modular exponentiation
52 Munching squares
52 Pointers and references  
52 Rosetta Code/Rank languages by popularity  
52 Runtime evaluation/In an environment    
52 Scope modifiers
52 Send email    
52 Sorting algorithms/Permutation sort
52 Synchronous concurrency
52 Truncate a file
51 Bitmap/Write a PPM file
51 Compile-time calculation  
51 Dutch national flag problem
51 Get system command output  
51 Knight's tour
51 Matrix-exponentiation operator
51 Random number generator (device)
51 Terminal control/Display an extended character
51 Two Sum
51 User input/Graphical
50 Dining philosophers
50 General FizzBuzz
50 Handle a signal  
50 I before E except after C
50 Multisplit
50 Non-continuous subsequences
50 Statistics/Basic
50 Topological sort
49 Define a primitive data type    
49 Draw a cuboid
49 Emirp primes
49 Integer overflow
49 JortSort
49 Maximum triangle path sum
49 Modulinos      
49 Seven-sided dice from five-sided dice
49 Sierpinski triangle/Graphical
49 Sort three variables
49 Unbias a random generator
49 Unicode strings
49 Wireworld  
48 9 billion names of God the integer
48 Angle difference between two bearings
48 Barnsley fern
48 Doubly-linked list/Element definition
48 Grayscale image
48 Left factorials
48 Quickselect algorithm
48 Respond to an unknown method call  
48 Ternary logic
48 Thue-Morse
48 XML/DOM serialization  
47 Color of a screen pixel      
47 Convert decimal number to rational
47 DNS query    
47 Department Numbers
47 Exponentiation order
47 Heronian triangles
47 Inverted syntax  
47 Iterated digits squaring
47 Text processing/2
47 Truncatable primes    
46 4-rings or 4-squares puzzle  
46 First-class functions/Use numbers analogously  
46 Longest increasing subsequence
46 Ludic numbers
46 Stable marriage problem
46 Stern-Brocot sequence
46 Terminal control/Cursor positioning  
46 Text processing/1
46 Zebra puzzle
45 Bernoulli numbers
45 Discordian date
45 Extract file extension
45 Greyscale bars/Display
45 Keyboard input/Keypress check  
45 Leonardo numbers
45 Move-to-front algorithm
45 Polymorphic copy
45 Rate counter
45 Universal Turing machine
44 Call a function in a shared library    
44 Echo server    
44 FASTA format  
44 Mad Libs  
44 Pascal matrix generation
44 Polynomial regression
44 Search a list of records
44 Send an unknown method call  
44 Strip block comments
44 Subleq
44 Validate International Securities Identification Number
43 2048    
43 Cartesian product of two or more lists
43 Determine if only one instance is running  
43 Dijkstra's algorithm
43 Doubly-linked list/Element insertion
43 Doubly-linked list/Traversal  
43 Fractran
43 GUI component interaction  
43 Last letter-first letter
43 Make directory path
43 Metaprogramming
43 Parsing/Shunting-yard algorithm
43 Rosetta Code/Count examples      
42 Bitmap/Read a PPM file
42 CUSIP
42 Execute a Markov algorithm
42 Extensible prime generator
42 History variables  
42 Hofstadter Figure-Figure sequences  
42 Holidays related to Easter
42 Longest string challenge
42 Perfect shuffle
42 Pig the dice game  
42 Polynomial long division
42 Smith numbers
42 Verify distribution uniformity/Naive
41 Archimedean spiral
41 Element-wise operations
41 Image noise
41 OpenGL  
41 Sattolo cycle
41 Set consolidation
41 Table creation/Postal addresses  
41 Terminal control/Coloured text
41 Twelve statements  
40 Active object
40 Atomic updates  
40 Base64 encode data
40 Chinese zodiac
40 Digital root/Multiplicative digital root
40 Farey sequence
40 Find the intersection of two lines
40 Gaussian elimination
40 MD5/Implementation
40 Narcissist
40 Password generator
40 Percentage difference between images
40 Problem of Apollonius
40 Sparkline in unicode
40 Subtractive generator
40 Variable size/Set
40 Visualize a tree
39 Append a record to the end of a text file
39 Average loop length
39 Bitmap/Flood fill  
39 Colour bars/Display
39 Determinant and permanent
39 Doubly-linked list/Definition  
39 Naming conventions
39 Secure temporary file    
39 Shoelace formula for polygonal area
39 Sorting algorithms/Strand sort
39 Sum to 100
39 Tokenize a string with escaping
38 Calendar - for "REAL" programmers    
38 GUI enabling/disabling of controls  
38 Generate Chess960 starting position
38 Knapsack problem/Bounded
38 Kronecker product
38 Longest common prefix
38 Parametric polymorphism    
38 Permutations/Derangements
38 Terminal control/Dimensions
38 Vector
37 Bulls and cows/Player
37 Chaos game  
37 Egyptian division
37 Hickerson series of almost integers
37 Inverted index
37 Jaro distance  
37 Permutations by swapping
37 Taxicab numbers
37 Ulam spiral (for primes)
36 Combinations and permutations
36 Constrained genericity        
36 Keyboard input/Flush the keyboard buffer  
36 Knuth's algorithm S
36 Ray-casting algorithm
36 Sorting algorithms/Radix sort
36 Statistics/Normal distribution
36 Topswops
36 Variable-length quantity
35 Aliquot sequence classifications
35 Anti-primes  
35 Bitmap/Midpoint circle algorithm    
35 Carmichael 3 strong pseudoprimes
35 Deepcopy
35 GUI/Maximum window dimensions  
35 Object serialization  
35 Order disjoint list items  
35 Parallel calculations  
35 Parsing/RPN to infix conversion
35 Pascal's triangle/Puzzle
35 Permutations with repetitions
35 Pythagorean quadruples
35 Sailors, coconuts and a monkey problem
35 Self-referential sequence
35 Speech synthesis    
35 Start from a main routine  
35 Vampire number
35 Voronoi diagram
35 Word count  
34 Balanced ternary  
34 Break OO privacy      
34 Elementary cellular automaton
34 Events    
34 Function prototype  
34 LU decomposition
34 MD4
34 Metered concurrency  
34 Permutation test
34 QR decomposition    
34 S-Expressions
34 Terminal control/Unicode output  
33 Colour pinstripe/Display
33 Find palindromic numbers in both binary and ternary bases
33 Floyd-Warshall algorithm
33 Input/Output for Pairs of Numbers
33 Longest Common Substring
33 Minesweeper game  
33 Multiline shebang      
33 Musical scale  
33 Terminal control/Hiding the cursor
33 Terminal control/Inverse video
33 Test integerness
33 Text between
33 Water collected between towers
32 Fibonacci word/fractal
32 Flipping bits game
32 Jewels and Stones
32 Julia set
32 Loops/Increment loop index within loop body  
32 Magic squares of doubly even order  
32 Numerical integration/Gauss-Legendre Quadrature
32 Parametrized SQL statement  
32 Penney's game
32 Primorial numbers
32 Scope/Function names and labels  
32 Sorting Algorithms/Circle Sort
31 Bitcoin/address validation  
31 Bitmap/Bézier curves/Cubic  
31 Bitwise IO  
31 Casting out nines  
31 Ordered Partitions
31 Pathological floating point problems
31 Pinstripe/Display
31 RIPEMD-160    
31 Ranking methods
31 Rosetta Code/Find bare lang tags        
31 Subset sum problem
31 Topic variable  
30 Bitmap/Histogram  
30 Cantor set
30 Damm algorithm
30 File extension is in extensions list
30 Galton box animation
30 Input/Output for Lines of Text
30 Keyboard macros  
30 Lychrel numbers  
30 Maze solving
30 Metronome
30 Pythagoras tree
30 Read a file character by character/UTF8
30 Resistor mesh
30 Simple database
30 Straddling checkerboard
30 Sutherland-Hodgman polygon clipping    
30 Truth table
30 UTF-8 encode and decode
29 Arithmetic-geometric mean/Calculate Pi
29 Bitmap/Bézier curves/Quadratic  
29 Brace expansion  
29 Conjugate transpose
29 Create a file on magnetic tape      
29 Draw a pixel  
29 Multiple regression  
29 Multiplicative order
29 Parse command-line arguments
29 Prime conspiracy    
29 RPG Attributes Generator
29 RSA code
29 Show Ascii table  
29 Sort a list of object identifiers  
29 Zhang-Suen thinning algorithm
28 Check Machin-like formulas  
28 Check output device is a terminal  
28 Continued fraction/Arithmetic/Construct from rational number
28 Currency
28 Entropy/Narcissist
28 Executable library    
28 Integer roots
28 Kernighans large earthquake problem
28 Negative base numbers
28 Pattern matching      
28 Rosetta Code/Find unimplemented tasks      
28 Set of real numbers
28 Solve a Hidato puzzle  
28 Solve the no connection puzzle    
28 Terminal control/Preserve screen  
28 Write to Windows event log      
27 Abbreviations, automatic    
27 Checkpoint synchronization  
27 Cramer's rule
27 Cycle detection
27 Deconvolution/1D
27 Egyptian fractions  
27 Find the intersection of a line with a plane
27 First class environments
27 Formal power series
27 Implicit type conversion
27 Kahan summation  
27 Memory layout of a data structure  
27 Numeric error propagation
27 Recaman's sequence  
27 Set puzzle
27 Square but not cube
27 URL parser  
27 Use another language to call a function      
27 Xiaolin Wu's line algorithm
26 Distributed programming      
26 Execute SNUSP
26 Find largest left truncatable prime in a given base
26 Fivenum
26 HTTPS/Authenticated  
26 MAC Vendor Lookup  
26 Multi-dimensional array
26 Nautical bell
26 Paraffins
26 Partition an integer X into N primes  
26 Pentagram
26 Poker hand analyser
26 Pragmatic directives
26 Rosetta Code/Fix code tags      
26 Safe addition
26 Sorting algorithms/Cycle sort
26 Spinning rod animation/Text  
26 State name puzzle
26 Substitution Cipher
26 Table creation    
26 Terminal control/Cursor movement  
26 The Name Game    
26 Update a configuration file
25 Active Directory/Connect        
25 Arena storage pool  
25 Chat server    
25 Check input device is a terminal    
25 Death Star  
25 Decimal floating point number to binary      
25 Display a linear combination
25 Euler's identity
25 FTP  
25 Find first and last set bit of a long integer
25 Natural sorting
25 Old Russian measure of length
25 Reflection/List methods    
25 Reflection/List properties      
25 Same Fringe  
25 Textonyms  
25 The ISAAC Cipher  
25 Verify distribution uniformity/Chi-squared test
24 Create an object at a given address      
24 Go Fish  
24 Idiomatically determine all the lowercase and uppercase letters  
24 Modular arithmetic    
24 Sorting algorithms/Patience sort  
24 Window creation/X11    
23 Bacon cipher
23 Card shuffles
23 Decision tables
23 Feigenbaum constant calculation    
23 Honeycombs    
23 Hough transform
23 Image convolution    
23 Magic 8-Ball
23 Polyspiral  
23 Ramsey's theorem  
23 Simulate input/Keyboard      
23 Solve a Holy Knight's tour  
23 Stream Merge    
23 Sum and Product Puzzle    
23 Superellipse
22 AVL tree          
22 Dice game probabilities
22 Faulhaber's formula  
22 Function frequency  
22 Fusc sequence      
22 Hilbert curve    
22 K-means++ clustering  
22 Make a backup file    
22 Mian-Chowla sequence    
22 Percolation/Mean run density
22 Permutations/Rank of a permutation
22 Plasma effect
22 Play recorded sounds            
22 RCRPG    
22 Sequence of primorial primes
22 Square-free integers
22 Total circles area
22 Welch's t-test
21 Birthday problem  
21 Cipolla's algorithm  
21 Compiler/lexical analyzer    
21 Cut a rectangle
21 Determine if two triangles overlap  
21 Faulhaber's triangle  
21 Main step of GOST 28147-89  
21 McNuggets Problem  
21 Nonoblock  
21 Pig the dice game/Player    
21 Record sound        
21 SOAP        
21 Thiele's interpolation formula  
21 Tonelli-Shanks algorithm  
21 Video display modes      
21 Window management    
21 Word break problem  
21 World Cup group stage  
20 Abbreviations, simple  
20 Apply a digital filter (direct form II transposed)    
20 Convex hull    
20 Copy stdin to stdout      
20 Kronecker product based fractals  
20 Machine code        
20 Parallel Brute Force    
20 Playfair cipher      
20 Reverse the gender of a string  
20 Safe primes and unsafe primes    
20 Sokoban  
20 Superpermutation minimisation
20 Totient function  
20 Type detection    
20 Yahoo! search interface            
19 AudioAlarm            
19 Chowla numbers    
19 Draw a rotating cube  
19 Elliptic curve arithmetic
19 Generate random chess position  
19 Idiomatically determine all the characters that can be used for symbols    
19 Largest number divisible by its digits  
19 Linux CPU utilization
19 Long primes
19 Loops/with multiple ranges  
19 Magic squares of singly even order  
19 Median filter  
19 Parse an IP Address  
19 Perfect totient numbers  
19 Ramer-Douglas-Peucker line simplification  
19 Sierpinski pentagon    
19 Simulate input/Mouse      
19 Solve a Numbrix puzzle    
19 Sort numbers lexicographically        
18 A* search algorithm      
18 Abbreviations, easy    
18 Active Directory/Search for a user              
18 Base58Check encoding    
18 Bilinear interpolation  
18 Chebyshev coefficients  
18 Create an object/Native demonstration    
18 Cuban primes        
18 Deming's Funnel  
18 Diversity prediction theorem    
18 Lucky and even lucky numbers    
18 Markov chain text generator    
18 Perlin noise  
18 Solve a Hopido puzzle    
17 Attractive numbers        
17 Bitcoin/public point to address    
17 Cheryl's Birthday    
17 Color quantization  
17 Commatizing numbers  
17 Data Encryption Standard        
17 Elementary cellular automaton/Random Number Generator    
17 Four is magic  
17 Joystick position              
17 Levenshtein distance/Alignment    
17 Loops/Wrong ranges  
17 Mersenne primes      
17 Mind boggling card trick    
17 Percolation/Site percolation
17 Readline interface    
17 Reflection/Get source      
17 SQL-based authentication    
17 Shortest common supersequence  
17 Snake And Ladder  
16 Assertions in design by contract        
16 Eertree    
16 HTTPS/Client-authenticated    
16 Index finite lists of positive integers  
16 K-d tree  
16 Law of cosines - triples  
16 N-body problem      
16 Orbital elements      
16 P-value correction    
16 Selective File Copy          
16 Sexy primes    
16 Strong and weak primes      
16 Vogel's approximation method  
15 Addition chains      
15 Aspect Oriented Programming    
15 Church Numerals        
15 Elementary cellular automaton/Infinite length      
15 Find duplicate files          
15 I.Q. Puzzle    
15 Kolakoski sequence    
15 Kosaraju    
15 List rooted trees    
15 NYSIIS    
15 Names to numbers    
15 Native shebang      
15 Nim Game    
15 Percolation/Bond percolation  
15 Percolation/Mean cluster density
15 Primes - allocate descendants to their ancestors
15 Rendezvous        
15 Separate the house number from the street name  
15 Vigenère cipher/Cryptanalysis      
15 Zeckendorf arithmetic      
14 Abundant odd numbers        
14 Arithmetic coding/As a generalized change of radix      
14 Bitmap/Read an image through a pipe      
14 Compiler/code generator        
14 Compiler/virtual machine interpreter        
14 EKG sequence convergence  
14 Find URI in text          
14 Finite state machine        
14 Free polyominoes enumeration        
14 Hunt The Wumpus        
14 Just in time processing on a character stream      
14 Knuth's power tree  
14 Monads/List monad        
14 Monads/Maybe monad            
14 Montgomery reduction      
14 Most frequent k chars distance    
14 Nested templated data      
14 Nonogram solver      
14 Perceptron          
14 Polynomial synthetic division    
14 Retrieve and search chat history          
14 Sequence: smallest number greater than previous term with exactly n divisors        
14 Sequence: smallest number with exactly n divisors        
14 Spelling of ordinal numbers      
14 Successive prime differences      
14 Terminal control/Positional read    
14 Untrusted environment      
13 Base64 decode data        
13 Code segment unload          
13 Color wheel        
13 Compare sorting algorithms' performance      
13 Compiler/syntax analyzer        
13 Imaginary base numbers        
13 Koch curve      
13 Range consolidation      
13 Transportation problem      
13 Weird numbers      
13 Word search      
12 Bitmap/PPM conversion through a pipe      
12 Burrows–Wheeler transform      
12 Chemical Calculator          
12 Compiler/AST interpreter        
12 Deconvolution/2D+    
12 First perfect square in base N with N unique digits          
12 Fixed length records        
12 Gauss-Jordan matrix inversion      
12 Mastermind        
12 Matrix chain multiplication      
12 Mayan numerals        
12 Particle Swarm Optimization          
12 Pell's equation          
12 Proof                
12 Snake          
12 Suffix tree    
12 Sunflower fractal          
12 Topological sort/Extracted top item  
12 Vibrating rectangles    
11 File size distribution    
11 Monads/Writer monad            
11 Numerical integration/Adaptive Simpson's method    
11 OpenWebNet Password      
11 Self-hosting compiler        
11 XML Validation          
10 15 puzzle solver          
10 Chaocipher      
10 Continued fraction/Arithmetic/G(matrix NG, Contined Fraction N)        
10 Peano curve      
10 Sequence: nth number with exactly n divisors        
10 Singly-linked list/Element removal        
10 VList          
9 ASCII art diagram converter        
9 Canny edge detector          
9 Chernick's Carmichael numbers            
9 Combinations with repetitions/Square Digit Chain        
9 Draw pixel 2      
9 Eban numbers      
9 Generalised floating point addition          
9 Parse EBNF            
9 Random Latin Squares            
9 Run as a daemon or service            
9 Smarandache prime-digital sequence              
8 Audio frequency generator                
8 Banker's algorithm        
8 Four is the number of letters in the ...        
8 French Republican calendar          
8 Simulated annealing            
8 Starting a web browser          
8 Suffixation of decimal numbers          
8 Tarjan          
8 Time-based One-time Password Algorithm              
7 21 Game          
7 Catmull–Clark subdivision surface              
7 Checksumcolor            
7 Colour pinstripe/Printer            
7 Curve that touches three points        
7 External sort        
7 Factorial base numbers indexing permutations of a collection          
7 Greed            
7 IPC via named pipe              
7 Interactive Help            
7 Morpion solitaire            
7 Numerical and alphabetical suffixes            
7 Penrose tiling          
7 Pentomino tiling              
7 Pinstripe/Printer              
7 Railway circuit            
7 Ramanujan's constant          
7 Resistance Calculator            
7 Sorting algorithms/Tree sort on a linked list          
7 Spoof game            
7 Tetris                  
7 User defined pipe and redirection operators          
7 Using a Speech engine to highlight words                  
6 Geometric algebra              
6 One-time pad          
6 OpenGL Pixel Shader            
6 OpenGL/Utah Teapot          
6 Peaceful chess queen armies          
6 Robots            
6 Rosetta Code/Rank languages by number of users            
6 Rosetta Code/Tasks without examples            
6 Safe mode              
5 Addition-chain exponentiation            
5 Continued fraction/Arithmetic/G(matrix NG, Contined Fraction N1, Contined Fraction N2)              
5 Fibonacci heap            
5 Functional coverage tree          
5 Hexapawn              
5 Matrix Digital Rain              
5 Multidimensional Newton-Raphson method              
5 Resistance Network Calculator            
5 Rosetta Code/Run examples                  
5 Sine wave            
5 Text to HTML              
4 Boids              
4 Mayan calendar            
4 OLE Automation                
4 Remote agent/Agent interface                
4 Remote agent/Agent logic                
4 Remote agent/Simulation                
4 Terminal control/Restricted width positional input/No wrapping            
4 Terminal control/Restricted width positional input/With wrapping            
4 Unit testing                
4 Using the Meetup.com API                
3 16 Puzzle Game                  
3 Audio Overlap Loop                  
3 Elliptic Curve Digital Signature Algorithm                
3 I'm a software engineer, get me out of here                
3 Solve a Rubik's Cube              
3 Tamagotchi emulator                    
2 Chess player                  
2 Generalised floating point multiplication                  
2 Process SMIL directives in XML data                  
2 Raster bars                
2 Recursive descent parser generator                  
2 Unicode polynomial equation                
1 15 Puzzle Game in 3D                    
1 Black Box                    
1 IRC gateway                    
1 Rosetta Code/List authors of task descriptions                  
1 Solving coin problems                  
1 Ukkonen’s Suffix Tree Construction                  
1 Waveform analysis/Doh ray me                  
1 Waveform analysis/Top and tail                  
0 Blackjack strategy                    
0 Chess player/Move generation                    
0 Chess player/Program options and user interface                    
0 Chess player/Search and evaluation                    
0 Rosetta Code/Tasks sorted by average lines of code                    
0 Weather Routing