"100 doors":
"100 prisoners":
"15 puzzle game":
"15 puzzle solver":
"2048":
"21 game":
"24 game":
"24 game/Solve":
"4-rings or 4-squares puzzle":
"99 bottles of beer":
"9 billion names of God the integer":
"A+B":
"Abbreviations, automatic":
"Abbreviations, easy":
"Abbreviations, simple":
"ABC problem":
"Abelian sandpile model":
"Abelian sandpile model/Identity":
"Abstract type":
"Abundant, deficient and perfect number classifications":
"Abundant odd numbers":
"Accumulator factory":
"Achilles numbers":
"Ackermann function":
"Active Directory/Connect":
"Active Directory/Search for a user":
"Active object":
"Add a variable to a class instance at runtime":
"Additive primes":
"Address of a variable":
"ADFGVX cipher":
"AKS test for primes":
"Algebraic data types":
"Align columns":
"Aliquot sequence classifications":
"Almkvist-Giullera formula for pi":
"Almost prime":
"Amb":
"Amicable pairs":
"Anagrams":
"Anagrams/Deranged anagrams":
"Angle difference between two bearings":
"Angles (geometric), normalization and conversion":
"Animate a pendulum":
"Animation":
"Anonymous recursion":
"Anti-primes":
"Append a record to the end of a text file":
"Apply a callback to an array":
"Apply a digital filter (direct form II transposed)":
"Approximate equality":
"Arbitrary-precision integers (included)":
"Archimedean spiral":
"Arena storage pool":
"Arithmetic/Complex":
"Arithmetic derivative":
"Arithmetic evaluation":
"Arithmetic-geometric mean":
"Arithmetic-geometric mean/Calculate Pi":
"Arithmetic/Integer":
"Arithmetic numbers":
"Arithmetic/Rational":
"Array concatenation":
"Array length":
"Arrays":
"Ascending primes":
"ASCII art diagram converter":
"Assertions":
"Associative array/Creation":
"Associative array/Iteration":
"Associative array/Merging":
"Atomic updates":
"Attractive numbers":
"Average loop length":
"Averages/Arithmetic mean":
"Averages/Mean angle":
"Averages/Mean time of day":
"Averages/Median":
"Averages/Mode":
"Averages/Pythagorean means":
"Averages/Root mean square":
"Averages/Simple moving average":
"AVL tree":
"Babbage problem":
"Babylonian spiral":
"Balanced brackets":
"Balanced ternary":
"Barnsley fern":
"Base64 decode data":
"Bell numbers":
"Benford's law":
"Bernoulli numbers":
"Best shuffle":
"Bézier curves/Intersections":
"Bifid cipher":
"Binary digits":
"Binary search":
"Binary strings":
"Bin given limits":
"Bioinformatics/base count":
"Bioinformatics/Global alignment":
"Bioinformatics/Sequence mutation":
"Biorhythms":
"Bitcoin/address validation":
"Bitcoin/public point to address":
"Bitmap":
"Bitmap/Bézier curves/Cubic":
"Bitmap/Bézier curves/Quadratic":
"Bitmap/Bresenham's line algorithm":
"Bitmap/Flood fill":
"Bitmap/Histogram":
"Bitmap/Midpoint circle algorithm":
"Bitmap/PPM conversion through a pipe":
"Bitmap/Read an image through a pipe":
"Bitmap/Read a PPM file":
"Bitmap/Write a PPM file":
"Bitwise IO":
"Bitwise operations":
"Blum integer":
"Boolean values":
"Box the compass":
"Boyer-Moore string search":
"Brace expansion":
"Brazilian numbers":
"Break OO privacy":
"Brilliant numbers":
"Brownian tree":
"Bulls and cows":
"Bulls and cows/Player":
"Burrows–Wheeler transform":
"Caesar cipher":
"Calculating the value of e":
"Calendar":
'Calendar - for "REAL" programmers':
"Calkin-Wilf sequence":
"Call a foreign-language function":
"Call a function":
"Call a function in a shared library":
"Call an object method":
"Camel case and snake case":
"Canny edge detector":
"Canonicalize CIDR":
"Cantor set":
"Carmichael 3 strong pseudoprimes":
"Cartesian product of two or more lists":
"Case-sensitivity of identifiers":
"Casting out nines":
"Catalan numbers":
"Catalan numbers/Pascal's triangle":
"Catamorphism":
"Catmull–Clark subdivision surface":
"Chaocipher":
"Chaos game":
"Character codes":
"Chat server":
"Check input device is a terminal":
"Check Machin-like formulas":
"Check output device is a terminal":
"Checkpoint synchronization":
"Check that file exists":
"Chernick's Carmichael numbers":
"Cheryl's birthday":
"Chinese remainder theorem":
"Chinese zodiac":
"Cholesky decomposition":
"Chowla numbers":
"Church numerals":
"Circles of given radius through two points":
"Circular primes":
"Cistercian numerals":
"Classes":
"Closest-pair problem":
"Closures/Value capture":
"Collections":
"Colorful numbers":
"Color of a screen pixel":
"Color quantization":
"Color wheel":
"Colour bars/Display":
"Colour pinstripe/Display":
"Colour pinstripe/Printer":
"Combinations":
"Combinations and permutations":
"Combinations with repetitions":
"Command-line arguments":
"Comma quibbling":
"Commatizing numbers":
"Comments":
"Compare a list of strings":
"Compare length of two strings":
"Compare sorting algorithms' performance":
"Compiler/AST interpreter":
"Compiler/code generator":
"Compiler/lexical analyzer":
"Compiler/syntax analyzer":
"Compiler/virtual machine interpreter":
"Compile-time calculation":
"Composite numbers k with no single digit factors whose factors are all substrings of k":
"Compound data type":
"Concurrent computing":
"Conditional structures":
"Conjugate transpose":
"Consecutive primes with ascending or descending differences":
"Constrained genericity":
"Constrained random points on a circle":
"Continued fraction":
"Continued fraction/Arithmetic/Construct from rational number":
"Continued fraction/Arithmetic/G(matrix ng, continued fraction n)":
"Convert decimal number to rational":
"Convert seconds to compound duration":
"Convex hull":
"Conway's Game of Life":
"Copy a string":
"Copy stdin to stdout":
"Count in factors":
"Count in octal":
"Count occurrences of a substring":
"Count the coins":
"Cramer's rule":
"CRC-32":
"Create a file":
"Create a file on magnetic tape":
"Create an HTML table":
"Create an object at a given address":
"Create a two-dimensional array at runtime":
"CSV data manipulation":
"CSV to HTML translation":
"Cuban primes":
"Cullen and Woodall numbers":
"Cumulative standard deviation":
"Currency":
"Currying":
"Curzon numbers":
"CUSIP":
"Cut a rectangle":
"Cyclops numbers":
"Cyclotomic polynomial":
"Damm algorithm":
"Date format":
"Date manipulation":
"Day of the week":
"Deal cards for FreeCell":
"Death Star":
"De Bruijn sequences":
"Deceptive numbers":
"Deconvolution/1D":
"Deconvolution/2D+":
"Deepcopy":
"Define a primitive data type":
"Delegates":
"Delete a file":
"Deming's funnel":
"Department numbers":
"Descending primes":
"Detect division by zero":
"Determinant and permanent":
"Determine if a string has all the same characters":
"Determine if a string has all unique characters":
"Determine if a string is collapsible":
"Determine if a string is numeric":
"Determine if a string is squeezable":
"Determine if only one instance is running":
"Determine if two triangles overlap":
"Determine sentence type":
"Dice game probabilities":
"Digital root":
"Digital root/Multiplicative digital root":
"Dijkstra's algorithm":
"Dinesman's multiple-dwelling problem":
"Dining philosophers":
"Disarium numbers":
"Discordian date":
"Display a linear combination":
"Display an outline as a nested table":
"Distance and Bearing":
"Distributed programming":
"Distribution of 0 digits in factorial series":
"Diversity prediction theorem":
"DNS query":
"Documentation":
"Dominoes":
"Doomsday rule":
"Dot product":
"Doubly-linked list/Definition":
"Doubly-linked list/Element definition":
"Doubly-linked list/Element insertion":
"Doubly-linked list/Traversal":
"Dragon curve":
"Draw a clock":
"Draw a cuboid":
"Draw a pixel":
"Draw a rotating cube":
"Draw a sphere":
"Duffinian numbers":
"Dutch national flag problem":
"Dynamic variable names":
"Earliest difference between prime gaps":
"Eban numbers":
"Echo server":
"Eertree":
"Egyptian division":
"EKG sequence convergence":
"Elementary cellular automaton":
"Elementary cellular automaton/Infinite length":
"Elementary cellular automaton/Random number generator":
"Element-wise operations":
"Elliptic curve arithmetic":
"Elliptic Curve Digital Signature Algorithm":
"Emirp primes":
"Empty directory":
"Empty program":
"Empty string":
"Enforced immutability":
"Entropy":
"Entropy/Narcissist":
"Enumerations":
"Environment variables":
"Equal prime and composite sums":
"Equilibrium index":
"Erdős-Nicolas numbers":
"Erdös-Selfridge categorization of primes":
"Esthetic numbers":
"Ethiopian multiplication":
"Euclid-Mullin sequence":
"Euler method":
"Euler's constant 0.5772...":
"Euler's identity":
"Euler's sum of powers conjecture":
"Evaluate binomial coefficients":
"Even or odd":
"Events":
"Evolutionary algorithm":
"Exceptions":
"Exceptions/Catch an exception thrown in a nested call":
"Executable library":
"Execute a Markov algorithm":
"Execute a system command":
"Execute Brain****":
"Execute Computer/Zero":
"Execute HQ9+":
"Execute SNUSP":
"Exponentiation operator":
"Exponentiation order":
"Exponentiation with infix operators in (or operating on) the base":
"Extend your language":
"Extensible prime generator":
"Extreme floating point values":
"Faces from a mesh":
"Factorial":
"Factorial base numbers indexing permutations of a collection":
"Factorial primes":
"Factorions":
"Factors of a Mersenne number":
"Factors of an integer":
"Fairshare between two and more":
"Farey sequence":
"FASTA format":
"Fast Fourier transform":
"Faulhaber's formula":
"Faulhaber's triangle":
"Feigenbaum constant calculation":
"Fermat numbers":
"Fibonacci n-step number sequences":
"Fibonacci sequence":
"Fibonacci word":
"Fibonacci word/fractal":
"File extension is in extensions list":
"File input/output":
"File modification time":
"File size":
"File size distribution":
"Filter":
"Find Chess960 starting position identifier":
"Find common directory path":
"Find duplicate files":
"Find if a point is within a triangle":
"Find largest left truncatable prime in a given base":
"Find limit of recursion":
"Find palindromic numbers in both binary and ternary bases":
"Find the intersection of a line with a plane":
"Find the intersection of two lines":
"Find the last Sunday of each month":
"Find the missing permutation":
"First class environments":
"First-class functions":
"First-class functions/Use numbers analogously":
"First perfect square in base n with n unique digits":
"First power of 2 that has leading decimal digits of 12":
"Fivenum":
"Five weekends":
"Fixed length records":
"FizzBuzz":
"Flatten a list":
"Flipping bits game":
"Flow-control structures":
"Floyd's triangle":
"Floyd-Warshall algorithm":
"Forest fire":
"Fork":
"Formal power series":
"Formatted numeric output":
"Fortunate numbers":
"Forward difference":
"Four bit adder":
"Four is magic":
"Four is the number of letters in the ...":
"Fractal tree":
"Fraction reduction":
"Fractran":
"French Republican calendar":
"FTP":
"Functional coverage tree":
"Function composition":
"Function definition":
"Function frequency":
"Function prototype":
"Fusc sequence":
"Galton box animation":
"Gamma function":
"Gapful numbers":
"Gaussian elimination":
"Gauss-Jordan matrix inversion":
"General FizzBuzz":
"Generate Chess960 starting position":
"Generate lower case ASCII alphabet":
"Generate random chess position":
"Generator/Exponential":
"Generic swap":
"Get system command output":
"Giuga numbers":
"Globally replace text in several files":
"Go Fish":
"Goldbach's comet":
"Golden ratio/Convergence":
"Gotchas":
"Graph colouring":
"Gray code":
"Grayscale image":
"Greatest common divisor":
"Greatest element of a list":
"Greatest subsequential sum":
"Greedy algorithm for Egyptian fractions":
"Greyscale bars/Display":
"Guess the number":
"Guess the number/With feedback":
"Guess the number/With feedback (player)":
"GUI component interaction":
"GUI enabling/disabling of controls":
"GUI/Maximum window dimensions":
"Hailstone sequence":
"Halt and catch fire":
"Hamming numbers":
"Handle a signal":
"Happy numbers":
"Harmonic series":
"Harshad or Niven series":
"Hash from two arrays":
"Hash join":
"Haversine formula":
"Hello world/Graphical":
"Hello world/Line printer":
"Hello world/Newbie":
"Hello world/Newline omission":
"Hello world/Standard error":
"Hello world/Text":
"Hello world/Web server":
"Here document":
"Heronian triangles":
"Hex words":
"Hickerson series of almost integers":
"Higher-order functions":
"Hilbert curve":
"History variables":
"Hofstadter-Conway $10,000 sequence":
"Hofstadter Figure-Figure sequences":
"Hofstadter Q sequence":
"Holidays related to Easter":
"Home primes":
"Honeycombs":
"Horizontal sundial calculations":
"Horner's rule for polynomial evaluation":
"Host introspection":
"Hostname":
"Hough transform":
"HTTP":
"HTTPS":
"HTTPS/Authenticated":
"HTTPS/Client-authenticated":
"Huffman coding":
"Humble numbers":
"Hunt the Wumpus":
"IBAN":
"I before E except after C":
"Identity matrix":
"Idiomatically determine all the characters that can be used for symbols":
"Idiomatically determine all the lowercase and uppercase letters":
"Image convolution":
"Image noise":
"Imaginary base numbers":
"I'm a software engineer, get me out of here":
"Include a file":
"Increasing gaps between consecutive Niven numbers":
"Increment a numerical string":
"Index finite lists of positive integers":
"Infinity":
"Inheritance/Multiple":
"Inheritance/Single":
"Input loop":
"Integer comparison":
"Integer overflow":
"Integer sequence":
"Interactive programming (repl)":
"Intersecting number wheels":
"Introspection":
"Inverted index":
"Inverted syntax":
"ISBN13 check digit":
"Isograms and heterograms":
"Isqrt (integer square root) of X":
"Iterated digits squaring":
"Jacobi symbol":
"Jacobsthal numbers":
"Jaro similarity":
"Jaro-Winkler distance":
"Jensen's Device":
"Jewels and stones":
"Jordan-Pólya numbers":
"JortSort":
"Josephus problem":
"Joystick position":
"JSON":
"Juggler sequence":
"Julia set":
"Jump anywhere":
"Kaprekar numbers":
"K-d tree":
"Kernighans large earthquake problem":
"Keyboard input/Flush the keyboard buffer":
"Keyboard input/Keypress check":
"Keyboard input/Obtain a Y or N response":
"Keyboard macros":
"K-means++ clustering":
"Knapsack problem/0-1":
"Knapsack problem/Bounded":
"Knapsack problem/Continuous":
"Knapsack problem/Unbounded":
"Knight's tour":
"Knuth's algorithm S":
"Knuth shuffle":
"Knuth's power tree":
"Koch curve":
"Kolakoski sequence":
"Kosaraju":
"Kronecker product":
"Kronecker product based fractals":
"Lah numbers":
"Langton's ant":
"Largest int from concatenated ints":
"Largest number divisible by its digits":
"Largest proper divisor of n":
"Last Friday of each month":
"Last letter-first letter":
"Latin Squares in reduced form":
"Law of cosines - triples":
"Leap year":
"Least common multiple":
"Left factorials":
"Legendre prime counting function":
"Leonardo numbers":
"Letter frequency":
"Levenshtein distance":
"Levenshtein distance/Alignment":
"Linear congruential generator":
"List comprehensions":
"List rooted trees":
"Literals/Floating point":
"Literals/Integer":
"Literals/String":
"Logical operations":
"Logistic curve fitting in epidemiology":
"Longest common subsequence":
"Longest common substring":
"Longest increasing subsequence":
"Longest string challenge":
"Long literals, with continuations":
"Long multiplication":
"Long primes":
"Long year":
"Look-and-say sequence":
"Loop over multiple arrays simultaneously":
"Loops/Break":
"Loops/Continue":
"Loops/Do-while":
"Loops/Downward for":
"Loops/For":
"Loops/Foreach":
"Loops/For with a specified step":
"Loops/Increment loop index within loop body":
"Loops/Infinite":
"Loops/Nested":
"Loops/N plus one half":
"Loops/While":
"Loops/With multiple ranges":
"Loops/Wrong ranges":
"Lucas-Lehmer test":
"Lucky and even lucky numbers":
"LU decomposition":
"Ludic numbers":
"Luhn test of credit card numbers":
"Lychrel numbers":
"LZW compression":
"Machine code":
"MAC vendor lookup":
"Mad Libs":
"Magic 8-ball":
"Magic constant":
"Magic squares of doubly even order":
"Magic squares of odd order":
"Magic squares of singly even order":
"Magnanimous numbers":
"Main step of GOST 28147-89":
"Make directory path":
"Mandelbrot set":
"Man or boy test":
"Map range":
"Mastermind":
"Matrix chain multiplication":
"Matrix digital rain":
"Matrix-exponentiation operator":
"Matrix multiplication":
"Matrix transposition":
"Maximum triangle path sum":
"Mayan calendar":
"Mayan numerals":
"Maze generation":
"Maze solving":
"McNuggets problem":
"MD4":
"MD5":
"MD5/Implementation":
"Median filter":
"Meissel–Mertens constant":
"Memory allocation":
"Memory layout of a data structure":
"Menu":
"Merge and aggregate datasets":
"Mertens function":
"Metallic ratios":
"Metaprogramming":
"Metered concurrency":
"Metronome":
"Mian-Chowla sequence":
"Middle three digits":
"Miller–Rabin primality test":
"Mind boggling card trick":
"Minesweeper game":
"Minimal steps down to 1":
"Minimum multiple of m where digital sum equals m":
"Minimum positive multiple in base 10 using only 0 and 1":
"Minkowski question-mark function":
"Möbius function":
"Modified random distribution":
"Modular arithmetic":
"Modular exponentiation":
"Modular inverse":
"Monads/List monad":
"Monads/Maybe monad":
"Monads/Writer monad":
"Monte Carlo methods":
"Monty Hall problem":
"Morse code":
"Motzkin numbers":
"Mouse position":
"Move-to-front algorithm":
"Multi-base primes":
"Multi-dimensional array":
"Multifactorial":
"Multiple distinct objects":
"Multiple regression":
"Multiplication tables":
"Multiplicative order":
"Multisplit":
"Munchausen numbers":
"Munching squares":
"Musical scale":
"Mutex":
"Mutual recursion":
"Named parameters":
"Naming conventions":
"Narcissist":
"Narcissistic decimal number":
"Natural sorting":
"Nautical bell":
"Negative base numbers":
"Nested function":
"Nested templated data":
"Next highest int from digits":
"Nim game":
"Non-continuous subsequences":
"Non-decimal radices/Convert":
"Non-decimal radices/Input":
"Non-decimal radices/Output":
"Nonoblock":
"Nonogram solver":
"Non-transitive dice":
"N-queens problem":
"N-smooth numbers":
"N'th":
"Nth root":
"Null object":
"Number names":
"Number reversal game":
"Numbers which are not the sum of distinct squares":
"Numbers which are the cube roots of the product of their proper divisors":
"Numbers with equal rises and falls":
"Numerical and alphabetical suffixes":
"Numerical integration":
"Numerical integration/Gauss-Legendre Quadrature":
"Numeric error propagation":
"Object serialization":
"Odd word problem":
"Old lady swallowed a fly":
"Old Russian measure of length":
"OLE automation":
"One-dimensional cellular automata":
"One of n lines in a file":
"One-time pad":
"OpenGL":
"OpenWebNet password":
"Operator precedence":
"Optional parameters":
"Order by pair comparisons":
"Order disjoint list items":
"Ordered partitions":
"Ordered words":
"Order two numerical lists":
"Ormiston triples":
"Own digits power sum":
"P-Adic numbers, basic":
"P-Adic square roots":
"Padovan n-step number sequences":
"Padovan sequence":
"Palindrome dates":
"Palindrome detection":
"Palindromic gapful numbers":
"Pancake numbers":
"Pangram checker":
"Paraffins":
"Parallel brute force":
"Parallel calculations":
"Parameterized SQL statement":
"Parametric polymorphism":
"Parse an IP Address":
"Parsing/RPN calculator algorithm":
"Parsing/RPN to infix conversion":
"Parsing/Shunting-yard algorithm":
"Partial function application":
"Particle fountain":
"Partition an integer x into n primes":
"Partition function P":
"Pascal matrix generation":
"Pascal's triangle":
"Pascal's triangle/Puzzle":
"Password generator":
"Pathological floating point problems":
"Peaceful chess queen armies":
"Peano curve":
"Pell numbers":
"Pell's equation":
"Penney's game":
"Pentagram":
"Pentomino tiling":
"Percentage difference between images":
"Percolation/Bond percolation":
"Percolation/Mean cluster density":
"Percolation/Mean run density":
"Percolation/Site percolation":
"Perfect numbers":
"Perfect shuffle":
"Perfect totient numbers":
"Periodic table":
"Peripheral drift illusion":
"Perlin noise":
"Permutations":
"Permutations by swapping":
"Permutations/Derangements":
"Permutations/Rank of a permutation":
"Permutation test":
"Pernicious numbers":
"Phrase reversals":
"Pi":
"Pick random element":
"Pierpont primes":
"Pig the dice game":
"Pig the dice game/Player":
"Pinstripe/Display":
"Pinstripe/Printer":
"Pisano period":
"Plasma effect":
"Playfair cipher":
"Playing cards":
"Play recorded sounds":
"Plot coordinate pairs":
"Pointers and references":
"Poker hand analyser":
"Polymorphic copy":
"Polymorphism":
"Polynomial long division":
"Polynomial regression":
"Polyspiral":
"Population count":
"Power set":
"Pragmatic directives":
"Price fraction":
"Primality by trial division":
"Primality by Wilson's theorem":
"Prime conspiracy":
"Prime decomposition":
"Prime numbers whose neighboring pairs are tetraprimes":
"Primes - allocate descendants to their ancestors":
"Prime triangle":
"Primorial numbers":
"Priority queue":
"Probabilistic choice":
"Problem of Apollonius":
"Program name":
"Program termination":
"Proper divisors":
"Pseudo-random numbers/Combined recursive generator MRG32k3a":
"Pseudo-random numbers/Middle-square method":
"Pseudo-random numbers/PCG32":
"Pseudo-random numbers/Splitmix64":
"Pseudo-random numbers/Xorshift star":
"P-value correction":
"Pythagoras tree":
"Pythagorean quadruples":
"Pythagorean triples":
"QR decomposition":
"Quaternion type":
"Queue/Definition":
"Queue/Usage":
"Quickselect algorithm":
"Quine":
"Quoting constructs":
"Radical of an integer":
"Ramanujan primes/twins":
"Ramanujan's constant":
"Ramer-Douglas-Peucker line simplification":
"Random Latin squares":
"Random number generator (device)":
"Random number generator (included)":
"Random numbers":
"Random sentence from book":
"Range consolidation":
"Range expansion":
"Range extraction":
"Ranking methods":
"Rare numbers":
"Rate counter":
"Ray-casting algorithm":
"RCRPG":
"Read a configuration file":
"Read a file character by character/UTF8":
"Read a file line by line":
"Read a specific line from a file":
"Read entire file":
"Real constants and functions":
"Recaman's sequence":
"Record sound":
"Reduced row echelon form":
"Reflection/Get source":
"Reflection/List methods":
"Reflection/List properties":
"Regular expressions":
"Remove duplicate elements":
"Remove lines from a file":
"Rename a file":
"Rendezvous":
"Repeat":
"Repeat a string":
"Rep-string":
"Repunit primes":
"Resistor mesh":
"Respond to an unknown method call":
"Retrieve and search chat history":
"Return multiple values":
"Reverse a string":
"Reverse words in a string":
"Rhonda numbers":
"RIPEMD-160":
"Rock-paper-scissors":
"Roman numerals/Decode":
"Roman numerals/Encode":
"Roots of a function":
"Roots of a quadratic function":
"Roots of unity":
"Rosetta Code/Count examples":
"Rosetta Code/Find bare lang tags":
"Rosetta Code/Find unimplemented tasks":
"Rosetta Code/Fix code tags":
"Rosetta Code/Rank languages by number of users":
"Rosetta Code/Rank languages by popularity":
"Rot-13":
"RPG attributes generator":
"RSA code":
"Runge-Kutta method":
"Run-length encoding":
"Runtime evaluation":
"Runtime evaluation/In an environment":
"Ruth-Aaron numbers":
"Safe addition":
"Safe primes and unsafe primes":
"Sailors, coconuts and a monkey problem":
"Same fringe":
"Scope/Function names and labels":
"Scope modifiers":
"Search a list":
"Search a list of records":
"Search in paragraph's text":
"Secure temporary file":
"SEDOLs":
"Selectively replace multiple instances of a character within a string":
"Self-describing numbers":
"Self numbers":
"Semiprime":
"Semordnilap":
"Send an unknown method call":
"Send email":
"Sequence: nth number with exactly n divisors":
"Sequence of non-squares":
"Sequence of primes by trial division":
"Sequence of primorial primes":
"Sequence: smallest number greater than previous term with exactly n divisors":
"Sequence: smallest number with exactly n divisors":
"Set":
"Set consolidation":
"Set of real numbers":
"Set puzzle":
"Set right-adjacent bits":
"Seven-sided dice from five-sided dice":
"S-expressions":
"Sexy primes":
"SHA-1":
"SHA-256":
"SHA-256 Merkle tree":
"Shell one-liner":
"Shoelace formula for polygonal area":
"Short-circuit evaluation":
"Shortest common supersequence":
"Show ASCII table":
"Show the epoch":
"Sierpinski arrowhead curve":
"Sierpinski carpet":
"Sierpinski pentagon":
"Sierpinski square curve":
"Sierpinski triangle":
"Sierpinski triangle/Graphical":
"Sieve of Eratosthenes":
"Sieve of Pritchard":
"Simple database":
"Simple turtle graphics":
"Simple windowed application":
"Simulate input/Keyboard":
"Simulate input/Mouse":
"Singleton":
"Singly-linked list/Element definition":
"Singly-linked list/Element insertion":
"Singly-linked list/Traversal":
"Singular value decomposition":
"Sisyphus sequence":
"Sleep":
"Sleeping Beauty problem":
"Smallest number k such that k+2^m is composite for all m less than k":
"Smarandache prime-digital sequence":
"Smarandache-Wellin primes":
"Smith numbers":
"Snake":
"SOAP":
"Sockets":
"Sokoban":
"Soloway's recurring rainfall":
"Solve a Hidato puzzle":
"Solve a Holy Knight's tour":
"Solve a Hopido puzzle":
"Solve a Numbrix puzzle":
"Solve the no connection puzzle":
"Sort a list of object identifiers":
"Sort an array of composite structures":
"Sort an integer array":
"Sort an outline at every level":
"Sort disjoint sublist":
"Sorting algorithms/Bead sort":
"Sorting algorithms/Bogosort":
"Sorting algorithms/Bubble sort":
"Sorting Algorithms/Circle Sort":
"Sorting algorithms/Cocktail sort":
"Sorting algorithms/Cocktail sort with shifting bounds":
"Sorting algorithms/Comb sort":
"Sorting algorithms/Counting sort":
"Sorting algorithms/Gnome sort":
"Sorting algorithms/Heapsort":
"Sorting algorithms/Insertion sort":
"Sorting algorithms/Merge sort":
"Sorting algorithms/Pancake sort":
"Sorting algorithms/Patience sort":
"Sorting algorithms/Permutation sort":
"Sorting algorithms/Quicksort":
"Sorting algorithms/Radix sort":
"Sorting algorithms/Selection sort":
"Sorting algorithms/Shell sort":
"Sorting algorithms/Sleep sort":
"Sorting algorithms/Stooge sort":
"Sorting algorithms/Strand sort":
"Sort numbers lexicographically":
"Sort stability":
"Sort three variables":
"Sort using a custom comparator":
"Soundex":
"Sparkline in unicode":
"Special characters":
"Special variables":
"Speech synthesis":
"Spelling of ordinal numbers":
"Sphenic numbers":
"Spinning rod animation/Text":
"Spiral matrix":
"Split a character string based on change of character":
"SQL-based authentication":
"Square but not cube":
"Square form factorization":
"Square-free integers":
"Stable marriage problem":
"Stack":
"Stack traces":
"Stair-climbing puzzle":
"Start from a main routine":
"State name puzzle":
"Statistics/Basic":
"Statistics/Normal distribution":
"Steffensen's method":
"Stem-and-leaf plot":
"Stern-Brocot sequence":
"Stirling numbers of the first kind":
"Stirling numbers of the second kind":
"Straddling checkerboard":
"Strassen's algorithm":
"Stream merge":
"String append":
"String case":
"String comparison":
"String concatenation":
"String interpolation (included)":
"String length":
"String matching":
"String prepend":
"Strip a set of characters from a string":
"Strip block comments":
"Strip comments from a string":
"Strip control codes and extended characters from a string":
"Strip whitespace from a string/Top and tail":
"Strong and weak primes":
"Subleq":
"Substitution cipher":
"Substring":
"Substring/Top and tail":
"Subtractive generator":
"Successive prime differences":
"Sudan function":
"Sudoku":
"Suffixation of decimal numbers":
"Sum and product of an array":
"Sum and product puzzle":
"Sum digits of an integer":
"Summarize and say sequence":
"Summarize primes":
"Sum multiples of 3 and 5":
"Sum of a series":
"Sum of elements below main diagonal of matrix":
"Sum of squares":
"Sum to 100":
"Super-d numbers":
"Superellipse":
"Superpermutation minimisation":
"Sutherland-Hodgman polygon clipping":
"Sylvester's sequence":
"Symmetric difference":
"Synchronous concurrency":
"System time":
"Table creation/Postal addresses":
"Take notes on the command line":
"Tarjan":
"Tau function":
"Tau number":
"Taxicab numbers":
"Teacup rim text":
"Temperature conversion":
"Terminal control/Clear the screen":
"Terminal control/Coloured text":
"Terminal control/Cursor movement":
"Terminal control/Cursor positioning":
"Terminal control/Dimensions":
"Terminal control/Display an extended character":
"Terminal control/Hiding the cursor":
"Terminal control/Inverse video":
"Terminal control/Positional read":
"Terminal control/Preserve screen":
"Terminal control/Ringing the terminal bell":
"Terminal control/Unicode output":
"Ternary logic":
"Test a function":
"Test integerness":
"Textonyms":
"Text processing/1":
"Text processing/2":
"Text processing/Max licenses in use":
"The Name Game":
"The sieve of Sundaram":
"The Twelve Days of Christmas":
"Thiele's interpolation formula":
"Thue-Morse":
"Tic-tac-toe":
"Time a function":
"Tokenize a string":
"Tokenize a string with escaping":
"Tonelli-Shanks algorithm":
"Topic variable":
"Topological sort":
"Top rank per group":
"Topswops":
"Total circles area":
"Totient function":
"Towers of Hanoi":
"Trabb Pardo–Knuth algorithm":
"Transliterate English text using the Greek alphabet":
"Tree datastructures":
"Tree from nesting levels":
"Tree traversal":
"Trigonometric functions":
"Tropical algebra overloading":
"Truncatable primes":
"Truncate a file":
"Truth table":
"Twelve statements":
"Twin primes":
"Two bullet roulette":
"Two's complement":
"Ukkonen’s suffix tree construction":
"Ulam spiral (for primes)":
"Ultra useful primes":
"Unbias a random generator":
"Undefined values":
"Unicode strings":
"Unicode variable names":
"Universal Turing machine":
"Unix/ls":
"Unprimeable numbers":
"Untouchable numbers":
"UPC":
"Update a configuration file":
"URL decoding":
"URL encoding":
"URL parser":
"Use another language to call a function":
"User input/Graphical":
"User input/Text":
"UTF-8 encode and decode":
"Validate International Securities Identification Number":
"Vampire number":
"Van der Corput sequence":
"Van Eck sequence":
"Variable declaration reset":
"Variable-length quantity":
"Variables":
"Variable size/Get":
"Variable size/Set":
"Variadic function":
"Vector":
"Vector products":
"Verhoeff algorithm":
"Verify distribution uniformity/Chi-squared test":
"Verify distribution uniformity/Naive":
"Video display modes":
"Vigenère cipher":
"Vigenère cipher/Cryptanalysis":
"Visualize a tree":
"Vogel's approximation method":
"Voronoi diagram":
"Wagstaff primes":
"Walk a directory/Non-recursively":
"Walk a directory/Recursively":
"War card game":
"Wasteful, equidigital and frugal numbers":
"Water collected between towers":
"Web scraping":
"Weird numbers":
"Wieferich primes":
"Wilson primes of order n":
"Window creation":
"Window creation/X11":
"Window management":
"Wireworld":
"Word frequency":
"Wordiff":
"Word ladder":
"Word search":
"Word wheel":
"Word wrap":
"World Cup group stage":
"Write entire file":
"Write float arrays to a text file":
"Write language name in 3D ASCII":
"Write to Windows event log":
"Xiaolin Wu's line algorithm":
"XML/DOM serialization":
"XML/Input":
"XML/Output":
"XML/XPath":
"Yahoo! search interface":
"Y combinator":
"Yellowstone sequence":
"Yin and yang":
"Zebra puzzle":
"Zeckendorf arithmetic":
"Zeckendorf number representation":
"Zero to the zero power":
"Zhang-Suen thinning algorithm":
"Zig-zag matrix":
"Zumkeller numbers":