Micron Document




List of algorithms
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An algorithm is fundamentally a set of rules or defined procedures that is typically designed and used to solve a specific problem or a broad set of problems.

Broadly, algorithms define process(es), sets of rules, or methodologies that are to be followed in calculations, data processing, data mining, pattern recognition, automated reasoning or other problem-solving operations. With the increasing automation of services, more and more decisions are being made by algorithms. Some general examples are; risk assessments, anticipatory policing, and pattern recognition technology.cite-ref-1[1]

The following is a list of well-known algorithms.

Contents

Physics

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Automated planning

Combinatorial algorithms

General combinatorial algorithms

Brent's algorithm: finds a cycle in function value iterations using only two iteratorscite-ref-2[2]
Floyd's cycle-finding algorithm: finds a cycle in function value iterationscite-ref-3[3]
Gale–Shapley algorithm: solves the stable matching problemcite-ref-4[4]cite-ref-5[5]cite-ref-6[6]
Pseudorandom number generators (uniformly distributed—see also List of pseudorandom number generators for other PRNGs with varying degrees of convergence and varying statistical quality):


Graph algorithms

Coloring algorithm: Graph coloring algorithm.
Hopcroft–Karp algorithm: convert a bipartite graph to a maximum cardinality matching
Hungarian algorithm: algorithm for finding a perfect matching
Prüfer coding: conversion between a labeled tree and its Prüfer sequence
Topological sort: finds linear order of nodes (e.g. jobs) based on their dependencies.

Graph drawing

Force-based algorithms (also known as force-directed algorithms or spring-based algorithm)

Network theory

• Network analysis

• Link analysis

Girvan–Newman algorithm: detect communities in complex systems
• Web link analysis



Dinic's algorithm: is a strongly polynomial algorithm for computing the maximum flow in a flow network.
Edmonds–Karp algorithm: implementation of Ford–Fulkerson
Ford–Fulkerson algorithm: computes the maximum flow in a graph
Karger's algorithm: a Monte Carlo method to compute the minimum cut of a connected graph
Push–relabel algorithm: computes a maximum flow in a graph

Routing for graphs

Edmonds' algorithm (also known as Chu–Liu/Edmonds' algorithm): find maximum or minimum branchings
Euclidean minimum spanning tree: algorithms for computing the minimum spanning tree of a set of points in the plane
Longest path problem: find a simple path of maximum length in a given graph



Bellman–Ford algorithm: computes shortest paths in a weighted graph (where some of the edge weights may be negative)
Dijkstra's algorithm: computes shortest paths in a graph with non-negative edge weights
Floyd–Warshall algorithm: solves the all pairs shortest path problem in a weighted, directed graph
Johnson's algorithm: all pairs shortest path algorithm in sparse weighted directed graph

Transitive closure problem: find the transitive closure of a given binary relation



• Clarke and Wright Saving algorithm

Warnsdorff's rule: a heuristic method for solving the Knight's tour problem

Graph search

A*: special case of best-first search that uses heuristics to improve speed
B*: a best-first graph search algorithm that finds the least-cost path from a given initial node to any goal node (out of one or more possible goals)
Backtracking: abandons partial solutions when they are found not to satisfy a complete solution
Beam search: is a heuristic search algorithm that is an optimization of best-first search that reduces its memory requirement
Beam stack search: integrates backtracking with beam search
Best-first search: traverses a graph in the order of likely importance using a priority queue
Bidirectional search: find the shortest path from an initial vertex to a goal vertex in a directed graph
Breadth-first search: traverses a graph level by level
Brute-force search: an exhaustive and reliable search method, but computationally inefficient in many applications
Depth-first search: traverses a graph branch by branch
Dijkstra's algorithm: a special case of A* for which no heuristic function is used
General Problem Solver: a seminal theorem-proving algorithm intended to work as a universal problem solver machine.
Iterative deepening depth-first search (IDDFS): a state space search strategy
Jump point search: an optimization to A* which may reduce computation time by an order of magnitude using further heuristics
Lexicographic breadth-first search (also known as Lex-BFS): a linear time algorithm for ordering the vertices of a graph
SSS*: state space search traversing a game tree in a best-first fashion similar to that of the A* search algorithm
Uniform-cost search: a tree search that finds the lowest-cost route where costs vary

Subgraphs
Sequence algorithms

Approximate sequence matching

Bitap algorithm: fuzzy algorithm that determines if strings are approximately equal.

Daitch–Mokotoff Soundex: a Soundex refinement which allows matching of Slavic and Germanic surnames
Double Metaphone: an improvement on Metaphone
Match rating approach: a phonetic algorithm developed by Western Airlines
Metaphone: an algorithm for indexing words by their sound, when pronounced in English
NYSIIS: phonetic algorithm, improves on Soundex
Soundex: a phonetic algorithm for indexing names by sound, as pronounced in English

String metrics: computes a similarity or dissimilarity (distance) score between two pairs of text strings

Damerau–Levenshtein distance: computes a distance measure between two strings, improves on Levenshtein distance
Dice's coefficient (also known as the Dice coefficient): a similarity measure related to the Jaccard index
Hamming distance: sum number of positions which are different
Jaro–Winkler distance: is a measure of similarity between two strings
Levenshtein edit distance: computes a metric for the amount of difference between two sequences

Trigram search: search for text when the exact syntax or spelling of the target object is not precisely known

Selection algorithms
Sequence search

Linear search: locates an item in an unsorted sequence
Selection algorithm: finds the kth largest item in a sequence

Binary search algorithm: locates an item in a sorted sequence
Eytzinger binary search: cache friendly binary search algorithm cite-ref-7[7]
Fibonacci search technique: search a sorted sequence using a divide and conquer algorithm that narrows down possible locations with the aid of Fibonacci numbers
Jump search (or block search): linear search on a smaller subset of the sequence
Predictive search: binary-like search which factors in magnitude of search term versus the high and low values in the search. Sometimes called dictionary search or interpolated search.
Uniform binary search: an optimization of the classic binary search algorithm

Ternary search: a technique for finding the minimum or maximum of a function that is either strictly increasing and then strictly decreasing or vice versa

Sequence merging

• Simple merge algorithm
• Union (merge, with elements on the output not repeated)

Sequence permutations

Fisher–Yates shuffle (also known as the Knuth shuffle): randomly shuffle a finite set
Heap's permutation generation algorithm: interchange elements to generate next permutation
Schensted algorithm: constructs a pair of Young tableaux from a permutation
Steinhaus–Johnson–Trotter algorithm (also known as the Johnson–Trotter algorithm): generates permutations by transposing elements

Sequence combinations

Sequence alignment

Dynamic time warping: measure similarity between two sequences which may vary in time or speed
Hirschberg's algorithm: finds the least cost sequence alignment between two sequences, as measured by their Levenshtein distance
Needleman–Wunsch algorithm: find global alignment between two sequences
Smith–Waterman algorithm: find local sequence alignment

Sequence sorting

• Exchange sorts

Bubble sort: for each pair of indices, swap the items if out of order
Cocktail shaker sort or bidirectional bubble sort, a bubble sort traversing the list alternately from front to back and back to front
Quicksort: divide list into two, with all items on the first list coming before all items on the second list.; then sort the two lists. Often the method of choice

• Humorous or ineffective

Bogosort: the list is randomly shuffled until it happens to be sorted
Stalin sort: all elements that are not in order are removed from the listcite-ref-8[8]

• Hybrid

Introsort: begin with quicksort and switch to heapsort when the recursion depth exceeds a certain level
Timsort: adaptative algorithm derived from merge sort and insertion sort. Used in Python 2.3 and up, and Java SE 7.

• Insertion sorts

Cycle sort: in-place with theoretically optimal number of writes
Insertion sort: determine where the current item belongs in the list of sorted ones, and insert it there
Shell sort: an attempt to improve insertion sort
Tree sort (binary tree sort): build binary tree, then traverse it to create sorted list

• Merge sorts

Merge sort: sort the first and second half of the list separately, then merge the sorted lists

• Non-comparison sorts

Burstsort: build a compact, cache efficient burst trie and then traverse it to create sorted output
Postman sort: variant of Bucket sort which takes advantage of hierarchical structure
Radix sort: sorts strings letter by letter

• Selection sorts

Heapsort: convert the list into a heap, keep removing the largest element from the heap and adding it to the end of the list
Selection sort: pick the smallest of the remaining elements, add it to the end of the sorted list

• Other


• Unknown class


Subsequences

Longest common subsequence problem: Find the longest subsequence common to all sequences in a set of sequences
Longest increasing subsequence problem: Find the longest increasing subsequence of a given sequence
Ruzzo–Tompa algorithm: Find all non-overlapping, contiguous, maximal scoring subsequences in a sequence of real numbers
Shortest common supersequence problem: Find the shortest supersequence that contains two or more sequences as subsequences

Substrings

Kadane's algorithm: finds the contiguous subarray with largest sum in an array of numbers
Longest common substring problem: find the longest string (or strings) that is a substring (or are substrings) of two or more strings

Krauss matching wildcards algorithm: an open-source non-recursive algorithm
Rich Salz' wildmat: a widely used open-source recursive algorithm


Aho–Corasick string matching algorithm: trie based algorithm for finding all substring matches to any of a finite set of strings
Boyer–Moore–Horspool algorithm: Simplification of Boyer–Moore
Boyer–Moore string-search algorithm: amortized linear (sublinear in most times) algorithm for substring search
Knuth–Morris–Pratt algorithm: substring search which bypasses reexamination of matched characters
Rabin–Karp string search algorithm: searches multiple patterns efficiently
Zhu–Takaoka string matching algorithm: a variant of Boyer–Moore


Computational mathematics

Abstract algebra

Chien search: a recursive algorithm for determining roots of polynomials defined over a finite field
Todd–Coxeter algorithm: Procedure for generating cosets.

Computer algebra

Cantor–Zassenhaus algorithm: factor polynomials over finite fields
Faugère F4 algorithm: finds a Gröbner basis (also mentions the F5 algorithm)
Gosper's algorithm: find sums of hypergeometric terms that are themselves hypergeometric terms
Multivariate division algorithm: for polynomials in several indeterminates
Pollard's kangaroo algorithm (also known as Pollard's lambda algorithm): an algorithm for solving the discrete logarithm problem
Polynomial long division: an algorithm for dividing a polynomial by another polynomial of the same or lower degree
Risch algorithm: an algorithm for the calculus operation of indefinite integration (i.e. finding antiderivatives)

Geometry

Closest pair problem: find the pair of points (from a set of points) with the smallest distance between them
Collision detection algorithms: check for the collision or intersection of two given solids
Cone algorithm: identify surface points
Convex hull algorithms: determining the convex hull of a set of points

Gift wrapping algorithm or Jarvis march

Euclidean distance transform: computes the distance between every point in a grid and a discrete collection of points.
Geometric hashing: a method for efficiently finding two-dimensional objects represented by discrete points that have undergone an affine transformation
Gilbert–Johnson–Keerthi distance algorithm: determining the smallest distance between two convex shapes.
Jump-and-Walk algorithm: an algorithm for point location in triangulations
Laplacian smoothing: an algorithm to smooth a polygonal mesh
Line segment intersection: finding whether lines intersect, usually with a sweep line algorithm

• Shamos–Hoey algorithm

Minimum bounding box algorithms: find the oriented minimum bounding box enclosing a set of points
Nearest neighbor search: find the nearest point or points to a query point
Nesting algorithm: make the most efficient use of material or space
Point in polygon algorithms: tests whether a given point lies within a given polygon
Point set registration algorithms: finds the transformation between two point sets to optimally align them.
Rotating calipers: determine all antipodal pairs of points and vertices on a convex polygon or convex hull.
Shoelace algorithm: determine the area of a polygon whose vertices are described by ordered pairs in the plane


Ruppert's algorithm (also known as Delaunay refinement): create quality Delaunay triangulations

Marching triangles: reconstruct two-dimensional surface geometry from an unstructured point cloud
Polygon triangulation algorithms: decompose a polygon into a set of triangles

Bowyer–Watson algorithm: create voronoi diagram in any number of dimensions
Fortune's Algorithm: create voronoi diagram

Number theoretic algorithms

Binary GCD algorithm: Efficient way of calculating GCD.
Chakravala method: a cyclic algorithm to solve indeterminate quadratic equations, including Pell's equation


Extended Euclidean algorithm: also solves the equation ax + by = c
Integer factorization: breaking an integer into its prime factors


Lenstra–Lenstra–Lovász algorithm (also known as LLL algorithm): find a short, nearly orthogonal lattice basis in polynomial time
Modular square root: computing square roots modulo a prime number


Multiplication algorithms: fast multiplication of two numbers


Odlyzko–Schönhage algorithm: calculates nontrivial zeroes of the Riemann zeta function
Primality tests: determining whether a given number is prime


Numerical algorithms

Differential equation solving

Multigrid methods (MG methods), a group of algorithms for solving differential equations using a hierarchy of discretizations

Crank–Nicolson method for diffusion equations
Lax–Wendroff for wave equations



Verlet integration (French pronunciation: [vɛʁˈlɛ]): integrate Newton's equations of motion

Elementary and special functions


Bailey–Borwein–Plouffe formula: (BBP formula) a spigot algorithm for the computation of the nth binary digit of π
Borwein's algorithm: an algorithm to calculate the value of 1/π
Chudnovsky algorithm: a fast method for calculating the digits of π
Gauss–Legendre algorithm: computes the digits of pi

Division algorithms: for computing quotient and/or remainder of two numbers

Newton–Raphson division: uses Newton's method to find the reciprocal of D, and multiply that reciprocal by N to find the final quotient Q.

• Exponentiation:

Addition-chain exponentiation: exponentiation by positive integer powers that requires a minimal number of multiplications
Exponentiating by squaring: an algorithm used for the fast computation of large integer powers of a number

• Hyperbolic and Trigonometric Functions:

BKM algorithm: computes elementary functions using a table of logarithms
CORDIC: computes hyperbolic and trigonometric functions using a table of arctangents

Montgomery reduction: an algorithm that allows modular arithmetic to be performed efficiently when the modulus is large
Multiplication algorithms: fast multiplication of two numbers

Booth's multiplication algorithm: a multiplication algorithm that multiplies two signed binary numbers in two's complement notation
Fürer's algorithm: an integer multiplication algorithm for very large numbers possessing a very low asymptotic complexity
Karatsuba algorithm: an efficient procedure for multiplying large numbers
Schönhage–Strassen algorithm: an asymptotically fast multiplication algorithm for large integers
Toom–Cook multiplication: (Toom3) a multiplication algorithm for large integers

Multiplicative inverse Algorithms: for computing a number's multiplicative inverse (reciprocal).


Rounding functions: the classic ways to round numbers
Spigot algorithm: a way to compute the value of a mathematical constant without knowing preceding digits
• Square and Nth root of a number:

Alpha max plus beta min algorithm: an approximation of the square-root of the sum of two squares

• Summation:

Binary splitting: a divide and conquer technique which speeds up the numerical evaluation of many types of series with rational terms
Kahan summation algorithm: a more accurate method of summing floating-point numbers


Geometric

Filtered back-projection: efficiently computes the inverse 2-dimensional Radon transform.
Level set method (LSM): a numerical technique for tracking interfaces and shapes

Interpolation and extrapolation

Birkhoff interpolation: an extension of polynomial interpolation
Linear interpolation: a method of curve fitting using linear polynomials
Monotone cubic interpolation: a variant of cubic interpolation that preserves monotonicity of the data set being interpolated.

Bicubic interpolation: a generalization of cubic interpolation to two dimensions
Bilinear interpolation: an extension of linear interpolation for interpolating functions of two variables on a regular grid
Lanczos resampling ("Lanzosh"): a multivariate interpolation method used to compute new values for any digitally sampled data
Tricubic interpolation: a generalization of cubic interpolation to three dimensions

Pareto interpolation: a method of estimating the median and other properties of a population that follows a Pareto distribution.


Spline interpolation: Reduces error with Runge's phenomenon.



Linear algebra



Gram–Schmidt process: orthogonalizes a set of vectors
• Krylov methods (for large sparse matrix problems; third most-important numerical method class of the 20th century as ranked by SISC; after fast-fourier and fast-multipole)

Cannon's algorithm: a distributed algorithm for matrix multiplication especially suitable for computers laid out in an N × N mesh
Freivalds' algorithm: a randomized algorithm used to verify matrix multiplication


Biconjugate gradient method: solves systems of linear equations
Conjugate gradient: an algorithm for the numerical solution of particular systems of linear equations
Gauss–Jordan elimination: solves systems of linear equations
Gauss–Seidel method: solves systems of linear equations iteratively
Levinson recursion: solves equation involving a Toeplitz matrix
Stone's method: also known as the strongly implicit procedure or SIP, is an algorithm for solving a sparse linear system of equations
Successive over-relaxation (SOR): method used to speed up convergence of the Gauss–Seidel method
Tridiagonal matrix algorithm (Thomas algorithm): solves systems of tridiagonal equations

Sparse matrix algorithms

Minimum degree algorithm: permute the rows and columns of a symmetric sparse matrix before applying the Cholesky decomposition
Symbolic Cholesky decomposition: Efficient way of storing sparse matrix

Monte Carlo

Gibbs sampling: generates a sequence of samples from the joint probability distribution of two or more random variables
Hybrid Monte Carlo: generates a sequence of samples using Hamiltonian weighted Markov chain Monte Carlo, from a probability distribution which is difficult to sample directly.
Metropolis–Hastings algorithm: used to generate a sequence of samples from the probability distribution of one or more variables

Numerical integration

MISER algorithm: Monte Carlo simulation, numerical integration

Root finding

False position method: and Illinois method: 2-point, bracketing
Halley's method: uses first and second derivatives
ITP method: minmax optimal and superlinear convergence simultaneously
Muller's method: 3-point, quadratic interpolation
Newton's method: finds zeros of functions with calculus
Ridder's method: 3-point, exponential scaling
Secant method: 2-point, 1-sided

Optimization algorithms

Hybrid Algorithms

Alpha–beta pruning: search to reduce number of nodes in minimax algorithm
• A hybrid BFGS-Like method (see more https://doi.org/10.1016/j.cam.2024.115857)
Combinatorial optimization: optimization problems where the set of feasible solutions is discrete

Greedy randomized adaptive search procedure (GRASP): successive constructions of a greedy randomized solution and subsequent iterative improvements of it through a local search
Hungarian method: a combinatorial optimization algorithm which solves the assignment problem in polynomial time

Conjugate gradient methods (see more https://doi.org/10.1016/j.jksus.2022.101923)

AC-3 algorithm general algorithms for the constraint satisfaction
Chaff algorithm: an algorithm for solving instances of the Boolean satisfiability problem
Davis–Putnam algorithm: check the validity of a first-order logic formula
Difference map algorithm general algorithms for the constraint satisfaction
Davis–Putnam–Logemann–Loveland algorithm (DPLL): an algorithm for deciding the satisfiability of propositional logic formula in conjunctive normal form, i.e. for solving the CNF-SAT problem
Exact cover problem
Min conflicts algorithm general algorithms for the constraint satisfaction

Dancing Links: an efficient implementation of Algorithm X

Cross-entropy method: a general Monte Carlo approach to combinatorial and continuous multi-extremal optimization and importance sampling
Dynamic Programming: problems exhibiting the properties of overlapping subproblems and optimal substructure
Ellipsoid method: is an algorithm for solving convex optimization problems
Evolutionary computation: optimization inspired by biological mechanisms of evolution


Fitness proportionate selection – also known as roulette-wheel selection


Bees algorithm: a search algorithm which mimics the food foraging behavior of swarms of honey bees

Frank-Wolfe algorithm: an iterative first-order optimization algorithm for constrained convex optimization
Golden-section search: an algorithm for finding the maximum of a real function
Harmony search (HS): a metaheuristic algorithm mimicking the improvisation process of musicians
• A hybrid HS-LS conjugate gradient algorithm (see https://doi.org/10.1016/j.cam.2023.115304)

Benson's algorithm: an algorithm for solving linear vector optimization problems
Dantzig–Wolfe decomposition: an algorithm for solving linear programming problems with special structure
Integer linear programming: solve linear programming problems where some or all the unknowns are restricted to integer values


Karmarkar's algorithm: The first reasonably efficient algorithm that solves the linear programming problem in polynomial time.
Simplex algorithm: an algorithm for solving linear programming problems

Local search: a metaheuristic for solving computationally hard optimization problems


Minimax used in game programming
Nearest neighbor search (NNS): find closest points in a metric space

Best Bin First: find an approximate solution to the nearest neighbor search problem in very-high-dimensional spaces


Gauss–Newton algorithm: an algorithm for solving nonlinear least squares problems
Levenberg–Marquardt algorithm: an algorithm for solving nonlinear least squares problems
Nelder–Mead method (downhill simplex method): a nonlinear optimization algorithm

Odds algorithm (Bruss algorithm): Finds the optimal strategy to predict a last specific event in a random sequence event
Subset sum algorithm

Computational science

Astronomy

Doomsday algorithm: day of the week
• various Easter algorithms are used to calculate the day of Easter
Zeller's congruence is an algorithm to calculate the day of the week for any Julian or Gregorian calendar date

Bioinformatics

Basic Local Alignment Search Tool also known as BLAST: an algorithm for comparing primary biological sequence information
Bloom Filter: probabilistic data structure used to test for the existence of an element within a set. Primarily used in bioinformatics to test for the existence of a k-mer in a sequence or sequences.
Kabsch algorithm: calculate the optimal alignment of two sets of points in order to compute the root mean squared deviation between two protein structures.
Maximum parsimony (phylogenetics): an algorithm for finding the simplest phylogenetic tree to explain a given character matrix.
• Sorting by signed reversals: an algorithm for understanding genomic evolution.
UPGMA: a distance-based phylogenetic tree construction algorithm.
Velvet: a set of algorithms manipulating de Bruijn graphs for genomic sequence assembly

Geoscience

Geohash: a public domain algorithm that encodes a decimal latitude/longitude pair as a hash string
Vincenty's formulae: a fast algorithm to calculate the distance between two latitude/longitude points on an ellipsoid

Linguistics

Lesk algorithm: word sense disambiguation
Stemming algorithm: a method of reducing words to their stem, base, or root form
Sukhotin's algorithm: a statistical classification algorithm for classifying characters in a text as vowels or consonants

Medicine

ESC algorithm for the diagnosis of heart failure
Manning Criteria for irritable bowel syndrome
Pulmonary embolism diagnostic algorithms

Physics

Constraint algorithm: a class of algorithms for satisfying constraints for bodies that obey Newton's equations of motion
Demon algorithm: a Monte Carlo method for efficiently sampling members of a microcanonical ensemble with a given energy
Featherstone's algorithm: computes the effects of forces applied to a structure of joints and links
Glauber dynamics: a method for simulating the Ising Model on a computer
Ground state approximation




Barnes–Hut simulation: Solves the n-body problem in an approximate way that has the order O(n log n) instead of O(n2) as in a direct-sum simulation.
Fast multipole method (FMM): speeds up the calculation of long-ranged forces

Rainflow-counting algorithm: Reduces a complex stress history to a count of elementary stress-reversals for use in fatigue analysis
Sweep and prune: a broad phase algorithm used during collision detection to limit the number of pairs of solids that need to be checked for collision
VEGAS algorithm: a method for reducing error in Monte Carlo simulations

Statistics

Algorithms for calculating variance: avoiding instability and numerical overflow
Approximate counting algorithm: allows counting large number of events in a small register

Nested sampling algorithm: a computational approach to the problem of comparing models in Bayesian statistics


Average-linkage clustering: a simple agglomerative clustering algorithm
Canopy clustering algorithm: an unsupervised pre-clustering algorithm related to the K-means algorithm
Complete-linkage clustering: a simple agglomerative clustering algorithm
DBSCAN: a density based clustering algorithm
Fuzzy clustering: a class of clustering algorithms where each point has a degree of belonging to clusters

FLAME clustering (Fuzzy clustering by Local Approximation of MEmberships): define clusters in the dense parts of a dataset and perform cluster assignment solely based on the neighborhood relationships among objects

k-means clustering: cluster objects based on attributes into partitions
k-means++: a variation of this, using modified random seeds
k-medoids: similar to k-means, but chooses datapoints or medoids as centers
KHOPCA clustering algorithm: a local clustering algorithm, which produces hierarchical multi-hop clusters in static and mobile environments.
Linde–Buzo–Gray algorithm: a vector quantization algorithm to derive a good codebook
Lloyd's algorithm (Voronoi iteration or relaxation): group data points into a given number of categories, a popular algorithm for k-means clustering
OPTICS: a density based clustering algorithm with a visual evaluation method
Single-linkage clustering: a simple agglomerative clustering algorithm
SUBCLU: a subspace clustering algorithm
WACA clustering algorithm: a local clustering algorithm with potentially multi-hop structures; for dynamic networks
Ward's method: an agglomerative clustering algorithm, extended to more general Lance–Williams algorithms


Expectation-maximization algorithm A class of related algorithms for finding maximum likelihood estimates of parameters in probabilistic models


Kalman filter: estimate the state of a linear dynamic system from a series of noisy measurements
Odds algorithm (Bruss algorithm) Optimal online search for distinguished value in sequential random input


Baum–Welch algorithm: computes maximum likelihood estimates and posterior mode estimates for the parameters of a hidden Markov model
Forward-backward algorithm: a dynamic programming algorithm for computing the probability of a particular observation sequence
Viterbi algorithm: find the most likely sequence of hidden states in a hidden Markov model

Partial least squares regression: finds a linear model describing some predicted variables in terms of other observable variables

Buzen's algorithm: an algorithm for calculating the normalization constant G(K) in the Gordon–Newell theorem

RANSAC (an abbreviation for "RANdom SAmple Consensus"): an iterative method to estimate parameters of a mathematical model from a set of observed data which contains outliers
Scoring algorithm: is a form of Newton's method used to solve maximum likelihood equations numerically
Yamartino method: calculate an approximation to the standard deviation σθ of wind direction θ during a single pass through the incoming data
Ziggurat algorithm: generates random numbers from a non-uniform distribution

Computer science

Computer architecture

Tomasulo algorithm: allows sequential instructions that would normally be stalled due to certain dependencies to execute non-sequentially

Computer graphics




• Polygon clipping

Vatti


Marching cubes: extract a polygonal mesh of an isosurface from a three-dimensional scalar field (sometimes called voxels)
Marching squares: generates contour lines for a two-dimensional scalar field
Marching tetrahedrons: an alternative to Marching cubes

• Discrete Green's theorem: is an algorithm for computing double integral over a generalized rectangular domain in constant time. It is a natural extension to the summed area table algorithm
Flood fill: fills a connected region of a multi-dimensional array with a specified symbol
Global illumination algorithms: Considers direct illumination and reflection from other objects.


Hidden-surface removal or visual surface determination

Newell's algorithm: eliminate polygon cycles in the depth sorting required in hidden-surface removal
Painter's algorithm: detects visible parts of a 3-dimensional scenery
Scanline rendering: constructs an image by moving an imaginary line over the image

Line drawing: graphical algorithm for approximating a line segment on discrete graphical media.

Bresenham's line algorithm: plots points of a 2-dimensional array to form a straight line between 2 specified points (uses decision variables)
DDA line algorithm: plots points of a 2-dimensional array to form a straight line between specified points
Xiaolin Wu's line algorithm: algorithm for line antialiasing.

Midpoint circle algorithm: an algorithm used to determine the points needed for drawing a circle
Ramer–Douglas–Peucker algorithm: Given a 'curve' composed of line segments to find a curve not too dissimilar but that has fewer points

Gouraud shading: an algorithm to simulate the differing effects of light and colour across the surface of an object in 3D computer graphics
Phong shading: an algorithm to interpolate surface normal-vectors for surface shading in 3D computer graphics

Slerp (spherical linear interpolation): quaternion interpolation for the purpose of animating 3D rotation
Summed area table (also known as an integral image): an algorithm for computing the sum of values in a rectangular subset of a grid in constant time

Cryptography


ElGamal
• MAE1
RSA

Digital signatures (asymmetric authentication):

DSA, and its variants:

ECDSA and Deterministic ECDSA
EdDSA (Ed25519)

RSA

Cryptographic hash functions (see also the section on message authentication codes):

BLAKE
MD5 – Note that there is now a method of generating collisions for MD5
SHA-1 – Note that there is now a method of generating collisions for SHA-1
SHA-2 (SHA-224, SHA-256, SHA-384, SHA-512)
SHA-3 (SHA3-224, SHA3-256, SHA3-384, SHA3-512, SHAKE128, SHAKE256)
Tiger (TTH), usually used in Tiger tree hashes


Blum Blum Shub – based on the hardness of factorization
Fortuna, intended as an improvement on Yarrow algorithm
Linear-feedback shift register (note: many LFSR-based algorithms are weak or have been broken)




Argon2
bcrypt
PBKDF2
scrypt

Message authentication codes (symmetric authentication algorithms, which take a key as a parameter):

HMAC: keyed-hash message authentication
SipHash

Secret sharing, secret splitting, key splitting, M of N algorithms

• Blakey's scheme


Advanced Encryption Standard (AES), winner of NIST competition, also known as Rijndael
ChaCha20 updated variant of Salsa20
Data Encryption Standard (DES), sometimes DE Algorithm, winner of NBS selection competition, replaced by AES for most purposes
IDEA
Salsa20
Twofish


Digital logic

• Boolean minimization

Espresso heuristic logic minimizer: a fast algorithm for Boolean function minimization
Petrick's method: another algorithm for Boolean simplification
Quine–McCluskey algorithm: also called as Q-M algorithm, programmable method for simplifying the Boolean equations

Machine learning and statistical classification

Almeida–Pineda recurrent backpropagation: Adjust a matrix of synaptic weights to generate desired outputs given its inputs
ALOPEX: a correlation-based machine-learning algorithm
Association rule learning: discover interesting relations between variables, used in data mining


Boosting (meta-algorithm): Use many weak learners to boost effectiveness

AdaBoost: adaptive boosting
BrownBoost: a boosting algorithm that may be robust to noisy datasets

Bootstrap aggregating (bagging): technique to improve stability and classification accuracy
Clustering: a class of unsupervised learning algorithms for grouping and bucketing related input vector

Grabcut based on Graph cuts


C4.5 algorithm: an extension to ID3
ID3 algorithm (Iterative Dichotomiser 3): use heuristic to generate small decision trees

k-nearest neighbors (k-NN): a non-parametric method for classifying objects based on closest training examples in the feature space
Linde–Buzo–Gray algorithm: a vector quantization algorithm used to derive a good codebook
Locality-sensitive hashing (LSH): a method of performing probabilistic dimension reduction of high-dimensional data

Backpropagation: a supervised learning method which requires a teacher that knows, or can calculate, the desired output for any given input
Hopfield net: a Recurrent neural network in which all connections are symmetric
Perceptron: the simplest kind of feedforward neural network: a linear classifier.
Pulse-coupled neural networks (PCNN): Neural models proposed by modeling a cat's visual cortex and developed for high-performance biomimetic image processing.
Radial basis function network: an artificial neural network that uses radial basis functions as activation functions
Self-organizing map: an unsupervised network that produces a low-dimensional representation of the input space of the training samples

Random forest: classify using many decision trees

Q-learning: learns an action-value function that gives the expected utility of taking a given action in a given state and following a fixed policy thereafter

Relevance-Vector Machine (RVM): similar to SVM, but provides probabilistic classification
Supervised learning: Learning by examples (labelled data-set split into training-set and test-set)
Support Vector Machine (SVM): a set of methods which divide multidimensional data by finding a dividing hyperplane with the maximum margin between the two sets

Structured SVM: allows training of a classifier for general structured output labels.

Winnow algorithm: related to the perceptron, but uses a multiplicative weight-update scheme

Programming language theory

• C3 linearization: an algorithm used primarily to obtain a consistent linearization of a multiple inheritance hierarchy in object-oriented programming
Chaitin's algorithm: a bottom-up, graph coloring register allocation algorithm that uses cost/degree as its spill metric
Rete algorithm: an efficient pattern matching algorithm for implementing production rule systems
Sethi-Ullman algorithm: generates optimal code for arithmetic expressions

Parsing

CYK algorithm: an O(n3) algorithm for parsing context-free grammars in Chomsky normal form
Earley parser: another O(n3) algorithm for parsing any context-free grammar
GLR parser: an algorithm for parsing any context-free grammar by Masaru Tomita. It is tuned for deterministic grammars, on which it performs almost linear time and O(n3) in worst case.
Inside-outside algorithm: an O(n3) algorithm for re-estimating production probabilities in probabilistic context-free grammars
LL parser: a relatively simple linear time parsing algorithm for a limited class of context-free grammars
LR parser: A more complex linear time parsing algorithm for a larger class of context-free grammars. Variants:


Recursive descent parser: a top-down parser suitable for LL(k) grammars
Shunting-yard algorithm: converts an infix-notation math expression to postfix

Quantum algorithms

Deutsch–Jozsa algorithm: criterion of balance for Boolean function
Grover's algorithm: provides quadratic speedup for many search problems
Shor's algorithm: provides exponential speedup (relative to currently known non-quantum algorithms) for factoring a number
Simon's algorithm: provides a provably exponential speedup (relative to any non-quantum algorithm) for a black-box problem

Theory of computation and automata
Information theory and signal processing

Coding theory

Error detection and correction



BCJR algorithm: decoding of error correcting codes defined on trellises (principally convolutional codes)

Hamming(7,4): a Hamming code that encodes 4 bits of data into 7 bits by adding 3 parity bits
Hamming distance: sum number of positions which are different
Hamming weight (population count): find the number of 1 bits in a binary word


Luhn algorithm: a method of validating identification numbers
Luhn mod N algorithm: extension of Luhn to non-numeric characters
Parity: simple/fast error detection technique

Lossless compression algorithms

Burrows–Wheeler transform: preprocessing useful for improving lossless compression
Delta encoding: aid to compression of data in which sequential data occurs frequently
Dynamic Markov compression: Compression using predictive arithmetic coding

Deflate
LempelZiv

Lempel–Ziv–Oberhumer (LZO): speed oriented
LZWL: syllable-based variant
LZX

Entropy encoding: coding scheme that assigns codes to symbols so as to match code lengths with the probabilities of the symbols

Arithmetic coding: advanced entropy coding

Range encoding: same as arithmetic coding, but looked at in a slightly different way

Huffman coding: simple lossless compression taking advantage of relative character frequencies

Adaptive Huffman coding: adaptive coding technique based on Huffman coding
Package-merge algorithm: Optimizes Huffman coding subject to a length restriction on code strings

Shannon–Fano–Elias coding: precursor to arithmetic encodingcite-ref-9[9]


Golomb coding: form of entropy coding that is optimal for alphabets following geometric distributions
Rice coding: form of entropy coding that is optimal for alphabets following geometric distributions
Unary coding: code that represents a number n with n ones followed by a zero
Universal codes: encodes positive integers into binary code words

• Elias delta, gamma, and omega coding

Fast Efficient & Lossless Image Compression System (FELICS): a lossless image compression algorithm
Incremental encoding: delta encoding applied to sequences of strings
Prediction by partial matching (PPM): an adaptive statistical data compression technique based on context modeling and prediction
Run-length encoding: lossless data compression taking advantage of strings of repeated characters
SEQUITUR algorithm: lossless compression by incremental grammar inference on a string

Lossy compression algorithms

3Dc: a lossy data compression algorithm for normal maps
Audio and Speech compression

A-law algorithm: standard companding algorithm
Code-excited linear prediction (CELP): low bit-rate speech compression
Linear predictive coding (LPC): lossy compression by representing the spectral envelope of a digital signal of speech in compressed form
Mu-law algorithm: standard analog signal compression or companding algorithm


Block Truncation Coding (BTC): a type of lossy image compression technique for greyscale images
Fast Cosine Transform algorithms (FCT algorithms): computes Discrete Cosine Transform (DCT) efficiently
Fractal compression: method used to compress images using fractals
Wavelet compression: form of data compression well suited for image compression (sometimes also video compression and audio compression)

Transform coding: type of data compression for "natural" data like audio signals or photographic images
Vector quantization: technique often used in lossy data compression

Digital signal processing

Adaptive-additive algorithm (AA algorithm): find the spatial frequency phase of an observed wave source
Discrete Fourier transform: determines the frequencies contained in a (segment of a) signal


Fast folding algorithm: an efficient algorithm for the detection of approximately periodic events within time series data
Gerchberg–Saxton algorithm: Phase retrieval algorithm for optical planes
Goertzel algorithm: identify a particular frequency component in a signal. Can be used for DTMF digit decoding.
Karplus-Strong string synthesis: physical modelling synthesis to simulate the sound of a hammered or plucked string or some types of percussion

Image processing

Adaptive histogram equalization: histogram equalization which adapts to local changes in contrast - Contrast Enhancement
Blind deconvolution: image de-blurring algorithm when point spread function is unknown.
Connected-component labeling: find and label disjoint regions


• Elser difference-map algorithm: a search algorithm for general constraint satisfaction problems. Originally used for X-Ray diffraction microscopy

Canny edge detector: detect a wide range of edges in images
Marr–Hildreth algorithm: an early edge detection algorithm
SIFT (Scale-invariant feature transform): is an algorithm to detect and describe local features in images.
• SURF (Speeded Up Robust Features): is a robust local feature detector, first presented by Herbert Bay et al. in 2006, that can be used in computer vision tasks like object recognition or 3D reconstruction. It is partly inspired by the SIFT descriptor. The standard version of SURF is several times faster than SIFT and claimed by its authors to be more robust against different image transformations than SIFT.cite-ref-10[10]cite-ref-11[11]

Histogram equalization: use histogram to improve image contrast - Contrast Enhancement
Richardson–Lucy deconvolution: image de-blurring algorithm
Seam carving: content-aware image resizing algorithm
Segmentation: partition a digital image into two or more regions

GrowCut algorithm: an interactive segmentation algorithm
Watershed transformation: a class of algorithms based on the watershed analogy

Software engineering

CHS conversion: converting between disk addressing systems
Double dabble: convert binary numbers to BCD
Hash function: convert a large, possibly variable-sized amount of data into a small datum, usually a single integer that may serve as an index into an array

Fowler–Noll–Vo hash function: fast with low collision rate
Pearson hashing: computes 8-bit value only, optimized for 8-bit computers
Zobrist hashing: used in the implementation of transposition tables

Xor swap algorithm: swaps the values of two variables without using a buffer

Database algorithms
Distributed systems algorithms



Consensus (computer science): agreeing on a single value or history among unreliable processors


• Detection of Process Termination


Lamport ordering: a partial ordering of events based on the happened-before relation
Leader election: a method for dynamically selecting a coordinator




Snapshot algorithm: record a consistent global state for an asynchronous system


Vector clocks: generate a partial ordering of events in a distributed system and detect causality violations

Memory allocation and deallocation algorithms

Buddy memory allocation: an algorithm to allocate memory such with less fragmentation

Cheney's algorithm: an improvement on the Semi-space collector
Generational garbage collector: Fast garbage collectors that segregate memory by age
• Semi-space collector: an early copying collector


Networking

Karn's algorithm: addresses the problem of getting accurate estimates of the round-trip time for messages when using TCP
Luleå algorithm: a technique for storing and searching internet routing tables efficiently

Nagle's algorithm: improve the efficiency of TCP/IP networks by coalescing packets

Operating systems algorithms

Banker's algorithm: algorithm used for deadlock avoidance
Page replacement algorithms: for selecting the victim page under low memory conditions

Adaptive replacement cache: better performance than LRU
Clock with Adaptive Replacement (CAR): a page replacement algorithm with performance comparable to adaptive replacement cache

Process synchronization
Scheduling
I/O scheduling

Disk scheduling

Elevator algorithm: Disk scheduling algorithm that works like an elevator.
Shortest seek first: Disk scheduling algorithm to reduce seek time.

See also
References

cite-note-11. "algorithm". LII / Legal Information Institute. Retrieved 2023-10-26.
cite-note-22. citerefgegenfurtner1992Gegenfurtner, Karl R. (1992-12-01). "PRAXIS: Brent's algorithm for function minimization". Behavior Research Methods, Instruments, & Computers. 24 (4): 560–564. doi:10.3758/BF03203605. ISSN 1532-5970.
cite-note-33. "richardshin.com | Floyd's Cycle Detection Algorithm". 2013-09-30. Retrieved 2023-10-26.
cite-note-44. citereftesler-g-2020Tesler, G. (2020). "Ch. 5.9: Gale-Shapley Algorithm" (PDF). mathweb.ucsd.edu. University of California San Diego. Retrieved 26 April 2025.
cite-note-55. citerefkleinbergtardos2005Kleinberg, Jon; Tardos, Éva (2005). "Algorithmn Design: 1. Stable Matching" (PDF). www.cs.princeton.edu. Pearson-Addison Wesley: Princeton University. Retrieved 26 April 2025.
cite-note-66. citerefgoel2019Goel, Ashish (21 January 2019). Ramseyer, Geo (ed.). "CS261 Winter 2018- 2019 Lecture 5: Gale-Shapley Algorith" (PDF). web.stanford.edu. Stanford University. Retrieved 26 April 2025.
cite-note-77. "Eytzinger Binary Search - Algorithmica". Retrieved 2023-04-09.
cite-note-88. "A "Sorting" algorithm". Code Golf Stack Exchange. October 30, 2018. Retrieved April 4, 2025.
cite-note-99. "Shannon-Fano-Elias Coding" (PDF). my.ece.msstate.edu. Archived from the original (PDF) on 2021-02-28. Retrieved 2023-10-11.
cite-note-1010. "Archived copy" (PDF). www.vision.ee.ethz.ch. Archived from the original (PDF) on 21 February 2007. Retrieved 13 January 2022.{{cite web}}: CS1 maint: archived copy as title (link)
cite-note-1111. "Archived copy" (PDF). Archived from the original (PDF) on 2013-10-06. Retrieved 2013-10-05.{{cite web}}: CS1 maint: archived copy as title (link)