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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
The following is a '''list of well-known algorithms'''
==Automated planning==
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===Graph algorithms===
{{further
* [[Coloring algorithm]]: Graph coloring algorithm.
* [[Hopcroft–Karp algorithm]]: convert a bipartite graph to a [[maximum cardinality matching]]
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====Graph search====
{{further
* [[A* search algorithm|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)
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** [[Bogosort]]: the list is randomly shuffled until it happens to be sorted
** [[Slowsort]]
** [[Stooge sort]]
* Hybrid
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===Numerical algorithms===
{{further
====Differential equation solving====
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====Interpolation and extrapolation====
{{further
* [[Birkhoff interpolation]]: an extension of polynomial interpolation
* [[Cubic interpolation]]
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** [[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
* [[SMAWK Algorithm]]
* [[Sparse matrix]] algorithms
** [[Cuthill–McKee algorithm]]: reduce the [[bandwidth (matrix theory)|bandwidth]] of a [[symmetric sparse matrix]]
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===Geoscience===
{{further|Geoscience}}
* [[Vincenty's formulae]]: a fast algorithm to calculate the distance between two latitude/longitude points on an ellipsoid▼
* [[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===
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* [[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
** [[Variational method]]
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* [[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 simulation]]s
▲* [[Glauber dynamics]]: a method for simulating the Ising Model on a computer
===Statistics===
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** [[Expectation-maximization 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▼
*** [[Fuzzy clustering#Fuzzy c-means clustering|Fuzzy c-means]]
▲*** [[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
** [[KHOPCA clustering algorithm]]: a local clustering algorithm, which produces hierarchical multi-hop clusters in static and mobile environments.▼
** [[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 [[medoid]]s 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]]
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** [[Single-linkage clustering]]: a simple agglomerative clustering algorithm
** [[SUBCLU]]: a subspace clustering algorithm
** [[Ward's method]]: an agglomerative clustering algorithm, extended to more general Lance–Williams algorithms▼
** [[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
* [[Estimation theory|Estimation Theory]]
** [[Expectation-maximization algorithm]] A class of related algorithms for finding maximum likelihood estimates of parameters in probabilistic models
*** [[Ordered subset expectation maximization]] (OSEM): used in [[medical imaging]] for [[positron emission tomography]], [[single-photon emission computed tomography]] and [[X-ray]] computed tomography.
** [[Odds algorithm]] (Bruss algorithm) Optimal online search for distinguished value in sequential random input▼
** [[Kalman filter]]: estimate the state of a linear [[Dynamical system|dynamic system]] from a series of noisy measurements
▲** [[Odds algorithm]] (Bruss algorithm) Optimal online search for distinguished value in sequential random input
* [[False nearest neighbor algorithm]] (FNN) estimates [[fractal dimension]]
* [[Hidden Markov model]]
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===Computer graphics===
{{further|Computer graphics}}
* [[Binary space partitioning]]▼
* [[Clipping (computer graphics)|Clipping]]
** [[Line clipping]]
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* [[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
▲* [[Binary space partitioning]]
===Cryptography===
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** [[Elliptic-curve Diffie–Hellman]] (ECDH)
* [[Key derivation function]]s, often used for [[password hashing]] and [[key stretching]]
** [[Argon2]]▼
** [[bcrypt]]
** [[PBKDF2]]
** [[scrypt]]
▲** [[Argon2]]
* [[Message authentication code]]s (symmetric authentication algorithms, which take a key as a parameter):
** [[keyed-hash message authentication code|HMAC]]: keyed-hash message authentication
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** [[Advanced Encryption Standard]] (AES), winner of [[NIST]] competition, also known as [[Rijndael]]
** [[Blowfish (cipher)|Blowfish]]
** [[Salsa20#ChaCha variant|ChaCha20]] updated variant of Salsa20
** [[Twofish]]▼
** [[Threefish]]▼
** [[Data Encryption Standard]] (DES), sometimes DE Algorithm, winner of NBS selection competition, replaced by AES for most purposes
** [[International Data Encryption Algorithm|IDEA]]
** [[RC4 (cipher)]]
** [[Salsa20]]
▲** [[Threefish]]
** [[Tiny Encryption Algorithm]] (TEA)
▲** [[Twofish]]
* [[Post-quantum cryptography]]
* [[Proof-of-work system|Proof-of-work algorithms]]
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===Digital logic===
* Boolean minimization
** [[Quine–McCluskey algorithm]]: also called as Q-M algorithm, programmable method for simplifying the Boolean equations▼
** [[Petrick's method]]: another algorithm for Boolean simplification▼
** [[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===
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** [[LPBoost]]: [[linear programming]] boosting
* [[Bootstrap aggregating]] (bagging): technique to improve stability and classification accuracy
* [[Cluster analysis|Clustering]]: a class of [[unsupervised learning]] algorithms for grouping and bucketing related input vector▼
* [[Computer Vision]]
** [[Grabcut]] based on [[Graph cuts in computer vision|Graph cuts]]
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** [[C4.5 algorithm]]: an extension to ID3
** [[ID3 algorithm]] (Iterative Dichotomiser 3): use heuristic to generate small decision trees
▲* [[Cluster analysis|Clustering]]: a class of [[unsupervised learning]] algorithms for grouping and bucketing related input vector
* [[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
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* [[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(n<sup>3</sup>) in worst case.
* [[Inside-outside algorithm]]: an O(n<sup>3</sup>) algorithm for re-estimating production probabilities in [[probabilistic context-free grammar]]s
* [[Lexical analysis]]▼
* [[LL parser]]: a relatively simple [[linear time]] parsing algorithm for a limited class of [[context-free grammar]]s
* [[LR parser]]: A more complex [[linear time]] parsing algorithm for a larger class of [[context-free grammar]]s. Variants:
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** [[Look-ahead LR parser|LALR (look-ahead LR) parser]]
** [[Operator-precedence parser]]
** [[Simple LR
** [[Simple precedence parser]]
* [[Packrat parser]]: a [[linear time]] parsing algorithm supporting some [[context-free grammar]]s and [[parsing expression grammar]]s
* [[Pratt parser]]▼
* [[Recursive descent parser]]: a [[top-down parsing|top-down parser]] suitable for LL(''k'') grammars
* [[Shunting-yard algorithm]]: converts an infix-notation math expression to postfix
▲* [[Pratt parser]]
▲* [[Lexical analysis]]
===Quantum algorithms===
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** [[Byte pair encoding]] (BPE)
** [[Deflate]]
** [[Abraham Lempel|Lempel]]–[[Jacob Ziv|Ziv]]
** [[Lempel–Ziv]]▼
*** [[LZ77 and LZ78]]
*** [[LZJB|Lempel–Ziv Jeff Bonwick]] (LZJB)
*** [[Lempel–Ziv–Markov chain algorithm]] (LZMA)
*** [[Lempel–Ziv–Oberhumer]] (LZO): speed oriented
▲*** [[LZRW|Lempel–Ziv Ross Williams]] (LZRW)
*** [[Lempel–Ziv–Stac]] (LZS)
*** [[Lempel–Ziv–Storer–Szymanski]] (LZSS)
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*** [[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
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** [[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
* [[Video compression]]▼
* [[Vector quantization]]: technique often used in lossy data compression
▲* [[Video compression]]
===Digital signal processing===
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====Image processing====
{{further|Digital image processing}}
* [[Blind deconvolution]]: image de-blurring algorithm when [[point spread function]] is unknown.▼
* [[Connected-component labeling]]: find and label disjoint regions
* [[Dithering]] and [[half-toning]]
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** [[Scale-invariant feature transform|SIFT]] (Scale-invariant feature transform): is an algorithm to detect and describe local features in images.
** {{visible anchor|SURF ([[speeded up robust features|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.<ref>{{cite web |url=http://www.vision.ee.ethz.ch/~surf/eccv06.pdf |title=Archived copy |website=www.vision.ee.ethz.ch |access-date=13 January 2022 |archive-url=https://web.archive.org/web/20070221214147/http://www.vision.ee.ethz.ch/~surf/eccv06.pdf |archive-date=21 February 2007 |url-status=dead}}</ref><ref>{{cite web |url=http://glorfindel.mavrinac.com/~aaron/school/pdf/bay06_surf.pdf |title=Archived copy |access-date=2013-10-05 |url-status=dead |archive-url=https://web.archive.org/web/20131006113018/http://glorfindel.mavrinac.com/~aaron/school/pdf/bay06_surf.pdf |archive-date=2013-10-06 }}</ref>
* [[Histogram equalization]]: use histogram to improve image contrast - Contrast Enhancement
* [[Richardson–Lucy deconvolution]]: image de-blurring algorithm
▲* [[Blind deconvolution]]: image de-blurring algorithm when [[point spread function]] is unknown.
* [[Median filtering]]
* [[Seam carving]]: content-aware image resizing algorithm
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===Process synchronization===
{{further|Process scheduler|Process synchronization}}
* [[Dekker's algorithm]]
* [[Lamport's Bakery algorithm]]
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