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computer science, a hashed array tree (HAT) is a dynamic array data-structure published by Edward Sitarski in 1996, maintaining an array of separate memory
Hashed_array_tree
List data structure to which elements can be added/removed
"Hashed Array Tree: Efficient representation of Array". "Different notions of complexity". Peter Kankowski. "Dynamic arrays in C". Javadoc on ArrayList
Dynamic_array
Topics referred to by the same term
Look up hash tree in Wiktionary, the free dictionary. In computer science, hash tree may refer to: Hashed array tree Hash tree (persistent data structure)
Hash_tree
Type of data structure
Array types are often implemented by array structures; however, in some languages they may be implemented by hash tables, linked lists, search trees,
Array_(data_structure)
Data organization and storage formats
Distributed hash table Double hashing Dynamic perfect hash table Hash array mapped trie Hash list Hash table Hash tree Hash trie Koorde Prefix hash tree Rolling
List_of_data_structures
Associative array for storing key–value pairs
implementation of associative arrays, an array A of length m is partially filled with n elements, where m≥n. A key x is hashed using a hash function h to compute
Hash_table
Formatted data in computer science
version of the more general notion of a hash tree. A HAMT is an array mapped trie where the keys are first hashed to ensure an even distribution of keys
Hash_array_mapped_trie
Data structure holding key/value pairs
structures that implement associative arrays. The two major solutions to the dictionary problem are hash tables and search trees. It is sometimes also possible
Associative_array
Data structure with nodes pointing to the next node
Faster access, such as random access (direct access), is not possible. Arrays have better cache locality compared to linked lists. Linked lists are among
Linked_list
Mapping arbitrary data to fixed-size values
hashed is small enough, then one can use the data itself (reinterpreted as an integer) as the hashed value. The cost of computing this identity hash function
Hash_function
Index of articles associated with the same name
order to perform efficient lookups and updates" Hash array mapped trie Hashed array tree Merkle tree Liang, Frank Mark (June 1983). Word hy-phen-a-tion
Hash_trie
Implementation of an associative array
than implementations of AVL trees, B-trees, hash tables, or skip lists from the same time period.[needs update] The Judy array was invented by Douglas Baskins
Judy_array
Abstract data type
onto the array or linked list, with few other helper operations. The following will demonstrate both implementations using pseudocode. An array can be used
Stack_(abstract_data_type)
Hashing technique
more even redistribution of BLOBs on server failure, each server can be hashed to multiple locations on the unit circle. When a server fails, the BLOBs
Consistent_hashing
Topics referred to by the same term
Attached on Top, expansion board format for the Raspberry Pi computer. Hashed array tree, in computer programming. Help authoring tool, software for "help"
Hat_(disambiguation)
Cryptographic hash function
a 4×4 array of words. BLAKE repeatedly combines an 8-word hash value with 16 message words, truncating the ChaCha result to obtain the next hash value
BLAKE_(hash_function)
Search tree data structure
resolve mask-based operations in IP routing. Suffix tree Hash trie Hash array mapped trie Prefix hash tree Ctrie HAT-trie Aho–Corasick algorithm Maabar, Maha
Trie
Data structure
Deterministic finite automata Judy array Search algorithm Extendible hashing Hash array mapped trie Prefix hash tree Burstsort Luleå algorithm Huffman
Radix_tree
Formatted data in computer science
science, a hash tree (or hash trie) is a persistent data structure that can be used to implement sets and maps, intended to replace hash tables in purely
Hash tree (persistent data structure)
Hash_tree_(persistent_data_structure)
Topics referred to by the same term
hash table or search tree Asynchronous array of simple processors Disk array, such as the RAID Gate array, including a field-programmable gate array (FPGA)
Array
Computer communications authentication algorithm
following hash functions: SHA-1, MD5, RIPEMD-128. function hmac is input: key: Bytes // Array of bytes message: Bytes // Array of bytes to be hashed hash: Function
HMAC
Data type that represents an ordered collection of elements (values or variables)
are often implemented by array data structures, but sometimes by other means, such as hash tables, linked lists, or search trees. Heinz Rutishauser's programming
Array_(data_type)
Data structure for approximate set membership
counting Bloom filters, at each element insertion, the hashed counters are incremented by a hashed variable increment instead of a unit increment. To query
Bloom_filter
Search algorithm used in sorted arrays
unbounded lists. The binary search tree and B-tree data structures are based on binary search. Binary search works on sorted arrays. Binary search begins by comparing
Binary_search
Computer programming data structure
linearly with the size of the list. CDR coding Skip list T-tree XOR linked list Hashed array tree Shao, Z.; Reppy, J. H.; Appel, A. W. (1994), "Unrolling
Unrolled_linked_list
Tree data structure
BST or sorted array), and only the representative element (such as the minimum) of each bucket is indexed in the hash-table-based vEB tree. This preserves
Van_Emde_Boas_tree
Algorithm
performance. Several modifications to rendezvous hashing have been proposed to overcome this limitation. The Cache Array Routing Protocol (CARP) is a 1998 IETF
Rendezvous_hashing
appear in multiple comparisons (for example, a hash map can be used to implement an associative array or a set). A list or sequence is an abstract data
Comparison_of_data_structures
2015 password-based key derivation function
internally built upon Blake2. Function Hash(message, digestSize) Inputs: message: Bytes (0..232-1) Message to be hashed digestSize: Integer (1..232) Desired
Argon2
Hash function construction used in computer programs that play abstract board games
the rook at the source square) This makes Zobrist hashing very efficient for traversing a game tree. In computer Go, this technique is also used for superko
Zobrist_hashing
Any node-based binary search tree that automatically keeps its height the same
search trees provide efficient implementations for mutable ordered lists, and can be used for other abstract data structures such as associative arrays, priority
Self-balancing binary search tree
Self-balancing_binary_search_tree
Abstract data type for storing distinct values
has literal syntax for hashed sets (clojure.lang.PersistentHashSet), and also implements sorted sets (clojure.lang.PersistentTreeSet). LabVIEW has native
Set_(abstract_data_type)
Set of cryptographic hash functions
Keccak by allowing an additional d bits of input to be hashed each iteration. However, the hash functions would not have been drop-in replacements with
SHA-3
Overview of and topical guide to algorithms
structure) Binary tree Binary search tree AVL tree Red–black tree B-tree B+ tree Trie Segment tree Fenwick tree Heap (data structure) Hash table Hash function
Outline_of_algorithms
Tree containing all suffixes of a given text
efficient running time properties use hash maps, sorted or unsorted arrays (with array doubling), or balanced search trees. We are interested in: The cost of
Suffix_tree
Data structure that always preserves the previous version of itself when it is modified
modification in the array. Alternatively, one can employ the van Emde Boas tree at each node (possibly the space-efficient version using hashing) to reduce the
Persistent_data_structure
In computer science, a fusion tree is a type of tree data structure that implements an associative array on w-bit integers on a finite universe, where
Fusion_tree
Collections in Java
EnumMap, HashMap, IdentityHashMap, TreeMap and WeakHashMap. EnumMap extends AbstractMap. EnumMap has comparable speed with an ordinal-indexed array. This
Java_collections_framework
Password-based key derivation function
iterations salt: array of Bytes (16 bytes) random salt password: array of Bytes (1..72 bytes) UTF-8 encoded password Output: hash: array of Bytes (24 bytes)
Bcrypt
Algorithm for speeding up cellular automaton simulations
structure, of which the hashed quadtree is one Hash consing, which was the key strategy used in the original implementation of Hashlife. HashLife algorithm description
Hashlife
Data structure
ternary search tree is a type of trie (sometimes called a prefix tree) where nodes are arranged in a manner similar to a binary search tree, but with up
Ternary_search_tree
Rooted binary tree data structure
search trees are also a fundamental data structure used in construction of abstract data structures such as sets, multisets, and associative arrays. Searching
Binary_search_tree
Set of cryptographic hash functions
chunks, the initial hash values and round constants are extended to 64 bits, there are 80 rounds instead of 64, the message schedule array w has 80 64-bit
SHA-2
Computer science problem
same 1D array by traversing the inner loop backwards Store only non-zero values in the rows. This can be done using hash-tables instead of arrays. This
Longest_common_substring
Any algorithm which solves the search problem
efficient by specially constructed database structures, such as search trees, hash maps, and database indexes. Search algorithms can be classified based
Search_algorithm
Self-balancing binary search tree data structure
Left-leaning red–black tree AVL tree B-tree (2–3 tree, 2–3–4 tree, B+ tree, B*-tree, UB-tree) Scapegoat tree Splay tree T-tree WAVL tree GNU libavl Cormen
Red–black_tree
associative array classes: std::map (a red-black tree, equivalent to TreeMap in other languages) and std::unordered_map (a hash table, equivalent to HashMap in
Comparison of programming languages (associative array)
Comparison_of_programming_languages_(associative_array)
Cryptographic hash function
Grøstl is a cryptographic hash function submitted to the NIST hash function competition by Praveen Gauravaram, Lars Knudsen, Krystian Matusiewicz, Florian
Grøstl
Problem in computational complexity theory
model of computing or real RAM, for which hashing is not allowed. The algorithm below first sorts the input array and then tests all possible pairs in a
3SUM
Particular way of storing and organizing data in a computer
Relational databases commonly use B-tree indice for data retrieval, while compiler implementations usually use hash tables to look up identifiers. Filesystems
Data_structure
Divide and conquer sorting algorithm
works by selecting a "pivot" element from the array and partitioning the other elements into two sub-arrays, according to whether they are less than or
Quicksort
Data type in computer science
associative array is often implemented as a hash table, so these abstract types are often referred to by this preferred implementation, as a "heap" or a "hash",
Collection (abstract data type)
Collection_(abstract_data_type)
Data structure in chess programs for game state
the tree is traversed. Some of the very earliest chess programs working with extremely limited amounts of memory maintained serial lists (arrays) of the
Board representation (computer chess)
Board_representation_(computer_chess)
Collection of C++ libraries
data structures such as associative arrays, search trees, string manipulation, command-line flag processing, hash functions, pseudorandom number generation
Abseil_(C++_libraries)
Cryptographic hash function
CubeHash is a cryptographic hash function submitted to the NIST hash function competition by Daniel J. Bernstein. CubeHash has a 128 byte state, uses wide
CubeHash
Bitwise trie that uses a bitmap to denote valid child branches
presented a time and space efficient solution for tries named Array Mapped Tree (AMT). The Hash array mapped trie (HAMT) is based on AMT. The compact trie node
Bitwise_trie_with_bitmap
programming language, autovivification is the automatic creation of new arrays and hashes as required every time an undefined value is dereferenced. Perl autovivification
Autovivification
Method of a dimension reduction
to improve the variance of the previous estimate is to use an array of different hash functions si, each connected to its own counter Ci. For each i
Count_sketch
Mapping function that preserves data point locality
such as simple one dimensional arrays, binary search trees, B-trees, skip lists or (with low significant bits truncated) hash tables. The resulting ordering
Z-order_curve
Cryptographic hash function
One-zeros padding of a given bit string message. Conversion to 32-word array message blocks from the padded bit string message. Initialization of a chaining
LSH_(hash_function)
2009 password-based key derivation function
Passphrase: Bytes string of characters to be hashed Salt: Bytes string of random characters that modifies the hash to protect against Rainbow table attacks
Scrypt
Data structure which is efficient to both store in memory and query
representation techniques, including binary trees, k {\displaystyle k} -ary trees and multisets, as well as suffix trees and arrays. The basic problem is to store
Succinct_data_structure
Functional programming construct
| Tree (Black, Tree (Red, a, x, Tree (Red, b, y, c)), z, d) | Tree (Black, a, x, Tree (Red, Tree (Red, b, y, c), z, d)) | Tree (Black, a, x, Tree (Red
Pattern_matching
Computer scientist
Community Award. "Ideal Hash Trees" (2000), EPFL Technical Report "Fast Functional Lists, Hash-Lists, Deques and Variable Length Arrays" (2002), EPFL Technical
Phil_Bagwell
that uses array nodes to collect individual key–value pairs under radix nodes and hash buckets into an associative array. Unlike a simple hash table, HAT-tries
HAT-trie
JData Specification
including scalars, N-dimensional arrays, sparse/complex-valued arrays, maps, tables, hashes, linked lists, trees and graphs, and support optional data
JData
Programming language
syntax tree from another language, then compile the tree to a Csound performance runtime. There is a new built-in multi-dimensional array type. Arrays can
Csound
Family of cryptographic hash functions
In cryptography, the fast syndrome-based hash functions (FSB) are a family of cryptographic hash functions introduced in 2003 by Daniel Augot, Matthieu
Fast_syndrome-based_hash
Human-readable data serialization language
multi-line strings is inspired by HTML. Lists and hashes can contain nested lists and hashes, forming a tree structure; arbitrary graphs can be represented
YAML
Data structure in computer science
multidict or multidictionary) is a generalization of a map or associative array abstract data type in which more than one value may be associated with and
Multimap
Data structure that maps virtual addresses with physical addresses
major problem with this design is poor cache locality caused by the hash function. Tree-based designs avoid this by placing the page table entries for adjacent
Page_table
graph Grid (spatial index) Index (database), quadtree, k-d tree, UB-tree, R-tree, range tree as alternatives. J. Nievergelt, H. Hinterberger The Grid File:
Grid_file
Two-dimensional cellular automaton
not store cells as two-dimensional arrays, instead using algorithms such as Hashlife which represent patterns as a tree structure. The Game of Life has spawned
Conway's_Game_of_Life
Generic type features in C++
using TreeMap = std::map<K, V>; template <typename K, typename V> using HashMap = std::unordered_map<K, V>; // Defining StringHashMap<V> = HashMap<String
Template_(C++)
In programming, a reference which does not protect its object from garbage collection
weak reference for a link in the cycle. When one has an associative array (mapping, hash map) whose keys are (references to) objects, for example to hold
Weak_reference
algorithm that finds the position of a target value within a sorted array. binary tree A tree data structure in which each node has at most two children, which
Glossary_of_computer_science
LSM-Tree is the Sorted Array Merge Tree or SAMT. In this variation, a SAMT's component trees are called Wanna-B-trees. Each Wanna-B-tree has an associated
Quotient_filter
Rules governing the functioning of cryptocurrency
innovation. The mining process involves identifying a block that, when hashed twice with SHA-256, yields a number smaller than the given difficulty target
Bitcoin_protocol
Linked list of key-value pairs
times that can be obtained by representing an associative array as a binary search tree or as a hash table. Additionally, unless the list is regularly pruned
Association_list
Abstract data type in computer science
the priority value. The space can be reduced significantly with hashing. The Fusion tree by Fredman and Willard implements the minimum operation in O(1)
Priority_queue
Approximate distinct counting algorithm
data of the HyperLogLog is stored in an array M of m counters (or "registers") that are initialized to 0. Array M initialized from a multiset S is called
HyperLogLog
Method for data management
storing a word in the tree may require space beyond that required to store the word itself. An alternate representation is a suffix array, which is considered
Search_engine_indexing
Hardware that translates virtual addresses to physical addresses
registers allows multiple processes to share the same hash table. The 52-bit address is hashed, then used as an index into the off-chip table. There,
Memory_management_unit
Software programming optimization technique
a function object parameter) if F has no attached array values then allocate an associative array called values; attach values to F; end if; if F.values[arguments]
Memoization
search Key-sorted array; see binary search Self-balancing binary search tree Hash table Heap In this table, the asymptotic notation O(f(n)) means "not exceeding
Search_data_structure
Finite, ordered collection of items
implementations, however, sets are implemented using self-balancing binary search trees or hash tables, rather than a list. Lists also form the basis for other abstract
List_(abstract_data_type)
Data structure for query optimization in databases
tables that are parts of the cluster. A cluster can be keyed with a B-tree index or a hash table. The data block where the table record is stored is defined
Database_index
the bins are arranged in a 2D array. All the candidates are represented also as 2D arrays. The size of a candidate's array is the number of bins it intersects
Bin_(computational_geometry)
Key-value database management system
db uses hashed tables the same as the other DBM databases, but the library also can create databases based on a sorted balanced binary tree (BTREE) and
DBM_(computing)
Probabilistic data structure in computer science
table of events in a stream of data. It uses hash functions to map events to frequencies, but unlike a hash table uses only sub-linear space, at the expense
Count–min_sketch
Algorithmic problem on pairs of sequences
beforehand to precompute the hashes for the two sequences. Second, additional memory needs to be allocated for the new hashed sequences. However, in comparison
Longest_common_subsequence
Computer Scientist, Entrepreneur
and on building a full text searching system based on PAT trees (a version of suffix array). This project later culminated in another successful commercial
Gaston_Gonnet
Data structure for storing integers from a bounded domain
Like van Emde Boas trees, x-fast tries support the operations of an ordered associative array. This includes the usual associative array operations, along
X-fast_trie
Data structures that allow approximate membership queries
{\displaystyle m} positions in the array. In the beginning, all bits of the array are set to zero. To insert an element, all hash functions are calculated and
Approximate membership query filter
Approximate_membership_query_filter
Measures of how efficiently algorithms use resources
with a balanced random number generator, almost each permutation of the array is yielded in n! iterations. Computers have limited memory, so the generated
Best,_worst_and_average_case
Method in computer programming of forming higher-level object types
matters for the former but not the latter. Data structures such as arrays, linked lists, hash tables, and many others can be used to implement either of them
Object_composition
Query of largest element in a set less than an element
to solve the problem include balanced binary search trees, van Emde Boas trees, and fusion trees. In the static predecessor problem, the set of elements
Predecessor_problem
action rules for event handling, finite-domain constraint solving, arrays and hash tables, declarative loops, and tabling. First released in 1994, B-Prolog
B-Prolog
Data structure implementable in purely functional languages
such as arrays admit a destructive update, that is, an update which cannot be reversed. Once a program writes a value in some index of the array, its previous
Purely functional data structure
Purely_functional_data_structure
Online genealogy platform
the users' email addresses and hashed passwords to be compromised. MyHeritage stated that information about family trees, DNA profiles, and credit card
MyHeritage
travel, tourism, insurance
HASHED ARRAY-TREE
HASHED ARRAY-TREE
HASHED ARRAY-TREE
HASHED ARRAY-TREE
HASHED ARRAY-TREE
HASHED ARRAY-TREE
HASHED ARRAY-TREE
HASHED ARRAY-TREE
HASHED ARRAY-TREE
travel, tourism, insurance