Примери коришћења Hash tables на Енглеском и њихови преводи на Српски
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Data structures(such as lists,trees, and hash tables).
Together, these hash tables form the level-search structure(ISS).
Open addressing, or closed hashing, is a method of collision resolution in hash tables.
As is true with all hash tables, the performance is based on the largest bucket.
In this capacity, self-balancing BSTs have a number of advantages anddisadvantages over their main competitor, hash tables.
Hash tables are commonly used to implement many types of in-memory tables. .
To guarantee the worst-case query times, these hash tables should use dynamic perfect hashing or cuckoo hashing. .
One advantage of self-balancing BSTs is that they allow fast(indeed, asymptotically optimal)enumeration of the items in key order, which hash tables do not provide.
In many situations, hash tables turn out to be more efficient than search trees or any other table look-up structure.
The OS may avoid reusing segment values to delay facing this, orit may elect to suffer the waste of memory associated with per-process hash tables.
In many situations, hash tables turn out to be on average more efficient than search trees or any other table lookup structure.
A study by Zukowski et al. has shown that cuckoo hashing is much faster thanchained hashing for small, cache-resident hash tables on modern processors.
Tries tend to be faster on average at insertion than hash tables because hash tables must rebuild their index when it becomes full- a very expensive operation.
Ruby's standard library includes a set module which contains Set andSortedSet classes that implement sets using hash tables, the latter allowing iteration in sorted order.
Additionally, like hash tables this structure requires table resizings to maintain efficiency as elements are added and n becomes much larger than h2.
Lists of hashes are used for many different purposes,such as fast table lookup(hash tables) and distributed databases(distributed hash tables).
Linked lists, arrays,sets and hash tables, are available in mutable and immutable variants, with the immutable variant considered the more basic and default implementation.
Kenneth Ross has shown bucketized versions of cuckoo hashing(variants that use buckets that contain more than one key)to be faster than conventional methods also for large hash tables, when space utilization is high.
Self-balancing BSTs have better worst-case lookup performance than hash tables(O(log n) compared to O(n)), but have worse average-case performance(O(log n) compared to O(1)).
Hash tables are particularly efficient when the maximum number of entries can be predicted in advance, so that the bucket array can be allocated once with the optimum size and never resized.
Similarly, all of the collection objects(container types) in Scala, e.g. linked lists, arrays,sets and hash tables, are available in mutable and immutable variants, with the immutable variant considered the more basic and default implementation.
Associative arrays may also be stored in unbalanced binary search trees or in data structures specialized to a particular type of keys such as radix trees, tries, Judy arrays, or van Emde Boas trees, butthese implementation methods are less efficient than hash tables as well as placing greater restrictions on the types of data that they can handle.
Trie lookup can be slower in some cases than hash tables, especially if the data is directly accessed on a hard disk drive or some other secondary storage device where the random-access time is high compared to main memory.[7].
For instance, by repeatedly applying the Kirkpatrick-Reisch range reduction technique until the keys are small enough to apply the Albers-Hagerup packed sorting algorithm, it is possible to sort in time O(n log log n); however, the range reduction part of thisalgorithm requires either a large memory(proportional to√K) or randomization in the form of hash tables.
Depending on the constructs made available by the host language, a standard library may include: Subroutines Macro definitions Global variables Class definitions Templates Most standard libraries include definitions for at least the following commonly used facilities: Algorithms( such as sorting algorithms) Data structures( such as lists,trees, and hash tables) Interaction with the host platform, including input/ output and operating system calls Philosophies of standard library design vary widely.
Linear hashing allows for the expansion of the hash table one slot at a time.
In the latter case, the hash table is rebuilt in-place using new hash functions.
For example the hash table class can have the function and the procedure.
G2, G3, andearly G4 chips use hardware to search the hash table.
The OS needs to discard an entry from the hash table to make space for a new entry.