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Description of Double hasing #6467

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Merged
merged 5 commits into from
Oct 30, 2022
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Description of Double hasing #6467

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e0565eb
Description of DOuble hasing
silam Oct 1, 2022
9878b8f
Fix sheebang
silam Oct 2, 2022
32fc800
Update double_hash.py
cclauss Oct 30, 2022
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[pre-commit.ci] auto fixes from pre-commit.com hooks
pre-commit-ci[bot] Oct 30, 2022
3f98a7f
Update double_hash.py
cclauss Oct 30, 2022
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12 changes: 12 additions & 0 deletions data_structures/hashing/double_hash.py
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@@ -1,4 +1,16 @@
#!/usr/bin/env python3
"""
Double hashing is a collision resolving technique in Open Addressed Hash tables.
Double hashing uses the idea of applying a second hash function to key when a collision
occurs. The advantage of Double hashing is that it is one of the best form of probing,
producing a uniform distribution of records throughout a hash table. This technique
does not yield any clusters. It is one of effective method for resolving collisions.

Double hashing can be done using: (hash1(key) + i * hash2(key)) % TABLE_SIZE
Where hash1() and hash2() are hash functions and TABLE_SIZE is size of hash table.

Reference: https://en.wikipedia.org/wiki/Double_hashing#:~:text=Double%20hashing%20is%20a%20computer,data%20structure%20on%20a%20table%20.
"""
from .hash_table import HashTable
from .number_theory.prime_numbers import is_prime, next_prime

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