mirror of
https://github.com/TheAlgorithms/Python.git
synced 2024-11-24 13:31:07 +00:00
45524dd6d3
* Fix rehashing function will not call insert_data function * Fix typo * Update loop syntax instead of allocating a list Co-Authored-By: Christian Clauss <cclauss@me.com> Co-authored-by: Christian Clauss <cclauss@me.com>
43 lines
1.2 KiB
Python
43 lines
1.2 KiB
Python
#!/usr/bin/env python3
|
|
|
|
from hash_table import HashTable
|
|
from number_theory.prime_numbers import next_prime, check_prime
|
|
|
|
|
|
class DoubleHash(HashTable):
|
|
"""
|
|
Hash Table example with open addressing and Double Hash
|
|
"""
|
|
|
|
def __init__(self, *args, **kwargs):
|
|
super().__init__(*args, **kwargs)
|
|
|
|
def __hash_function_2(self, value, data):
|
|
|
|
next_prime_gt = (
|
|
next_prime(value % self.size_table)
|
|
if not check_prime(value % self.size_table)
|
|
else value % self.size_table
|
|
) # gt = bigger than
|
|
return next_prime_gt - (data % next_prime_gt)
|
|
|
|
def __hash_double_function(self, key, data, increment):
|
|
return (increment * self.__hash_function_2(key, data)) % self.size_table
|
|
|
|
def _collision_resolution(self, key, data=None):
|
|
i = 1
|
|
new_key = self.hash_function(data)
|
|
|
|
while self.values[new_key] is not None and self.values[new_key] != key:
|
|
new_key = (
|
|
self.__hash_double_function(key, data, i)
|
|
if self.balanced_factor() >= self.lim_charge
|
|
else None
|
|
)
|
|
if new_key is None:
|
|
break
|
|
else:
|
|
i += 1
|
|
|
|
return new_key
|