mirror of
https://github.com/TheAlgorithms/Python.git
synced 2024-11-30 16:31:08 +00:00
47 lines
1.2 KiB
Python
47 lines
1.2 KiB
Python
"""
|
|
This is a pure python implementation of the shell sort algorithm
|
|
|
|
For doctests run following command:
|
|
python -m doctest -v shell_sort.py
|
|
or
|
|
python3 -m doctest -v shell_sort.py
|
|
|
|
For manual testing run:
|
|
python shell_sort.py
|
|
"""
|
|
def shell_sort(collection):
|
|
"""Pure implementation of shell sort algorithm in Python
|
|
:param collection: Some mutable ordered collection with heterogeneous
|
|
comparable items inside
|
|
:return: the same collection ordered by ascending
|
|
|
|
>>> shell_sort([0, 5, 3, 2, 2])
|
|
[0, 2, 2, 3, 5]
|
|
|
|
>>> shell_sort([])
|
|
[]
|
|
|
|
>>> shell_sort([-2, -5, -45])
|
|
[-45, -5, -2]
|
|
"""
|
|
# Marcin Ciura's gap sequence
|
|
gaps = [701, 301, 132, 57, 23, 10, 4, 1]
|
|
|
|
for gap in gaps:
|
|
i = gap
|
|
while i < len(collection):
|
|
temp = collection[i]
|
|
j = i
|
|
while j >= gap and collection[j - gap] > temp:
|
|
collection[j] = collection[j - gap]
|
|
j -= gap
|
|
collection[j] = temp
|
|
i += 1
|
|
|
|
return collection
|
|
|
|
if __name__ == '__main__':
|
|
user_input = input('Enter numbers separated by a comma:\n').strip()
|
|
unsorted = [int(item) for item in user_input.split(',')]
|
|
print(shell_sort(unsorted))
|