mirror of
https://github.com/TheAlgorithms/Python.git
synced 2024-11-23 21:11:08 +00:00
417b7edfc3
* don't need to return list because list is mutable * Don't need to return list as list is mutable * use advantage of python in swapping * filter blank inputs from input list * minor changes * minor mistake * [pre-commit.ci] auto fixes from pre-commit.com hooks for more information, see https://pre-commit.ci * more readable * Update double_sort.py * last fixes * [pre-commit.ci] auto fixes from pre-commit.com hooks for more information, see https://pre-commit.ci * Apply suggestions from code review * [pre-commit.ci] auto fixes from pre-commit.com hooks for more information, see https://pre-commit.ci --------- Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com> Co-authored-by: Christian Clauss <cclauss@me.com>
45 lines
1.8 KiB
Python
45 lines
1.8 KiB
Python
from typing import Any
|
|
|
|
|
|
def double_sort(collection: list[Any]) -> list[Any]:
|
|
"""This sorting algorithm sorts an array using the principle of bubble sort,
|
|
but does it both from left to right and right to left.
|
|
Hence, it's called "Double sort"
|
|
:param collection: mutable ordered sequence of elements
|
|
:return: the same collection in ascending order
|
|
Examples:
|
|
>>> double_sort([-1 ,-2 ,-3 ,-4 ,-5 ,-6 ,-7])
|
|
[-7, -6, -5, -4, -3, -2, -1]
|
|
>>> double_sort([])
|
|
[]
|
|
>>> double_sort([-1 ,-2 ,-3 ,-4 ,-5 ,-6])
|
|
[-6, -5, -4, -3, -2, -1]
|
|
>>> double_sort([-3, 10, 16, -42, 29]) == sorted([-3, 10, 16, -42, 29])
|
|
True
|
|
"""
|
|
no_of_elements = len(collection)
|
|
for _ in range(
|
|
int(((no_of_elements - 1) / 2) + 1)
|
|
): # we don't need to traverse to end of list as
|
|
for j in range(no_of_elements - 1):
|
|
# apply the bubble sort algorithm from left to right (or forwards)
|
|
if collection[j + 1] < collection[j]:
|
|
collection[j], collection[j + 1] = collection[j + 1], collection[j]
|
|
# apply the bubble sort algorithm from right to left (or backwards)
|
|
if collection[no_of_elements - 1 - j] < collection[no_of_elements - 2 - j]:
|
|
(
|
|
collection[no_of_elements - 1 - j],
|
|
collection[no_of_elements - 2 - j],
|
|
) = (
|
|
collection[no_of_elements - 2 - j],
|
|
collection[no_of_elements - 1 - j],
|
|
)
|
|
return collection
|
|
|
|
|
|
if __name__ == "__main__":
|
|
# allow the user to input the elements of the list on one line
|
|
unsorted = [int(x) for x in input("Enter the list to be sorted: ").split() if x]
|
|
print("the sorted list is")
|
|
print(f"{double_sort(unsorted) = }")
|