mirror of
https://github.com/TheAlgorithms/Python.git
synced 2024-11-24 05:21:09 +00:00
9316e7c014
* flake8 --max-line-length=88
* fixup! Format Python code with psf/black push
Co-authored-by: github-actions <${GITHUB_ACTOR}@users.noreply.github.com>
41 lines
1.1 KiB
Python
41 lines
1.1 KiB
Python
"""
|
|
Python implementation of a sort algorithm.
|
|
Best Case Scenario : O(n)
|
|
Worst Case Scenario : O(n^2) because native Python functions:min, max and remove are
|
|
already O(n)
|
|
"""
|
|
|
|
|
|
def merge_sort(collection):
|
|
"""Pure implementation of the fastest merge sort algorithm in Python
|
|
|
|
:param collection: some mutable ordered collection with heterogeneous
|
|
comparable items inside
|
|
:return: a collection ordered by ascending
|
|
|
|
Examples:
|
|
>>> merge_sort([0, 5, 3, 2, 2])
|
|
[0, 2, 2, 3, 5]
|
|
|
|
>>> merge_sort([])
|
|
[]
|
|
|
|
>>> merge_sort([-2, -5, -45])
|
|
[-45, -5, -2]
|
|
"""
|
|
start, end = [], []
|
|
while len(collection) > 1:
|
|
min_one, max_one = min(collection), max(collection)
|
|
start.append(min_one)
|
|
end.append(max_one)
|
|
collection.remove(min_one)
|
|
collection.remove(max_one)
|
|
end.reverse()
|
|
return start + collection + end
|
|
|
|
|
|
if __name__ == "__main__":
|
|
user_input = input("Enter numbers separated by a comma:\n").strip()
|
|
unsorted = [int(item) for item in user_input.split(",")]
|
|
print(*merge_sort(unsorted), sep=",")
|