mirror of
https://github.com/TheAlgorithms/Python.git
synced 2024-12-05 02:40:16 +00:00
e1e5963812
* Code Enhancements in merge_sort.py This enhanced code includes improved variable naming, error handling for user input, and more detailed docstrings. It's now more robust and readable. * [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>
64 lines
1.7 KiB
Python
64 lines
1.7 KiB
Python
"""
|
|
This is a pure Python implementation of the merge sort algorithm.
|
|
|
|
For doctests run following command:
|
|
python -m doctest -v merge_sort.py
|
|
or
|
|
python3 -m doctest -v merge_sort.py
|
|
For manual testing run:
|
|
python merge_sort.py
|
|
"""
|
|
|
|
|
|
def merge_sort(collection: list) -> list:
|
|
"""
|
|
Sorts a list using the merge sort algorithm.
|
|
|
|
:param collection: A mutable ordered collection with comparable items.
|
|
:return: The same collection ordered in ascending order.
|
|
|
|
Time Complexity: O(n log n)
|
|
|
|
Examples:
|
|
>>> merge_sort([0, 5, 3, 2, 2])
|
|
[0, 2, 2, 3, 5]
|
|
>>> merge_sort([])
|
|
[]
|
|
>>> merge_sort([-2, -5, -45])
|
|
[-45, -5, -2]
|
|
"""
|
|
|
|
def merge(left: list, right: list) -> list:
|
|
"""
|
|
Merge two sorted lists into a single sorted list.
|
|
|
|
:param left: Left collection
|
|
:param right: Right collection
|
|
:return: Merged result
|
|
"""
|
|
result = []
|
|
while left and right:
|
|
result.append(left.pop(0) if left[0] <= right[0] else right.pop(0))
|
|
result.extend(left)
|
|
result.extend(right)
|
|
return result
|
|
|
|
if len(collection) <= 1:
|
|
return collection
|
|
mid_index = len(collection) // 2
|
|
return merge(merge_sort(collection[:mid_index]), merge_sort(collection[mid_index:]))
|
|
|
|
|
|
if __name__ == "__main__":
|
|
import doctest
|
|
|
|
doctest.testmod()
|
|
|
|
try:
|
|
user_input = input("Enter numbers separated by a comma:\n").strip()
|
|
unsorted = [int(item) for item in user_input.split(",")]
|
|
sorted_list = merge_sort(unsorted)
|
|
print(*sorted_list, sep=",")
|
|
except ValueError:
|
|
print("Invalid input. Please enter valid integers separated by commas.")
|