mirror of
https://github.com/TheAlgorithms/Python.git
synced 2024-12-18 09:10:16 +00:00
bfcb95b297
* fixup! Format Python code with psf/black push * Create codespell.yml * fixup! Format Python code with psf/black push
43 lines
1.7 KiB
Python
43 lines
1.7 KiB
Python
def double_sort(lst):
|
|
"""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 i decided to call it "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(lst)
|
|
for i in range(
|
|
0, int(((no_of_elements - 1) / 2) + 1)
|
|
): # we don't need to traverse to end of list as
|
|
for j in range(0, no_of_elements - 1):
|
|
if (
|
|
lst[j + 1] < lst[j]
|
|
): # applying bubble sort algorithm from left to right (or forwards)
|
|
temp = lst[j + 1]
|
|
lst[j + 1] = lst[j]
|
|
lst[j] = temp
|
|
if (
|
|
lst[no_of_elements - 1 - j] < lst[no_of_elements - 2 - j]
|
|
): # applying bubble sort algorithm from right to left (or backwards)
|
|
temp = lst[no_of_elements - 1 - j]
|
|
lst[no_of_elements - 1 - j] = lst[no_of_elements - 2 - j]
|
|
lst[no_of_elements - 2 - j] = temp
|
|
return lst
|
|
|
|
|
|
if __name__ == "__main__":
|
|
print("enter the list to be sorted")
|
|
lst = [int(x) for x in input().split()] # inputing elements of the list in one line
|
|
sorted_lst = double_sort(lst)
|
|
print("the sorted list is")
|
|
print(sorted_lst)
|