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1f8a21d727
* Tighten up psf/black and flake8
* Fix some tests
* Fix some E741
* Fix some E741
* updating DIRECTORY.md
Co-authored-by: github-actions <${GITHUB_ACTOR}@users.noreply.github.com>
69 lines
1.7 KiB
Python
69 lines
1.7 KiB
Python
"""
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This is an implementation of Pigeon Hole Sort.
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For doctests run following command:
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python3 -m doctest -v pigeon_sort.py
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or
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python -m doctest -v pigeon_sort.py
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For manual testing run:
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python pigeon_sort.py
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"""
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def pigeon_sort(array):
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"""
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Implementation of pigeon hole sort algorithm
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:param array: Collection of comparable items
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:return: Collection sorted in ascending order
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>>> pigeon_sort([0, 5, 3, 2, 2])
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[0, 2, 2, 3, 5]
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>>> pigeon_sort([])
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[]
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>>> pigeon_sort([-2, -5, -45])
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[-45, -5, -2]
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"""
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if len(array) == 0:
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return array
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# Manually finds the minimum and maximum of the array.
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min = array[0]
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max = array[0]
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for i in range(len(array)):
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if array[i] < min:
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min = array[i]
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elif array[i] > max:
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max = array[i]
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# Compute the variables
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holes_range = max - min + 1
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holes = [0 for _ in range(holes_range)]
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holes_repeat = [0 for _ in range(holes_range)]
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# Make the sorting.
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for i in range(len(array)):
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index = array[i] - min
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if holes[index] != array[i]:
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holes[index] = array[i]
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holes_repeat[index] += 1
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else:
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holes_repeat[index] += 1
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# Makes the array back by replacing the numbers.
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index = 0
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for i in range(holes_range):
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while holes_repeat[i] > 0:
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array[index] = holes[i]
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index += 1
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holes_repeat[i] -= 1
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# Returns the sorted array.
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return array
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if __name__ == "__main__":
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user_input = input("Enter numbers separated by comma:\n")
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unsorted = [int(x) for x in user_input.split(",")]
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print(pigeon_sort(unsorted))
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