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* Pyupgrade to Python 3.9
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61 lines
1.4 KiB
Python
61 lines
1.4 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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from __future__ import annotations
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def pigeon_sort(array: list[int]) -> list[int]:
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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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_min, _max = min(array), max(array)
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# Compute the variables
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holes_range = _max - _min + 1
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holes, holes_repeat = [0] * holes_range, [0] * holes_range
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# Make the sorting.
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for i in array:
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index = i - _min
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holes[index] = i
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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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import doctest
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doctest.testmod()
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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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