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54 lines
1.5 KiB
Python
54 lines
1.5 KiB
Python
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"""
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This is a pure Python implementation of the Cyclic Sort algorithm.
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For doctests run following command:
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python -m doctest -v cyclic_sort.py
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or
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python3 -m doctest -v cyclic_sort.py
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For manual testing run:
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python cyclic_sort.py
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"""
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def cyclic_sort(nums: list) -> list:
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"""
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Sorts the input list in-place using the Cyclic Sort algorithm.
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:param nums: List of integers to be sorted.
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:return: The same list sorted in ascending order.
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Time complexity: O(n), where n is the number of elements in the list.
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Examples:
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>>> cyclic_sort([3, 5, 2, 1, 4])
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[1, 2, 3, 4, 5]
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>>> cyclic_sort([])
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[]
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>>> cyclic_sort([-2, -5, -45])
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[-45, -5, -2]
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"""
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# Perform cyclic sort
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i = 0
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while i < len(nums):
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# Calculate the correct index for the current element
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correct_index = nums[i] - 1
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# If the current element is not at its correct position,
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# swap it with the element at its correct index
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if nums[i] != nums[correct_index]:
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nums[i], nums[correct_index] = nums[correct_index], nums[i]
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else:
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# If the current element is already in its correct position,
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# move to the next element
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i += 1
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return nums
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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 a comma:\n").strip()
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unsorted = [int(item) for item in user_input.split(",")]
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print(*cyclic_sort(unsorted), sep=",")
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