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Commit788d95b

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added rotate_array.py (#13336)
* added rotate_array.py* [pre-commit.ci] auto fixes from pre-commit.com hooksfor more information, seehttps://pre-commit.ci* fixed issues* [pre-commit.ci] auto fixes from pre-commit.com hooksfor more information, seehttps://pre-commit.ci* fixed reverse issue* added doctests* [pre-commit.ci] auto fixes from pre-commit.com hooksfor more information, seehttps://pre-commit.ci* changed k to steps for a descriptive name* fixed non-pep---------Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
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defrotate_array(arr:list[int],steps:int)->list[int]:
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"""
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Rotates a list to the right by steps positions.
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Parameters:
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arr (List[int]): The list of integers to rotate.
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steps (int): Number of positions to rotate. Can be negative for left rotation.
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Returns:
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List[int]: Rotated list.
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Examples:
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>>> rotate_array([1, 2, 3, 4, 5], 2)
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[4, 5, 1, 2, 3]
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>>> rotate_array([1, 2, 3, 4, 5], -2)
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[3, 4, 5, 1, 2]
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>>> rotate_array([1, 2, 3, 4, 5], 7)
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[4, 5, 1, 2, 3]
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>>> rotate_array([], 3)
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[]
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"""
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n=len(arr)
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ifn==0:
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returnarr
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steps=steps%n
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ifsteps<0:
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steps+=n
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defreverse(start:int,end:int)->None:
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"""
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Reverses a portion of the list in place from index start to end.
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Parameters:
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start (int): Starting index of the portion to reverse.
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end (int): Ending index of the portion to reverse.
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Returns:
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None
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Examples:
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>>> example = [1, 2, 3, 4, 5]
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>>> def reverse_test(arr, start, end):
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... while start < end:
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... arr[start], arr[end] = arr[end], arr[start]
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... start += 1
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... end -= 1
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>>> reverse_test(example, 0, 2)
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>>> example
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[3, 2, 1, 4, 5]
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>>> reverse_test(example, 2, 4)
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>>> example
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[3, 2, 5, 4, 1]
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"""
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whilestart<end:
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arr[start],arr[end]=arr[end],arr[start]
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start+=1
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end-=1
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reverse(0,n-1)
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reverse(0,steps-1)
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reverse(steps,n-1)
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returnarr
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if__name__=="__main__":
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examples= [
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([1,2,3,4,5],2),
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([1,2,3,4,5],-2),
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([1,2,3,4,5],7),
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([],3),
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]
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forarr,stepsinexamples:
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rotated=rotate_array(arr.copy(),steps)
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print(f"Rotate{arr} by{steps}:{rotated}")

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