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dc415ec14a
* double linear search recursion
* fixup! Format Python code with psf/black push
Co-authored-by: github-actions <${GITHUB_ACTOR}@users.noreply.github.com>
36 lines
911 B
Python
36 lines
911 B
Python
def search(list_data: list, key: int, left: int = 0, right: int = 0) -> int:
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"""
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Iterate through the array to find the index of key using recursion.
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:param list_data: the list to be searched
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:param key: the key to be searched
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:param left: the index of first element
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:param right: the index of last element
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:return: the index of key value if found, -1 otherwise.
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>>> search(list(range(0, 11)), 5)
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5
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>>> search([1, 2, 4, 5, 3], 4)
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2
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>>> search([1, 2, 4, 5, 3], 6)
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-1
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>>> search([5], 5)
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0
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>>> search([], 1)
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-1
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"""
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right = right or len(list_data) - 1
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if left > right:
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return -1
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elif list_data[left] == key:
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return left
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elif list_data[right] == key:
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return right
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else:
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return search(list_data, key, left + 1, right - 1)
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if __name__ == "__main__":
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import doctest
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doctest.testmod()
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