Function reverse

data_structures/arrays/rotate_array.py:32–61

Reverses a portion of the list in place from index start to end. Parameters: start (int): Starting index of the portion to reverse. end (int): Ending index of the portion to reverse. Returns: None Examples: >>> example = [1, 2, 3, 4

(start: int, end: int)

        steps += n

    def reverse(start: int, end: int) -> None:
        """
        Reverses a portion of the list in place from index start to end.

        Parameters:
        start (int): Starting index of the portion to reverse.
        end (int): Ending index of the portion to reverse.

        Returns:
        None

        Examples:
        >>> example = [1, 2, 3, 4, 5]
        >>> def reverse_test(arr, start, end):
        ...     while start < end:
        ...         arr[start], arr[end] = arr[end], arr[start]
        ...         start += 1
        ...         end -= 1
        >>> reverse_test(example, 0, 2)
        >>> example
        [3, 2, 1, 4, 5]
        >>> reverse_test(example, 2, 4)
        >>> example
        [3, 2, 5, 4, 1]
        """

        while start < end:
            arr[start], arr[end] = arr[end], arr[start]
            start += 1
            end -= 1

    reverse(0, n - 1)
    reverse(0, steps - 1)