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  1. Left Rotation
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Left Rotation

  • victor_reial
     + 0 comments

    Python best solution

    If you’re looking for solutions to the 3-month preparation kit in either Python or Rust, you can find them below: my solutions 

    def left_rotation(d, arr):
    # Time complexity: O(n)
    # Space complexity (ignoring input): O(n)
    new_array = [0] * len(arr)
    for index in range(0, len(arr)):
        new_array[(index - d) % len(arr)] = arr[index]

    return new_array


def left_rotation_in_place(d, arr):
    # Time complexity: O(n)
    # Space complexity (ignoring input): O(1)
    n = len(arr)
    start_range = 0
    end_range = d
    for index in range(0, (end_range - start_range) // 2):
        arr[index + start_range], arr[end_range - index - 1] = (
            arr[end_range - index - 1],
            arr[index + start_range],
        )

    start_range = d
    end_range = n
    for index in range(0, (end_range - start_range) // 2):
        arr[index + start_range], arr[end_range - index - 1] = (
            arr[end_range - index - 1],
            arr[index + start_range],
        )

    start_range = 0
    end_range = n
    for index in range(0, (end_range - start_range) // 2):
        arr[index + start_range], arr[end_range - index - 1] = (
            arr[end_range - index - 1],
            arr[index + start_range],
        )

    return arr