def index_element_map(arr):
    """Map the indices of the array to the respective elements.

    Parameters
    -----------
    arr : list(a)
        The array to process, of generic type a

    Returns
    -----------
    dict(int -> a), a dictionary corresponding the index to the element
    """
    index_to_element = {}
    for index, element in enumerate(arr):
        index_to_element[index] = element
    return index_to_element
Map the indices of the array to the respective elements.

    Parameters
    -----------
    arr : list(a)
        The array to process, of generic type a

    Returns
    -----------
    dict(int -> a), a dictionary corresponding the index to the element