BIT_COUNT_IN_BYTE = [
    0,
    1,
    1,
    2,
    1,
    2,
    2,
    3,
    1,
    2,
    2,
    3,
    2,
    3,
    3,
    4,
    1,
    2,
    2,
    3,
    2,
    3,
    3,
    4,
    2,
    3,
    3,
    4,
    3,
    4,
    4,
    5,
    1,
    2,
    2,
    3,
    2,
    3,
    3,
    4,
    2,
    3,
    3,
    4,
    3,
    4,
    4,
    5,
    2,
    3,
    3,
    4,
    3,
    4,
    4,
    5,
    3,
    4,
    4,
    5,
    4,
    5,
    5,
    6,
    1,
    2,
    2,
    3,
    2,
    3,
    3,
    4,
    2,
    3,
    3,
    4,
    3,
    4,
    4,
    5,
    2,
    3,
    3,
    4,
    3,
    4,
    4,
    5,
    3,
    4,
    4,
    5,
    4,
    5,
    5,
    6,
    2,
    3,
    3,
    4,
    3,
    4,
    4,
    5,
    3,
    4,
    4,
    5,
    4,
    5,
    5,
    6,
    3,
    4,
    4,
    5,
    4,
    5,
    5,
    6,
    4,
    5,
    5,
    6,
    5,
    6,
    6,
    7,
    1,
    2,
    2,
    3,
    2,
    3,
    3,
    4,
    2,
    3,
    3,
    4,
    3,
    4,
    4,
    5,
    2,
    3,
    3,
    4,
    3,
    4,
    4,
    5,
    3,
    4,
    4,
    5,
    4,
    5,
    5,
    6,
    2,
    3,
    3,
    4,
    3,
    4,
    4,
    5,
    3,
    4,
    4,
    5,
    4,
    5,
    5,
    6,
    3,
    4,
    4,
    5,
    4,
    5,
    5,
    6,
    4,
    5,
    5,
    6,
    5,
    6,
    6,
    7,
    2,
    3,
    3,
    4,
    3,
    4,
    4,
    5,
    3,
    4,
    4,
    5,
    4,
    5,
    5,
    6,
    3,
    4,
    4,
    5,
    4,
    5,
    5,
    6,
    4,
    5,
    5,
    6,
    5,
    6,
    6,
    7,
    3,
    4,
    4,
    5,
    4,
    5,
    5,
    6,
    4,
    5,
    5,
    6,
    5,
    6,
    6,
    7,
    4,
    5,
    5,
    6,
    5,
    6,
    6,
    7,
    5,
    6,
    6,
    7,
    6,
    7,
    7,
    8,
]


def bit_count(bitmap: list):
    n = 0
    for i in range(0, len(bitmap)):
        bit = bitmap[i]
        if isinstance(bit, str):
            bit = ord(bit)
        n += BIT_COUNT_IN_BYTE[bit]
    return n


def bit_get(bitmap: list, position: int):
    bit = bitmap[int(position / 8)]
    if isinstance(bit, str):
        bit = ord(bit)
    return bit & (1 << (position & 7))