





"""simple docstring"""



def 						__lowercase	(  snake_case_    :    List[str]		)  ->Union[str, Any]:



    '''simple docstring'''







    if not head:
        return True
    # split the list to two parts
    __A					,			__A       :		Optional[int]							=	head.next, head
    while fast and fast.next:
        __A       :		Union[str, Any]							=	fast.next.next
        __A       :		Tuple							=	slow.next
    __A       :		Optional[int]							=	slow.next
    __A       :		Tuple							=	None  # Don't forget here! But forget still works!
    # reverse the second part
    __A       :		Optional[Any]							=	None
    while second:
        __A       :		Union[str, Any]							=	second.next
        __A       :		List[str]							=	node
        __A       :		Union[str, Any]							=	second
        __A       :		str							=	nxt
    # compare two parts
    # second part has the same or one less node
    while node:
        if node.val != head.val:
            return False
        __A       :		str							=	node.next
        __A       :		List[Any]							=	head.next
    return True







def 						__lowercase	(  snake_case_    :    List[str]		)  ->List[Any]:



    '''simple docstring'''







    if not head or not head.next:
        return True

    # 1. Get the midpoint (slow)
    __A       :		Any							=	head
    while fast and fast.next:
        __A					,			__A       :		Union[str, Any]							=	fast.next.next, slow.next

    # 2. Push the second half into the stack
    __A       :		Dict							=	[slow.val]
    while slow.next:
        __A       :		Any							=	slow.next
        stack.append(slow.val		)

    # 3. Comparison
    while stack:
        if stack.pop() != cur.val:
            return False
        __A       :		List[Any]							=	cur.next

    return True







def 						__lowercase	(  snake_case_    :    Dict		)  ->Tuple:



    '''simple docstring'''







    if not head or not head.next:
        return True
    __A       :		List[Any]							=	{}
    __A       :		Dict							=	0
    while head:
        if head.val in d:
            d[head.val].append(snake_case_		)
        else:
            __A       :		int							=	[pos]
        __A       :		List[Any]							=	head.next
        pos += 1
    __A       :		Tuple							=	pos - 1
    __A       :		Optional[int]							=	0
    for v in d.values():
        if len(snake_case_		) % 2 != 0:
            middle += 1
        else:
            __A       :		Any							=	0
            for i in range(0							,len(snake_case_		)		):
                if v[i] + v[len(snake_case_		) - 1 - step] != checksum:
                    return False
                step += 1
        if middle > 1:
            return False
    return True











"""simple docstring"""



from collections import namedtuple

a_					=     namedtuple("""from_to""", """from_ to""")

a_					=     {
    """cubicmeter""": from_to(1, 1),
    """litre""": from_to(0.001, 1000),
    """kilolitre""": from_to(1, 1),
    """gallon""": from_to(0.00454, 264.172),
    """cubicyard""": from_to(0.76455, 1.30795),
    """cubicfoot""": from_to(0.028, 35.3147),
    """cup""": from_to(0.000236588, 4226.75),
}







def 						__lowercase	(  snake_case_    :    float							,snake_case_    :    str							,snake_case_    :    str		)  ->float:



    '''simple docstring'''







    if from_type not in METRIC_CONVERSION:
        raise ValueError(
            F"""Invalid 'from_type' value: {from_type!r}  Supported values are:\n"""
            + ''', '''.join(snake_case_		)		)
    if to_type not in METRIC_CONVERSION:
        raise ValueError(
            F"""Invalid 'to_type' value: {to_type!r}.  Supported values are:\n"""
            + ''', '''.join(snake_case_		)		)
    return value * METRIC_CONVERSION[from_type].from_ * METRIC_CONVERSION[to_type].to


if __name__ == "__main__":
       import doctest

       doctest.testmod()




