





def    __UpperCamelCase      (    a) ->List[str]:
					if not head:
										return True
					# split the list to two parts
					lowerCamelCase__    ,		lowerCamelCase__       =       head.next, head
					while fast and fast.next:
										lowerCamelCase__       =       fast.next.next
										lowerCamelCase__       =       slow.next
					lowerCamelCase__       =       slow.next
					lowerCamelCase__       =       None  # Don't forget here! But forget still works!
					# reverse the second part
					lowerCamelCase__       =       None
					while second:
										lowerCamelCase__       =       second.next
										lowerCamelCase__       =       node
										lowerCamelCase__       =       second
										lowerCamelCase__       =       nxt
					# compare two parts
					# second part has the same or one less node
					while node:
										if node.val != head.val:
															return False
										lowerCamelCase__       =       node.next
										lowerCamelCase__       =       head.next
					return True





def    __UpperCamelCase      (    a) ->Any:
					if not head or not head.next:
										return True

					# 1. Get the midpoint (slow)
					lowerCamelCase__       =       lowerCamelCase__       =       lowerCamelCase__       =       head
					while fast and fast.next:
										lowerCamelCase__    ,		lowerCamelCase__       =       fast.next.next, slow.next

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

					# 3. Comparison
					while stack:
										if stack.pop() != cur.val:
															return False
										lowerCamelCase__       =       cur.next

					return True







def    __UpperCamelCase      (    a) ->Tuple:
					if not head or not head.next:
										return True
					lowerCamelCase__       =       {}
					lowerCamelCase__       =       0
					while head:
										if head.val in d:
															d[head.val].append(a)
										else:
															lowerCamelCase__       =       [pos]
										lowerCamelCase__       =       head.next
										pos += 1
					lowerCamelCase__       =       pos - 1
					lowerCamelCase__       =       0
					for v in d.values():
										if len(a) % 2 != 0:
															middle += 1
										else:
															lowerCamelCase__       =       0
															for i in range(0,     len(a)):
																				if v[i] + v[len(a) - 1 - step] != checksum:
																									return False
																				step += 1
										if middle > 1:
															return False
					return True








def    __UpperCamelCase      (    a,     a,     a=False) ->Dict:

					if isinstance(a,     a) and isinstance(a,     a):
										lowerCamelCase__       =       len(set_a.intersection(a))

										if alternative_union:
															lowerCamelCase__       =       len(a) + len(a)
										else:
															lowerCamelCase__       =       len(set_a.union(a))

										return intersection / union

					if isinstance(a,     (list, tuple)) and isinstance(a,     (list, tuple)):
										lowerCamelCase__       =       [element for element in set_a if element in set_b]

										if alternative_union:
															lowerCamelCase__       =       len(a) + len(a)
															return len(a) / union
										else:
															lowerCamelCase__       =       set_a + [element for element in set_b if element not in set_a]
															return len(a) / len(a)

										return len(a) / len(a)
					return None


if __name__ == "__main__":
						A_												=     {"a", "b", "c", "d", "e"}
						A_												=     {"c", "d", "e", "f", "h", "i"}
						print(jaccard_similarity(set_a, set_b))

