import sys class ListNode: def __init__(self,value=0,next=None): self.value=value self.next=next def parse_input(num): if not num: return None head=ListNode(num[0]) curr=head for value in num[1:]: curr.next=ListNode(value) curr=curr.next return head def reverse(head,k): pre,cur,cnt,tail=None,head,0,...