class Solution: def removeNthFromEnd(self , head: ListNode, n: int) -> ListNode: if not head: return None mark,mark.next,node=ListNode(0),head,self.find_node(head, n) curr=mark while curr: if curr.next==node: curr.next=curr.next.next break curr=curr.next return mark.next def find_node(self,head,n...