删除链表的倒数第N个节点

class ListNode:
    def __init__(____):
        self.val = val
        self.next = next

def solve():
    def removeNthFromEnd(____):
        dummy = ListNode(____, head)
        fast = slow = dummy
        for _ in range(____):
            fast = fast.next
        while fast.next:
            fast = fast.next
            slow = slow.next
        slow.next = slow.next.next
        return dummy.next
    head = ListNode(____, ListNode(____, ListNode(____, ListNode(____, ListNode(____)))))
    result = removeNthFromEnd(____)
    vals = []
    while result:
        vals.append(____)
        result = result.next
    print(____)