删除链表的倒数第N个节点

def solve():
    class ListNode:
        def __init__(____):
            self.val = val
            self.next = next
    
    # 创建链表 ____->____->____->____->____
    head = ListNode(____)
    head.next = ListNode(____)
    head.next.next = ListNode(____)
    head.next.next.next = ListNode(____)
    head.next.next.next.next = ListNode(____)
    
    n = ____
    dummy = ListNode(____)
    dummy.next = head
    fast = slow = dummy
    
    for _ in range(____):
        fast = fast.next
    
    while fast:
        fast = fast.next
        slow = slow.next
    
    slow.next = slow.next.next
    
    result = []
    node = dummy.next
    while node:
        result.append(str(____))
        node = node.next
    print('____'.join(____))