实现深拷贝函数,需要递归遍历整个嵌套的双向链表,对于每个节点进行深拷贝操作,并处理好指针指向。以下是一个示范代码:
class Node:
def __init__(self, value=None):
self.value = value
self.prev = None
self.next = None
self.child = None
def copy_node(node):
# 创建一个新节点
new_node = Node(value=node.value)
# 拷贝 child 节点
if node.child:
new_node.child = copy_list(node.child)
return new_node
def copy_list(head):
if not head:
return None
new_head = copy_node(head)
prev_node = new_head
curr_node = head.next
while curr_node:
new_node = copy_node(curr_node)
new_node.prev = prev_node
prev_node.next = new_node
# 如果存在子链表,递归拷贝
if curr_node.child:
new_node.child = copy_list(curr_node.child)
prev_node = new_node
curr_node = curr_node.next
return new_head
# 示例
a = Node(1)
b = Node(2)
c = Node(3)
d = Node(4)
e = Node(5)
f = Node(6)
g = Node(7)
a.next = b
b.next = c
b.child = f
c.next = d
c.child = g
d.next = e
new_head = copy_list(a)
上面的代码实现了一个深拷贝函数,能够正确地拷贝嵌套的双向链表,并且不依赖于任何复制库。
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