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func copyRandomList(head *Node) *Node {
if head == nil {
return nil
}
// 第一步：在每个节点后面插入一个新节点
cur := head
for cur != nil {
newNode := &Node{Val: cur.Val, Next: cur.Next}
cur.Next = newNode
cur = newNode.Next
}
// 第二步：更新新节点的随机指针
cur = head
for cur != nil {
if cur.Random != nil {
cur.Next.Random = cur.Random.Next
}
cur = cur.Next.Next
}
// 第三步：拆分链表
cur = head
newHead := head.Next
for cur != nil {
newNode := cur.Next
cur.Next = newNode.Next
if newNode.Next != nil {
newNode.Next = newNode.Next.Next
}
cur = cur.Next
}
return newHead
}
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