# Functions
输入总人数n,返回head指针的环形列表.
删除双向链表一个节点.
删除一个节点.
必须要返回一个*Node,因为如果删除头结点,那么链表就丢失了.
给链表插入一个节点.在双链表的最后加入.
给链表插入一个节点.在单链表的最后加入.
根据no的编号从小到大排序.
根据no的编号从小到大排序.
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显示链表的所有节点信息,和单链表一样.
显示链表的所以节点信息.
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PreOrder 先输出root节点,然后再输出左子树,然后再输出右子树.
# Structs
EmoLink to store Emp Link.
Emp to store employee status.
HashTable store EmoLink Slice.
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