刀大师 店面

Implement an in-memory tree key value store.
Definitions:
path is a / separate string describing the node. Example /animals/dogs/german_shepard
Values are all strings
API:
get(path): String -> returns the value of a the node at the given path
set(path, value) -> changes the value of a given node to the new value. Should error out if the path does not currently exist
create(path, value) -> creates a new node and sets it to the given value. Should error out if the node

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he path of the node that was modified, NOT necessarily the path of the node that was watch’d (unless that happens to be the node modified). If a node is being created old_value is null, if a node is being deleted new_value is null.
Follow up 没写出来，时间不够。题目也没太懂。但是店面过了。

请问call back那个怎么做。。

这不就是zookeeper么

想问一下楼主 delete 需要recursively delete 吗