Given an n-ary tree of resources arranged hierarchically. A process needs to
lock a resource node in order to use it. But a node cannot be locked if any
of its descendant or ancestor is locked. You are supposed to:
-> write the structure of node
-> write codes for

Islock()- returns true if a given node is locked and false if it is not
Lock()- locks the given node if possible and updates lock information
Unlock()- unlocks the node and updates information.
Codes should be :

Islock –O(1)
Lock()- O(log n)
unLock()- O(log n)

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