Question: Implement the following methods, each of which takes as its argument a Node that is the root of a binary tree. Your methods should all

Implement the following methods, each of which takes as its argument a Node that is the root of a binary tree.

int size() int leaves () double total() number of nodes in theYour methods should all run in linear time.

int size() int leaves () double total() number of nodes in the tree number of nodes whose links are both null sum of the key values in all nodes

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