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Clone a given binary tree

Cloning a given binary tree means creating an exact copy of the original binary tree. The new tree should have the same structure and the same values in each node as the original tree.

Clone a binary tree

This process involves traversing the original tree and creating a new tree with the same structure and node values. This new tree will be a separate and independent tree from the original, but it will contain the same data.

Cloning a binary tree can be useful in many scenarios, such as when you want to manipulate a copy of the original tree without affecting the original, or when you want to create a backup of the original tree.

How to build a new tree using given tree in O(n) time.

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