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algorithm - How i can merge two binary trees

I have two binary trees and I want to merge them. My first question is that whether we can merge two binary trees and if yes how efficiently I can perform the merge operations and what are the various ways i can perform the merging operations. ..?

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1) Flatten both the trees in to sorted lists.
2) Merge the lists from what you got in 1)
3) Construct the tree out of what you got in 2)


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