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Communications of the ACM

Communications of the ACM

A linear algorithm for copying binary trees using bounded workspace

An algorithm to copy a binary tree in linear time using bounded workspace is presented. The algorithm does not modify the original tree at any time. The copy is constructed in such a way that it can be traversed in a read-only fashion even before the copying process is complete, provided one can distinguish between the original and the copy. The traversal can be carried out in parallel with the copying.

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