Paper by Erik D. Demaine

Erik D. Demaine, John Iacono, and Stefan Langerman, “Retroactive Data Structures”, ACM Transactions on Algorithms, volume 3, number 2, May 2007, Article 13.

We introduce a new data structuring paradigm in which operations can be performed on a data structure not only in the present but also in the past. In this new paradigm, called retroactive data structures, the historical sequence of operations performed on the data structure is not fixed. The data structure allows arbitrary insertion and deletion of operations at arbitrary times, subject only to consistency requirements. We initiate the study of retroactive data structures by formally defining the model and its variants. We prove that, unlike persistence, efficient retroactivity is not always achievable. Thus, we present efficient retroactive data structures for queues, doubly ended queues, priority queues, union-find, and decomposable search structures.

The paper is 21 pages.

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Related papers:
Retroactive_SODA2004 (Retroactive Data Structures)

See also other papers by Erik Demaine.
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Last updated March 27, 2017 by Erik Demaine.