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Paper detail

Tree compression using string grammars

We study the compressed representation of a ranked tree by a (string) straight-line program (SLP) for its preorder traversal, and compare it with the well-studied representation by straight-line context free tree grammars (which are also known as tree straight-line programs or TSLPs). Although SLPs turn out to be exponentially more succinct than TSLPs, we show that many simple tree queries can still be performed efficiently on SLPs, such as computing the height and Horton-Strahler number of a tree, tree navigation, or evaluation of Boolean expressions. Other problems on tree traversals turn out to be intractable, e.g. pattern matching and evaluation of tree automata.

preprint2015arXivOpen access
Moses GanardiDanny HuckeMarkus LohreyEric Noeth
Formal Languages and Automata TheoryData Structures and Algorithms
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Moses GanardiDanny HuckeMarkus LohreyEric Noeth

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