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Ternary Directed Acyclic Word Graphs
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Ternary Directed Acyclic Word Graphs
Satoru Miyamoto6 , Shunsuke Inenaga6, 7 , Masayuki Takeda6, 7 and Ayumi Shinohara6, 7 
| (6) |
Department of Informatics, Kyushu University 33, Fukuoka 812-8581, Japan |
| (7) |
PRESTO, Japan Science and Technology Corporation (JST), Japan |
Abstract
Given a set S of strings, a DFA accepting S offers a very time-efficient solution to the pattern matching problem over S. The key is how to implement such a DFA in the trade-off between time and space, and especially the choice of how to implement
the transitions of each state is critical. Bentley and Sedgewick proposed an effective tree structure called ternary trees. The idea of ternary trees is to ‘implant’ the process of binary search for transitions into the structure of the trees themselves.
This way the process of binary search becomes visible, and the implementation of the trees becomes quite easy. The directed acyclic word graph (DAWG) of a string w is the smallest DFA that accepts all suffixes of w, and requires only linear space. We apply the scheme of ternary trees to DAWGs, introducing a new data structure named ternary DAWGs (TDAWGs). We perform some experiments that show the efficiency of TDAWGs, compared to DAWGs in which transitions are implemented
by tables and linked lists.
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