Papers › c-trie++: A Dynamic Trie Tailored for Fast Prefix Searches
c-trie++: A Dynamic Trie Tailored for Fast Prefix Searches
Kazuya Tsuruta, Dominik Köppl, Shunsuke Kanda, Yuto Nakashima, Shunsuke Inenaga, Hideo Bannai, Masayuki Takeda
Given a dynamic set K of k strings of total length n whose characters are drawn from an alphabet of size σ, a keyword dictionary is a data structure built on K that provides locate, prefix search, and update operations on K. Under the assumption that α= w / σ characters fit into a single machine word w, we propose a keyword dictionary that represents K in n σ+ Θ(k n) bits of space, supporting all operations in O(m / α+ α) expected time on an input string of length m in the word RAM model. This data structure is underlined with an exhaustive practical evaluation, highlighting the practical usefulness of the proposed data structure, especially for prefix searches - one of the most elementary keyword dictionary operations.
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