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Simpler and faster static AC$^0$ dictionaries

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http://pubman.mpdl.mpg.de/cone/persons/resource/persons44564

Hagerup,  Torben
Algorithms and Complexity, MPI for Informatics, Max Planck Society;

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1998-1-001
(Any fulltext), 10KB

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Citation

Hagerup, T.(1998). Simpler and faster static AC$^0$ dictionaries (MPI-I-1998-1-001). Saarbrücken: Max-Planck-Institut für Informatik.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0014-9A0E-5
Abstract
We consider the static dictionary problem of using $O(n)$ $w$-bit words to store $n$ $w$-bit keys for fast retrieval on a $w$-bit \ACz\ RAM, i.e., on a RAM with a word length of $w$ bits whose instruction set is arbitrary, except that each instruction must be realizable through an unbounded-fanin circuit of constant depth and $w^{O(1)}$ size, and that the instruction set must be finite and independent of the keys stored. We improve the best known upper bounds for moderate values of~$w$ relative to $n$. If ${w/{\log n}}=(\log\log n)^{O(1)}$, query time $(\log\log\log n)^{O(1)}$ is achieved, and if additionally ${w/{\log n}}\ge(\log\log n)^{1+\epsilon}$ for some fixed $\epsilon>0$, the query time is constant. For both of these special cases, the best previous upper bound was $O(\log\log n)$.