Abstract
We prove that every unambiguous context-free language can be recognized in O (log n ) time on a parallel random access machine without write conflicts (P-RAM) using a polynomial number of processors. This strengthens the result of Reif (1982 , in “Proceedings, 23rd IEEE Symp. Found. Comput.,” pp. 114–118), who proved that every deterministic context-free language can be recognized on a P-RAM in O (log n ) time.
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