Design a PDA (giving brief pseudocode and showing the state diagram) for each of the following languages over the input alphabet {a, b}. {w : Jw| > 3 is odd and the first symbol matches the middle symbol} [ 2b. {w : the umber of a's before the first b equals the number of a's after the last (Note: In such an input w, there may be one b or more than one b.) 2a.

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
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2.
Design a PDA (giving brief pseudocode and showing the state diagram) for each
of the following languages over the input alphabet {a, b}.
2a.
{w : Jw| 2 3 is odd and the first symbol matches the middle symbol}
[
2b. | {w : the number of a's before the first b equals the number of a's after the last b}
(Note: In such an input w, there may be one b or more than one b.)
Transcribed Image Text:2. Design a PDA (giving brief pseudocode and showing the state diagram) for each of the following languages over the input alphabet {a, b}. 2a. {w : Jw| 2 3 is odd and the first symbol matches the middle symbol} [ 2b. | {w : the number of a's before the first b equals the number of a's after the last b} (Note: In such an input w, there may be one b or more than one b.)
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