2.47 Let = {0,1} and let B be the collection of strings that contain at least one 1 in their second half. In other words, B = {uvlue *, ve *1* and lul≥ v}. a. Give a PDA that recognizes B. b. Give a CFG that generates B.

Database System Concepts
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Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
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2.47 Let = {0,1} and let B be the collection of strings that contain at least one 1 in
Σ
their second half. In other words, B = {uv|ueΣ, ve Σ*12* and ul > lv|}.
u|
a. Give a PDA that recognizes B.
b. Give a CFG that generates B.
Transcribed Image Text:2.47 Let = {0,1} and let B be the collection of strings that contain at least one 1 in Σ their second half. In other words, B = {uv|ueΣ, ve Σ*12* and ul > lv|}. u| a. Give a PDA that recognizes B. b. Give a CFG that generates B.
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