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### Problem_Set_03

Course: BUS CS311, Spring 2012
School: King Fahd University of...
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University ArsDigita Month 8: Theory of Computation Professor Shai Simonson Problem Set 3 1. Construct non-deterministic pushdown automata to accept the following languages. Please comment and explain your machines. a. b. c. d. {1 0 | n &gt; 0} n 2n {0 1 | n &gt;= 0} n n n 2n {1 0 | n &gt; 0} {0 1 | n &gt;= 0} (0+1)* - {ww | w in {0,1}*} (This is the complement of ww) n n 2. Construct...

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University ArsDigita Month 8: Theory of Computation Professor Shai Simonson Problem Set 3 1. Construct non-deterministic pushdown automata to accept the following languages. Please comment and explain your machines. a. b. c. d. {1 0 | n > 0} n 2n {0 1 | n >= 0} n n n 2n {1 0 | n > 0} {0 1 | n >= 0} (0+1)* - {ww | w in {0,1}*} (This is the complement of ww) n n 2. Construct Deterministic Pushdown Automata to accept the following languages. Again include comments. a. b. c. d. {10 1 | n > 0} {110 1 | n > 0}. Binary strings that contain an equal number of 0's and 1's. Binary strings with twice as many ones as zeros. Binary strings that start and end with the same symbol, and have the same number of zeros as ones. n n n 2n 3. Construct Context Free Grammars to accept the following Languages over {0,1}. Explain your grammars. e. f. g. h. i. j. (Text: 2.4 b) The language {w | w starts and ends with the same symbol}. (Text: 2.4 c) The language {w | the length of w is odd}. (Text: 2.4 d) The language {w | the length of w is odd and its middle symbol is a zero}. n n n 2n {0 1 | n > 0} {0 1 | n > 0} i j k {0 1 2 | i j or j k}. Binary strings with twice as many ones as zeros. 4. Ambiguity a. Explain why the grammar below that generates strings with an equal number of 0's and 1's is ambiguous. S A B b. 0A | 1B 0AA | 1S | 1 1BB | 0S | 0 Extra Credit: Construct an unambiguous grammar that generates the same set of strings. c. (Text: 2.21 a) Let G = (V, Sigma, R , <STMNT>) be the following grammar: <STMT> <ASSIGN> | <IF-THEN> | <IF-THEN-ELSE>|<BEGIN-END> if condition then <STMT> IF-THEN> IF-THEN-ELSE> if condition then <STMT> else <STMT> <BEGIN-END> begin <STMT-LIST> end <STMT-LIST> <STMT-LIST> <STMT> | <STMT> a := 1 <ASSIGN> = Sigma { if, condition, then, else, begin, end, a := 1 } V = {<STMT>, <IF-THEN>, <IF-THEN-ELSE>, <BEGIN-END>, <STMT-LIST>, <ASSIGN>} G is a natural looking grammar for a fragment of a programming language, but G is ambiguous. Demonstrate that G is ambiguous. d. Extra Credit: (Text: 2.21 b) Give a new unambiguous grammar for the same language. 5. Converting to Normal Form. a. Put the following grammar into Chomsky Normal Form. Show all work. S B A | AB0 | A1A B1 | BC A C A0 | CB | CA | 1B b. Convert the following grammar to an equivalent one with no unit productions and no useless symbols. Show that the original grammar had NO useless symbols. What useless symbols are there after getting rid of unit productions? S A B A | CB C|D 1B | 1 C D 0C | 0 2D | 2 6. Derivations in Chomsky Normal Form a. b. (Text: 2.19) Show that, if G is a CFG in Chomsky normal form, then for any string w in L(G) of length n >=1, exactly 2n-1 steps are required for any derivation of w. (Text: 2.20) Let G be a CFG in Chomsky normal form that contains b variables. Show that, if G generates some string using a derivation with at least 2b steps, then L(G) is infinite. 7. Two-Way PDA's A 2-way PDA is a machine that is just like a deterministic PDA except that it can move either left or right on seeing a particular symbol in a particular state. It accepts if it moves off the right end of the input in a final state. Show that the set {0n1n0n | n > 0} is accepted by a 2-way PDA. You may assume that there is a # symbol at the end of the string and a \$ symbol at the beginning to mark the end points. To draw a 2-way PDA, just add R (right) or L (left) to each transition (so each arrow now will have an input symbol, a stack symbol, a push/pop command and an L or an R). (Note that the set above is not a CFL).
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King Fahd University of Petroleum & Minerals - BUS - CS311
ArsDigita University Month 8: Theory of Computation Professor Shai Simonson Assignment 4 1. Context Free or Not Determine and prove whether each of the following languages is Context Free or not. a. b. c. d. cfw_1 0 1 0 1 0 | i,j,k &gt; 0. cfw_w#x | w is a s
King Fahd University of Petroleum & Minerals - BUS - CS311
ArsDigita University Month 8: Theory of Computation Professor Shai Simonson Problem Set 51.Short Answers: Name that LanguageFor each of the languages below, indicate the smallest complexity class that contains it. (i.e. Regular, Deterministic Context F
King Fahd University of Petroleum & Minerals - BUS - CS311
AR S D I G I TAVN I VE R S I TYMonth 8: Theory of ComputationProblem Set 1 - Prof. Shai SimonsonDFAsDraw Deterministic Finite Automata to accept the following sets of strings over :cfw_the alphabet cfw_0,1 .All strings that contain exactly 4 &quot;0&quot;s .&quot;Al
King Fahd University of Petroleum & Minerals - BUS - CS311
AR S D I G I TAVN I VE R S I TYMonth 8: Theory of ComputationProblem Set 2 - Prof. Shai SimonsonMinimizing FSM'sConsider the Finite Automaton below. Construct the smallest Deterministic Finite Automaton which accepts the same language. Finally, draw a
King Fahd University of Petroleum & Minerals - BUS - CS311
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King Fahd University of Petroleum & Minerals - BUS - CS311
AR S D I G I TAVN I VE R S I TYMonth 8: Theory of ComputationProblem Set 1 Solutions - Mike Allen and Dimitri KountourogiannisDFAs.All strings that contain exactly 4 0s .a.1.All strings ending in 1101.b.All strings containing exactly 4 0s and at l
King Fahd University of Petroleum & Minerals - BUS - CS311
AR S D I G I TAVN I VE R S I TYMonth 8: Theory of ComputationProblem Set 3 Solutions - Mike AllenNPDAsConstruct non-deterministic pushdown automata to accept the following .languages cfw_1n0n | n&gt;0 .a.1cfw_0n12n | n&gt;=0.bcfw_1n0n | n&gt;0 U cfw_0n12n
King Fahd University of Petroleum & Minerals - BUS - CS311
AR S D I G I TAVN I VE R S I TYMonth 8: Theory of ComputationProblem Set 3 Solutions - Mike AllenNPDAsConstruct non-deterministic pushdown automata to accept the following .languages cfw_1n0n | n&gt;0 .a.1cfw_0n12n | n&gt;=0.bcfw_1n0n | n&gt;0 U cfw_0n12n
King Fahd University of Petroleum & Minerals - BUS - CS311
AR S D I G I TAVN I VE R S I TYMonth 8: Theory of ComputationProblem Set 5 Solutions - Mike AllenName that Languagecfw_DCFL. cfw_0 1 0 1 | n+m = p+q and n,m,p,q &gt; 0 cfw_DCFL. cfw_0n1m0m1n | n,m &gt; 0 cfw_regular . cfw_0n1m0p1q | n,m,p,q &gt; 0 CFL. The set
King Fahd University of Petroleum & Minerals - BUS - CS311
AR S D I G I TAVN I VE R S I TYMonth 8: Theory of ComputationProblem Set 5 Solutions - Mike AllenName that Languagecfw_DCFL. cfw_0 1 0 1 | n+m = p+q and n,m,p,q &gt; 0 cfw_DCFL. cfw_0n1m0m1n | n,m &gt; 0 cfw_regular . cfw_0n1m0p1q | n,m,p,q &gt; 0 CFL. The set
King Fahd University of Petroleum & Minerals - BUS - CS311
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