4. Suppose you have been shown a new programming language that allows you to express the...
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4. Suppose you have been shown a new programming language that allows you to express the following: Any single symbol in the English alphabet set {A, B,..., Z} is expressible. These are considered strings of length 1. A special expression e also exists that denotes the empty string. We also allow an expression for the empty set of strings. Given some two expressions that can express some two subsets S and T of strings, you can form an expression that expresses its union SUT, its concatenation S T = {xy | S, y € T}. Finally, if S is a subset of strings already known to be expressible, there is a particularly powerful expressionary device that allows you to express the following (possibly infinite set of strings) which are the concatenations of an arbitrary number (zero or more) strings from S: S*= {e, 81, 81 82, 81 82 83, 8182. Sn,... n ≥ 0, all si € S}, where $1,82,... € S (they are not necessarily distinct, i.e., repetitions are allowed), and 81 82 denotes the concatenation of $1 and 82, and similarly for $182... Sn. Now suppose we are given a directed graph of n vertices, where every (directed) edge is labeled by one or more of the letters in {A, B,..., Z}. Use the idea of Dynamic Programming to show that an expression can be found in this programming language that expresses the set of all string that would lead a path from vertex 1 to vertex n. (Hint: First show that you can express the subset of such paths from any i to any j that does not pass through any vertex. Then consider all paths from i to j that pass through vertices among {1,..., k}.) 4. Suppose you have been shown a new programming language that allows you to express the following: Any single symbol in the English alphabet set {A, B,..., Z} is expressible. These are considered strings of length 1. A special expression e also exists that denotes the empty string. We also allow an expression for the empty set of strings. Given some two expressions that can express some two subsets S and T of strings, you can form an expression that expresses its union SUT, its concatenation S T = {xy | S, y € T}. Finally, if S is a subset of strings already known to be expressible, there is a particularly powerful expressionary device that allows you to express the following (possibly infinite set of strings) which are the concatenations of an arbitrary number (zero or more) strings from S: S*= {e, 81, 81 82, 81 82 83, 8182. Sn,... n ≥ 0, all si € S}, where $1,82,... € S (they are not necessarily distinct, i.e., repetitions are allowed), and 81 82 denotes the concatenation of $1 and 82, and similarly for $182... Sn. Now suppose we are given a directed graph of n vertices, where every (directed) edge is labeled by one or more of the letters in {A, B,..., Z}. Use the idea of Dynamic Programming to show that an expression can be found in this programming language that expresses the set of all string that would lead a path from vertex 1 to vertex n. (Hint: First show that you can express the subset of such paths from any i to any j that does not pass through any vertex. Then consider all paths from i to j that pass through vertices among {1,..., k}.)
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To express the subset of paths from any vertex i to any vertex j that does not pass through any vertex we can use the expressionary device mentioned in the prompt to express the concatenation of an ar... View the full answer
Related Book For
Fundamentals of human resource management
ISBN: 978-0073530468
4th edition
Authors: Raymond A. Noe, John R. Hollenbeck, Barry Gerhart, Patrick M
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