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Unformatted text preview: Info 372 Homework 5
Due date: Thursday April 20, at the beginning of class. Office hours: Tuesday April 18, 5 p.m., Upson Hall room 5133
1. Consider the crossword puzzle given below: Suppose we have the following words in our dictionary: laser, sails, hoses, sheet, steer, heel, hike, keel, knot, line, aft, ale, eel, lee, tie. (a) Specify the problem as a constraint satisfaction problem. (b) Give an example of pruning using arc consistency. (c) Suppose that the word in 1 Across is "hoses". Give an example of pruning using forward checking. (d) Solve the puzzle. 2. Consider the multiplication problem given below, where each "p" stands for a (possibly different) prime digit (so 2, 3, 5, 7). Formulate this problem as a CSP. Note: the problem has a unique solution corresponding to the multiplication problem 775 33. 3. Answer the following questions: (a) Define the most constrained variable heuristic. (b) Define the least constraining value heuristic. (c) Explain why is it a good heuristic to choose the variable that is most constrained, but the value that is least constraining in a CSP search. 1 2 ...
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- Spring '07