1996
Martin Henz
This paper is about how to solve a class of puzzles, called self-referential quizzes (srq), with constraint programming. An srq is a sequence of multiple choice questions that are about the puzzle itself. srqs are an attractive pastime, when they provide the possibility of drawing non-trivial conclusions on the way to the solution.
We introduce a typical srq, and represent it as a propositional satisfiability problem. Its straightforward clausal representation is too big for effective treatment using standard methods. Instead, we solve it with finite domain constraint programming. For this application of constraint programming, support of logic connectives such as conjunction and disjunction is crucial. With their small problem descriptions, \srq s are ideal candidates for benchmarks covering the implementation of 0/1 variables in constraint programming languages.
Proceedings of the Workshop on Constraint Programming Applications, in conjunction with the Second International Conference on Principles and Practice of Constraint Programming (CP96), Aug 1996