Abstract

Integration of explanations into a CSP solver is a technique addressing difficult question why my problem has no solution. Besides providing some sort of answer to the user, explanations can be used for debugging, solving dynamic problems and in advanced search algorithms. Explanations work pretty well with simple constraints. However, in order to use explanations together with a global constraint, its filtering algorithm (i.e. propagation) has to be enhanced to be explanation-aware. In my work I focus on such a technique for classical scheduling filtering algorithms like edge-finding and not-first/not-last.

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