A Hyper-arc Consistency Algorithm for the Soft Alldifferent Constraint

This paper presents an algorithm that achieves hyper-arc consistency for the soft alldifferent constraint. To this end, we prove and exploit the equivalence with a minimum-cost flow problem. Consistency of the constraint can be checked in O(nm) time, and hyper-arc consistency is achieved in O(m) time, where n is the number of variables involved and m is the sum of the cardinalities of the domains. It improves a previous method that did not ensure hyper-arc consistency.

• Type: Conference
• Year: 2004
• Where: CP
• Authors: Willem Jan van Hoeve
• Keywords: Algorithm, Artificial Intelligence, CP 2004, Hyper-arc Consistency, Minimum-cost Flow Problem