On solving the progressive party problem as a MIP

The ‘Progressive Party Problem’ [9] has long been considered a problem intractable for branch-and-bound mixed integer solvers. Quite impressive results have been reported with constraint programming systems for this problem. As a result the problem has become a standard example in texts on constraint programming. Fortunately, there has been progress in the mixed integer programming arena: we can solve now larger and more difficult problems than ever before. Improvements in algorithmic theory, solvers, modeling environments and computer hardware created a new situation, where reported cases of unsolvable instances of MIP models need to re-examined, possibly with another outcome. In this paper we will show that we can solve the ‘Progressive Party Problem’ formulated as a large MIP problem, using standard, off-theshelf hardware and software. A simple myopic heuristic is also implemented and can solve the problem in a fraction of the time.