Munkres

Munkres' assignment algorithm (hungarian method)

Latest on Hackage:0.1

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BSD-3-Clause licensed by Balazs Komuves
Maintained by bkomuves (plus) hackage (at) gmail (dot) com

The Munkres algorithm solves the weighted minimum matching problem in a complete bipartite graph, in O(n^3) time. This problem is often called the 'assignment problem'. See eg. http://en.wikipedia.org/wiki/Hungarian_algorithm.