𝓞(n³) implementation of the Hungarian algorithm

Copyright (C) 2011, 2014, 2020  Mattias Andrée

This program is free software. It comes without any warranty, to
the extent permitted by applicable law. You can redistribute it
and/or modify it under the terms of the Do What The Fuck You Want
To Public License, Version 2, as published by Sam Hocevar. See
http://sam.zoy.org/wtfpl/COPYING for more details.