There really isn’t such a mathematical term – it was introduced at the latest Al Zimmermann’s Programming Contests and is defined in the contest rules (at azpcs.net – site should be back up around mid December January, a replacement is currently up at trdb.org ).

As I’m participating in this contest and have created some useful C++ classes to solve these types of optimisation problems I’ll be publishing them on github after cleaning them up when the contest is over (January 3rd).