It was the Nag library for .net [1]. What I really wanted to use is Extreme Optimization, but couldn't get the company to buy a license. In the end I realised I

It was the Nag library for .net [1]. What I really wanted to use is Extreme Optimization, but couldn't get the company to buy a license. In the end I realised I could express the problem as a linear program and used Google OR Tools and LPSolve. [1] https://www.nag.com/numeric/dt/nagdotnet_dtw02/html/contents.html https://www.nag.com/numeric/dt/nagdotnet_dtw02/html/contents...