After a hundred year mission, Roy Manning and the crew of the Glory were looking forward to returning to Earth. Unknown to them, the Medcorians, one of the two races they met in the Pollack System, destroyed their replacement, the Star Ship Inspiration, and went through a magical machine called, the teacher, and changed Earth's history so they would never visit their planet. Follow Manning, as he tries to understand his inner feelings of an adventure that the rest of his crew doesn't remember, and solve the riddles of an Earth that was destroyed by a Roman Empire that never fell. Join Doctor...

This book constitutes the refereed post-conference proceedings of the 28th International Workshopon Combinatorial Algorithms, IWOCA 2017, held in Newcastle, NSW, Australia, in July 2017.The 30 regular papers presented in this volume together with 5 invited talks were carefully reviewed and selected from 55 submissions.