Splitting Giant Subs

A submarine sandwich (or a "sub", for short) is a very long and skinny sandwich. The Chef loves to make extremely long subs that he affectionately calls "giant subs". Since a giant sub is so long, the Chef likes to place different sandwich ingredients along different sections of the sub. For instance, the first 20 cm of the sub may have a roast beef filling, the second 20 cm may have tuna, the thi