Weird, I was just talking about this earlier when someone asked for productive activity on train journeys to/from work. I used to do these problems years ago w

Weird, I was just talking about this earlier when someone asked for productive activity on train journeys to/from work. I used to do these problems years ago when I was still a student and later when commuting to London. I did as many as I could on paper before trying to program solutions. I'll have to log in sometime and finish the few I missed.