RoboZZle Forums

My final solution still doesn't use green paint and visits all cells. It has length 24 while could be shortened to 23 if F1 had sixth slot.

I have a solution which:
? doesn't use green paint;
? visits all cells including empty one;
? has length 26, too.
But it has 6 commands in F1...

I found a solution which collects all stars on a red square except the middle star, which is collected on the next go. Thus, on the last go my solution fails with two stars left on the map. So, I need to find another solution.

A tough puzzle! I don't think I would have solved it without the hints.

Since this is still unsolved, I guess I'll give a few more hints.

1) I used breadth first on this.
2) Only need to paint the corners green, no need to paint the whole red square.
3) The extra space in F1 is purely for function reuse.

Here is a much better hint puzzle for this series:
(don't read below if you don't want any hints)

http://robozzle.com/index.aspx#design/aaaaaaaaaeaeaaeae00eaa00eegeaaegeagaaaagaa02M22eaagaWaagaegeWaege00eWa00eeaeWaeaeaaaWaaaaaaayaaayXffaq,a

There are two similar tree algorithms. The most obvious one ends facing the opposite direction you start. The other one returns to the exact same position and facing when done.

I was attempting to make a series highlighting this second less obvious algorithm. But stupidly made the first two puzzles in an ambiguous way with enough space that either method could work.