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Thread for puzzle Reversed instructions. Hints are OK, but please no full solutions.

 

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jing, 21 months ago.

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jing, 21 months ago.

No function calls itself

tsachyg's comment after solving the puzzle, 89 months ago.

nasty trick on the first green...

realarty's comment after solving the puzzle, 96 months ago.

There are dozens of ways to solve this puzzle, but I see two simple ways to get fewer than 12 commands. It is possible to solve this puzzle by stacking right on blues and left on reds or vise-versa. It is also possible to get an 11-command solution in both of these cases. However, when stacking right on blues, you can make use of the fact that the robot must follow that sequence of commands twice (R U U). One of these will be accomplished by the stacking on the last blue tile, and one by calling that stack when encountering the first green.
Effectively, you must call the commands stacked on blue when you encounter the first green, and then pop the stack.

The second way is to make use of the fact that on blue and red you stack similar commands. This is extremely useful when optimizing most stack puzzles because you can shorten your program if you can stack those commands unconditionally (on both colors), that way you don't have to place them twice. In this puzzle, you have to stack two forwards on both blue and red. If you stacked a forward command (or two) on both colors in F1, and then used F2 and F3 to stack the necessary turn commands for each of red and blue, then you've saved a command!
The nine-command solution makes use of being able to stack the double forward unconditionally.

sticky, 110 months ago.

Very curious about the optimizations : I want to understand and learn it...

garfke, 110 months ago.

How did i miss that, it seems obvious now :-) Nice find. My previous hint is good enough for this solution too.

keba, 123 months ago.

Nice! ;-) It doesn't happen that often that a shortee solution is found for an old puzzle like tihs.

igoro, 123 months ago.

New shortest solution!
Huzzah!

sticky, 123 months ago.

The shortest solution has two optimisations to reuse commands: the right turn and the double forward.

keba, 123 months ago.

really curious about the shortest solution

plissken's comment after solving the puzzle, 123 months ago.

cool stack puzzle

zenon, 124 months ago.

Classic "popping a stack" exercise - took me a while to get the program right

arkangelsk1's comment after solving the puzzle, 126 months ago.

So cool! Well conceived and executed.

dogsonofawolf's comment after solving the puzzle, 128 months ago.

Never thought I would solve this so quickly. Great puzzle!

ithilhir's comment after solving the puzzle, 129 months ago.

very cool

ngorski's comment after solving the puzzle, 132 months ago.

nice...

abhishikt's comment after solving the puzzle, 133 months ago.

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