taivop
commented
9 years ago Start from the bulb x furthest from HB.
- If it is not correct, flip everything up to x.
Go closer to HB, rinse, repeat.
...but this approach isn't optimal if we can change a single bulb too. Additionally, there is symmetry in the problem (k slices).
https://moodle-app2.let.ethz.ch/pluginfile.php/169690/mod_resource/content/1/light_pattern.pdf