From the previous post: “Can you come up with a good algorithm to read a stack of triple-sided sheets of paper? You may not be familiar with triple-sided sheet

From the previous post: “Can you come up with a good algorithm to read a stack of triple-sided sheets of paper? You may not be familiar with triple-sided sheets of paper, so here’s how they work: they stack nicely, just like regular sheets of paper, but you have to flip one over three times before you get back to the original side. In particular, there are two different operations you can do: call them flip (say, left-right) and anti-flip (right-left). On two-sided paper, flip and anti-flip are the same. On three-sided sheets, two flips are the same as an anti-flip, and two anti-flips are the same as a flip. Of course, three flips, or three anti-flips, are both the same as doing nothing.”